Papers |  Reviews



  1. Control of major carriers in ambipolar polymer semiconductor by self-assembled monolayers, M. Nakano, I. Osaka, K. Takimiya, Adv. Mater., 29, 1602893 (2017).
  2. Effects of branching position of alkyl side chains on ordering structure and charge transport property in thienothiophenedione- and quinacridone-based semiconducting polymers, K. Kawabata, M. Saito, N. Takemura, I. Osaka, K. Takimiya, Polymer J., 49, 169-176 (2017).
  3. Effects of Selenium Atoms on [1]Benzochalcogenopheno[3,2-b][1]benzochalcogenophene-based Organic Semiconductors, H. Sugino, K. Takimiya, Chem. Lett., 46, 345-347 (2017).
    This paper is dedicated to the memory of Professor Yoshihito Kunugi.
  4. Naphthodithiophenediimide-Benzobisthiadiazole-Based Polymers: Versatile n-Type Materials for Field-Effect Transistors and Thermoelectric Devices, Y. Wang, M. Nakano, T. Michinobu, Y. Kiyota, T. Mori, K. Takimiya, Macromolecules, 50, 857-864 (2017).
  5. Dithienyl Acenedithiophenediones as New pi-Extended Quinoidal Cores: Synthesis and Properties, K. Kawabata, I. Osaka, M. Sawamoto, J. L. Zafra, P. Mayorga Burrezo, J. Casado, K. Takimiya, Chem. Eur. J., in press (DOI: 10.1002/chem.201605104).
    This paper is selected for inside cover.
  6. Selective thionation of naphtho[2,3-b]thiophene diimide: Tuning of the optoelectronic properties and packing structure, W. Chen, M. Nakano, K. Takimiya, Q. Zhang, Org. Chem. Front., accepted (DOI: 10.1039/C6QO00871B)
  7. High-performance solution-processed organic thin-film transistors based on a soluble DNTT derivative, M. Sawamoto, H. Sugino, M. Nakano, K. Takimiya, Org. Electron., in press (DOI: 10.1016/j.orgel.2017.04.001)


  1. Naphthodithiophene Diimide-Based Copolymers: Ambipolar Semiconductors in Field-Effect Transistors and Electron Acceptors with Near-Infrared Response in Polymer Blend Solar Cells, K. Nakano, M. Nakano, B. Xiao, E. Zhou, K. Suzuki, I. Osaka, K. Takimiya, K. Tajima Macromolecules, 49, 1752-1760 (2016).
  2. This is a collaboration work with Dr. Tajima's group.

  3. Soluble Dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene Derivatives for Solution-Processed Organic Field-Effect Transistors, M. Sawamoto, M. J. Kang, E. Miyazaki, H. Sugino, I. Osaka, K. Takimiya, ACS Appl. Mater. Interfaces, 8, 3810-3824 (2016).
  4. Amide-bridged terphenyl and dithienylbenzene units for semiconducting polymers, M. Akita, M. Saito, I. Osaka, T. Koganezawa, K. Takimiya, RSC Adv., 6, 16437-16447 (2016).
  5. Very Small Bandgap π-Conjugated Polymers with Extended Thienoquinoids, K. Kawabata, M. Saito, I. Osaka, K. Takimiya, J. Am. Chem. Soc., 138, 7725-7732 (2016).
  6. Dithienylthienothiophenebisimide, a Versatile Electron-Deficient Unit for Semiconducting Polymers, M. Saito, M. Suda, H. Yoshida, I. Osaka, K. Takimiya, Adv. Mater., 28 , 6921-6925 (2016).
  7. N,N'-Unsubstituted Naphthodithiophene Diimide (NDTI): Synthesis and Derivatization via N-Alkylation and -Arylation, M. Nakano, M. Sawamoto, M. Yuki, K. Takimiya, Org. Lett., 18, 3770-3773 (2016).
  8. N,N'-Bis(2-cyclohexylethyl)naphtho[2,3-b:6,7-b']dithiophene diimides: Effects of Substituents, M. Nakano, D. Hashizume, K. Takimiya, Molecules, 21, 981 (2016).
  9. Implication of Fluorine Atom on Electronic Properties, Ordering Structures, and Photovoltaic Performance in Naphthobisthiadiazole-Based Semiconducting Polymers, K. Kawashima, T. Fukuhara, Y. Suda, Y. Suzuki, T. Koganezawa, H. Yoshida, H. Ohkita, I. Osaka, K. Takimiya, J. Am. Chem. Soc., 138, 10265-10275 (2016).
  10. Naphtho[2,3-b]thiophene Diimide (NTI): a Mono-Functionalizable Core-Extended Naphthalene Diimide Building Block for Electron-Deficient Architectures, W. Chen, M. Nakano, J.-H. Kim, K. Takimiya, Q. Zhang, J. Mater. Chem. C., 4, 8879-8883 (2016).
  11. Reversible Dimerization & Polymerization of a Janus Diradical Producing Labile CC Bonds and Giant Chromism, J. L. Zafra, L. Qiu, N. Yanai, T. Mori, M. Nakano, M. P. Alvarez, J. T. Lopez Navarrete, C. J. Gomez-Garcia, M. Kertesz, K. Takimiya, J. Casado, Angew. Chem. Int. Ed., 55, 14563-14568 (2016).


  1. Thermally, Operationally, and Environmentally Stable Organic Thin-Film Transistors Based on Bis[1]benzothieno[2,3-d:2′,3′-d′]naphtho[2,3-b:6,7-b′]dithiophene Derivatives: Effective Synthesis, Electronic Structures, and Structure-Property Relationship, M. Abe, T. Mori, I. Osaka, K. Sugimoto, K. Takimiya, Chem. Mater, 27, 5049-5057 (2015).
  2. Thienothiophene-2,5-dione-Based Donor-Acceptor Polymers: Improved Synthesis and Infl uence of the Donor Units on Ambipolar Charge Transport Properties, K. Kawabata, I. Osaka, M. Nakano, N. Takemura, T. Koganezawa, K. Takimiya, Adv. Electron. Mater.,1,150039 (2015).
  3. Dibenzo[a,e]pentalene-Embedded Dicyanomethylene-Substituted Thienoquinoidals for n-Channel Organic Semiconductors: Synthesis, Properties, and Device Characteristics, M. Nakano, I. Osaka, K. Takimiya, J. Mater. Chem. C, 3, 283-290 (2015).
  4. Efficient inverted polymer solar cells employing favourable molecular orientation, V. Vohra, K. Kawashima, T. Kakara, T. Koganezawa, I. Osaka, K. Takimiya, H. Murata, Nat. Photon.,9, 403-408 (2015).
  5. Naphthodithiophene Diimide (NDTI)-Based Semiconducting Copolymers: From Ambipolar to Unipolar n-Type Polymers, M. Nakano, I. Osaka, K. Takimiya, Macromolecules, 48, 576-584 (2015).
  6. Naphthodithiophenediimide (NDTI)-based triads for high-performance air-stable, solution-processed ambipolar organic field-effect transistors : J.-Y. Hu, M. Nakano, I. Osaka, K. Takimiya, J. Mater. Chem. C, 3, 4244-4249 (2015).
  7. alpha-Modified naphthodithiophene diimides; molecular design strategy for air-stable n-channel organic semiconductors, M. Nakano, I. Osaka, D. Hashizume, K. Takimiya, Chem. Mater., 27, 6418-6425 (2015).
  8. Highly Efficient and Stable Solar Cells Based on Thiazolothiazole and Naphthobisthiadiazole Copolymers, M. Saito, I. Osaka, Y. Suzuki, K. Takimiya, T. Okabe, S. Ikeda, T. Asano, Sci. Rep., 5, 14202 (2015).
  9. Effect of Chalcogen Atom on the Properties of Naphthobischalcogenadiazole-Based-Conjugated Polymers, K. Kawashima, I. Osaka, K. Takimiya, Chem. Mater., 27, 6558-6570 (2015).
  10. Single-Crystal-Like Organic Thin-Film Transistors Fabricated from Dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) Precursor-Polystyrene Blends, A. Hamaguchi, T. Negishi, Y. Kimura, Y. Ikeda, K. Takimiya, S. Z. Bisri, Y. Iwasa, T. Shiro, Adv. Mater., 27, 6606-6611 (2015).
  11. High-Efficiency Polymer Solar Cells with Small Photon Energy Loss, I. Osaka, K. Kawashima, Y. Tamai, H. Ohkita, K. Takimiya, Nat. Commun., 6, 10085 (2015).


  1. Novel dibenzo[a,e]pentalene-based conjugated polymers, M. Nakano, I. Osaka, K. Takimiya, T. Koganezawa, J. Mater. Chem. C, 2, 64-70 (2014).
  2. Dithiophene-fused Tetracyanonaphthoquinodimethanes (DT-TNAPs): Synthesis and Characterization of π-Extended Quinoidal Compounds for n-Channel Organic Semiconductor, N. Yanai, T. Mori, S. Shinamura, I. Osaka, K. Takimiya, Org. Lett., 16, 240-243 (2014).
  3. Thiophene-Thiazolothiazole Copolymers: Significant Impact of Side Chain Composition on Polymer Orientation and Solar Cell Performances, I. Osaka, M. Saito, T. Koganezawa, K. Takimiya, Adv. Mater. 26, 331-338 (2014).
  4. Small Band Gap Polymers Incorporating a Strong Acceptor, Thieno[3,2-b]thiophene-2,5-dione, with P-Channel and Ambipolar Charge Transport Characteristics, I. Osaka, T. Abe, H. Mori, M. Saito, N. Takemura, T. Koganezawa, K. Takimiya, J. Mater. Chem. C, 2, 2307-2312 (2014)
  5. Quinoidal Naphtho[1,2-b:5,6-b']dithiophenes (QNDT-CNs) for Solution-Processed n-Channel Organic Field-Effect Transistors, T Mori, N Yana, I Osaka, K Takimiya, Org. Lett. 16, 1334-1337 (2014).
  6. 5,10-linked naphthodithiophenes as the building block for semiconducting polymers, I. Osaka, K. Komatsu, T. Koganezawa, K. Takimiya, Sci. Technol. Adv. Mater. 15, 024201 (2014).
  7. Contrasting Effect of Alkylation on The Ordering Structure in Isomeric Naphthodithiophene-Based Polymers, I. Osaka, Y. Houchin, M. Yamashita, T. Kakara, N.Takemura, T. Koganezawa, K. Takimiya, Macromolecules, 47, 3502-3510 (2014).
  8. All-Polymer Solar Cell with High Near-Infrared Response Based on a Naphthodithiophene Diimide (NDTI) Copolymer, E. Zhou, M. Nakano, S. Izawa, J. Cong, I. Osaka, K. Takimiya, K. Tajima, ACS Macro Lett. 3, 872-875 (2014).
  9. Effect of Oxygen Containing Functional Side Chains on the Electronic Properties and Photovoltaic Performances in a Thiophene-Thiazolothiazole Copolymer System, M. Saito, I. Osaka, K. Takimiya, Heteroatom Chem., 25, 556-564 (2014).


  1. Diphenyl Derivatives of Dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene: Organic Semiconductors for Thermally Stable Thin-film Transistors, M. J. Kang, E. Miyazaki, I. Osaka, K Takimiya, A. Nakao, ACS Appl. Mater. Interfaces, 5, 2331-2336 (2013).
  2. Quinacridone-Diketopyrrolopyrrole-Based Polymers for Organic Field-Effect Transistors, M. Akita, I. Osaka, K Takimiya, MATERIALS, 6, 1061-1071 (2013).
  3. 5,10-Diborylated naphtho[1,2-c:5,6-c']bis[1,2,5]-thiadiazole: a ready-to-use precursor for the synthesis of high-performance semiconducting polymers, K. Kawashima, E. Miyazaki, M. Shimawaki, Y. Inoue, H. Mori, I. Osaka, K. Takimiya, Polym. Chem., 4, 5224-5227 (2013).
  4. Naphthodithiophene-Naphthobisthiadiazole Copolymers for Solar Cells: Alkylation Drives the Polymer Backbone Flat and Promotes Efficiency, I. Osaka, T. Kakara, N. Takemura, T. Koganezawa, and K. Takimiya, J. Am .Chem. Soc., 135, 8834-8837 (2013).
  5. Naphthodithiophenediimide (NDTI): Synthesis, Structure, and Applications, Y. Fukutomi, M. Nakano, J.-Y. Hu, I. Osaka, K. Takimiya, J. Am .Chem. Soc., 135, 11445-11448 (2013)
  6. Consecutive thiophene-annulation approach to π-extended thienoacene-based organic semiconductors with [1]benzothieno[3,2-b][1]benzothiophene (BTBT) substructure, T. Mori, T. Nishimura, T. Yamamoto, I. Doi, E. Miyazaki, I. Osaka, K. Takimiya, J. Am .Chem. Soc., 135, 13900-13913 (2013).


  1. Naphtho[2,3-b:6,7-b']dichalcogenophenes: syntheses, characterizations, and chalcogene atom effects on OFET and OPV devices, M. Nakano, H. Mori, S. Shinamura, K. Takimiya, Chem. Mater., 24, 190-198 (2012).
  2. Drastic Change of Molecular Orientation in a Thiazolothiazole Copolymer by Molecular-Weight Control and Blending with PC61BM Leads to High Efficiencies in Solar Cells, I. Osaka, M. Saito, H. Mori, T. Koganezawa, K. Takimiya, Adv. Mater., 24, 425-430 (2012).
  3. Synthesis, Characterization, and Transistor and Solar Cell Applications of A Naphthobisthiadiazole-Based Semiconducting Polymer, I. Osaka, M. Shimawaki, H. Mori, I. Doi, E. Miyazaki, T. Koganezawa, K. Takimiya, J. Am .Chem. Soc., 134, 3498-3507.
  4. High Mobility Organic Thin-Film Transistors on Plastic Substrate, I. Doi, M. J. Kang, K. Takimiya, Curr. Appl. Phys., 12, Supplement 1, e2-e5 (2012)
  5. Quinacridone-Based Semiconducting Polymers; Implication of Electronic Structure and Orientational Order for Charge Transport Property, I. Osaka, M. Akita, T. Koganezawa, K. Takimiya, Chem. Mater., 24, 1235-1243 (2012).
  6. Naphthodithiophene-Based Donor-Acceptor Polymers: Versatile Semiconductors for OFETs and OPVs, I. Osaka, T. Abe, M. Shimawaki, T. Koganezawa, K. Takimiya, ACS Macro Lett. 1, 437-440 (2012).
  7. A Soluble α-Dithienotetrathiafulvalene Derivative for Organic Field-Effect Transistors, I. Doi, K. Goshome, E. Miyazaki, K. Takimiya, Chem. Lett., 41, 435-437 (2012).
  8. Angular-shaped naphthodifurans, naphtho[1,2-b;5,6-b']- and naphtho[2,1-b;6,5-b']- difuran: Are they isoelectronic with chrysene?, M. Nakano, S. Shinamura, Y. Houchin, I. Osaka, E. Miyazaki, K. Takimiya, Chem. Commun., 48, 5671-5673 (2012).
  9. [2,2']Bi[naphtho[2,3-b]furanyl]: a versatile organic semiconductor with a furan-furan junction, K. Niimi, H. Mori, E. Miyazaki, I. Osaka, H. Kakizoe, K. Takimiya, C. Adachi, Chem. Commun., 48, 5892-5894 (2012).
  10. Facile synthesis of anthra[2,3-b]chalcogenophenes, K. Niimi, E. Miyazaki, I. Osaka, K. Takimiya, Synthesis, 44, 2102-2106 (2012).
  11. Organic photovoltaics based on 5-hexylthiophene-fused porphyrazines, H. Mori, E. Miyazaki, I. Osaka, K. Takimiya, Org. Electronics, 13, 1975-1980 (2012).
  12. Isomerically pure anthra[2,3-b:6,7-b']-difuran (anti-ADF), -dithiophene (anti-ADT), and -diselenophene (anti-ADS): Selective synthesis, electronic structures, and application to organic field-effect transistors, M. Nakano, K. Niimi, E. Miyazaki, I. Osaka1, K. Takimiya, J. Org. Chem. 77, 8099-8111 (2012).
  13. Largely π-Extended Thienoacenes with Internal Thieno[3,2-b]thiophene Substructures: Synthesis, Characterization, and Organic Field-Effect Transistor Applications, T. Yamamoto, T. Nishimura, T. Mori, E. Miyazaki, I. Osaka, K. Takimiya, Org. Lett., 14, 4914-4917 (2012).
  14. Orthogonally Functionalized Naphthodithiophenes: Selective Protection and Borylation, S. Shinamura, R. Sugimoto, N. Yanai, N. Takemura, T. Kashikix, I. Osaka, E. Miyazaki, K. Takimiya, Org. Lett., 14, 4718-4721 (2012).
  15. Borylation on Benzo[1,2-b:4,5-b']- and Naphtho[1,2-b:5,6-b']- dichalcogenophenes: Different Chalcogene Atom Effects on Borylation Reaction Depending on Fused Ring Structure, M. Nakano, S. Shinamura, R. Sugimoto, I. Osaka, E. Miyazaki, K. Takimiya, Org. Lett., 14, 5448-5451 (2012).
  16. Two Isomeric Didecyl-dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophenes: Impact of Alkylation Positions on Packing Structures and Organic Field-effect Transistor Characteristics, M. J. Kang, E. Miyazaki, I. Osaka1, K. Takimiya, Jpn. J. Appl. Phys., 51, 11PD04 (2012).


  1. Alkylated Dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophenes (Cn-DNTTs): Organic Semiconductors for High-Performance Thin-Film Transistors, M. J. Kang, I. Doi, H. Mori, E. Miyazaki, K. Takimiya, H. Kuwabara, M. Ikeda, Adv. Mater., 23, 1222-1225 (2011).
  2. Synthesis and Properties of N1-(3-Methoxypropyl)-N3-methylimidazolium Salts, E. Miyazaki, N. Ishine, K. Takimiya, H. Kai, Heterocycles, 82, 1317-1325 (2011).
  3. One-step Synthesis of [1]Benzothieno[3,2-b][1]benzothiophene from o-Chlorobenzaldehyde, M. Saito, I. Osaka, E. Miyazaki, K. Takimiya, H. Kuwabara, M. Ikeda, Tetrahedron Lett., 52, 285-288 (2011).
  4. Quinoidal Oligothiophenes with (Acyl)cyanomethylene Termini: Synthesis, Characterization, Properties, and Solution Processed n-Channel Organic Field-Effect Transistors, Y. Suzuki, M. Shimawaki, I. Osaka, E. Miyazaki, K. Takimiya, Chem. Mater. 23, 795-804 (2011).
  5. Linear- and Angular-Shaped Naphthodithiophenes: Selective Synthesis, Properties, and Application to Organic Field-Effect Transistors, S. Shinamura, I. Osaka, E. Miyazaki, A. Nakao, M. Yamagishi, J. Takeya, K. Takimiya, J. Am. Chem. Soc. 133, 5024-5035 (2011).
  6. Impact of Isomeric Structures on Transistor Performances in Naphthodithiophene Semiconducting Polymers, I. Osaka, T. Abe, S. Shinamura, K. Takimiya, J. Am. Chem. Soc., 133, 6852-6860 (2011).
  7. Synthesis and Characterization of Benzo[1,2-b:3,4-b´:5,6-b´´]trithiophene (BTT) Oligomers, T. Kashiki, M. Kohara, I. Osaka, E. Miyazaki, K. Takimiya, J. Org. Chem., 76 (10), 4061-4070 (2011)
  8. Simple Oligothiophene-Based Dyes for Dye-Sensitized Solar Cells (DSSCs): Anchoring Group Effects for Molecular Properties and Solar Cell Performances, E. Miyazaki, T. Okanishi, Y. Suzuki, N. Ishine, H. Mori, K. Takimiya, and Y. Harima, Bull. Chem. Soc. Jpn. 84, 459- 465 (2011). BCSJ Award Article.
  9. Dianthra[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DATT): Synthesis, Characterization, and FET Characteristics of New p-Extended Heteroarene with Eight Fused Aromatic Rings, K. Niimi, S. Shinamura, E. Miyazaki, I. Osaka, and Kazuo Takimiya, J. Am. Chem. Soc., 133, 8732-8739 (2011).
  10. Efficient Photocurrent Generation at Dinaphtho[2,3-b:2’,3’-f] thieno[3,2-b]thiophene (DNTT)/C60 Bilayer Interface, H. Mori, K. Takimiya, Appl. Phys. Express, 4, 061602 (2011).
  11. General Synthesis of Dinaphtho[2,3-b:2´,3´-f]thieno[3,2-b]thiophene (DNTT) Derivatives, K. Niimi, M. J. Kang, E. Miyazaki, I. Osaka, K. Takimiya, Org. Lett. 13, 3430-3433 (2011).


  1. Three Structural Isomers of Dinaphthothieno[3,2-b]thiophenes: Elucidation of Physicochemical Properties, Crystal Structures, and Field-Effect Transistor Characteristics, T. Yamamoto, S. Shinamura, E. Miyazaki, K. Takimiya, Bull. Chem. Soc. Jpn., 83, 120-130 (2010).
  2. Synthesis, Properties, Crystal Structures, and Semiconductor Characteristics of Naphtho[1,2-b:5,6-b´]-dithiophene and -diselenophene Derivatives, S. Shinamura, E. Miyazaki, K. Takimiya, J. Org. Chem. 75, 1228-1234 (2010).
  3. High Mobility Semiconducting Naphthodithiophene Copolymers, I. Osaka, T. Abe, S. Shinamura, E. Miyazaki, Eigo, K. Takimiya, J. Am. Chem. Soc. 132, 5000-5001 (2010).
  4. Unique Three-Dimensional (3D) Molecular Array in Dimethyl-DNTT Crystals: a New Approach to 3D Organic Semiconductors, M. J. Kang, T. Yamamoto, S. Shinamura, E. Miyazaki, K. Takimiya, Chem. Sci., 1, 179-183 (2010).
  5. Thieno[3,4-c]pyrrole-incorporated Quinoidal Terthiophene with Dicyanomethylene Termini: Synthesis, Characterization, and Redox Properties, K. Takeda, M. Shimawaki, A, Nakano, I. Osaka, E. Miyazaki, K. Takimiya, Tetrahedron Lett., 51, 4375-4377 (2010).
  6. Alkyloxycarbonylcyanomethylene-Substituted Thienoquinoidal Compounds: a New Class of Soluble n-Channel Organic Semiconductors for Air-Stable Organic Field-Effect Transistors, Y. Suzuki, E. Miyazaki, K. Takimiya, J. Am. Chem. Soc., 132, 10453-10466 (2010).
  7. Facile synthesis of [1]benzothieno[3,2-b]benzothiophene from o-dihalostilbenes, M. Saito, T. Yamamoto, I. Osaka, E. Miyazaki, K. Takimiya, H. Kuwabara, M. Ikeda, Tetrahedron Lett., 51, 5277-5280 (2010).
  8. Benzobisthiazole-Based Semiconducting Copolymers Showing Excellent Environmental Stability in High-Humidity Air, I. Osaka, R. McCllough, K. Takimiya, 22, Adv. Mater., 4993-4997 (2010).


  1. Solution-Processible Organic Semiconductors Based on Selenophene-Containing Heteroarenes, 2,7-Dialkyl[1]benzoselenopheno[3,2-b][1]benzoselenophenes (Cn-BSBSs): Syntheses, Properties, Molecular Arrangements, and Field-Effect Transistor Characteristics T. Izawa, E. Miyazaki, K. Takimiya, Chem. Mater., 21, 903-912(2009).
  2. Unique Molecular Arrangement in Semiconducting Layer and FET Characteristics of Thin Film Transistors Based on 2,6-Dialkylbenzo[1,2-b:4,5-b´]diselenophenes (Cn-BDSs), S. Shinamura, T. Kashiki, T. Izawa, E. Miyazaki, K. Takimiya, Chem. Lett. 38, 352-353(2009).
  3. Molecular Modification of 2,7-Diphenyl[1]benzothieno[3,2-b]benzothiophene (DPh-BTBT) with Diarylamino Substituents: From Crystalline Order to Amorphous State in Evaporated Thin Films, T. Izawa, H. Mori, Y. Shinmura, M. Iwatani, E. Miyazaki, K. Takimiya, H.-W. Hung, M. Yahiro, C. Adachi, Chem. Lett. 38, 420-421 (2009).
  4. Alkylated 2,6-Bis(dicyanomethylene)-2,6-dihydrobenzo[1,2-b:4,5-b´]dithiophenes: New Soluble n-Channel Organic Semiconductors for Air-stable OFETs, T. Kashiki, E. Miyazaki, K. Takimiya, Chem. Lett. 38, 568-569 (2009).
  5. Air-Stable Solution-Processed Ambipolar Organic Field-Effect Transistors Based on Dicyanomethylene-Substituted Terheteroquinoid Derivative, S. Handa, E. Miyazakia, K. Takimiya, Chem. Commun. 3919-3921 (2009).
  6. One-pot Synthesis of Benzo[b]thiophenes and Benzo[b]selenophenes from o-Halo-Substituted Ethynylbenzenes: Convenient Approach to Mono-, Bis-, and Tris-Chalcogenophene-Annulated Benzenes, T. Kashiki, S. Shinamura, M. Kohara, E. Miyazaki, K. Takimiya, M. Ikeda, H. Kuwabara, Org. Lett. 11, 2473-2475 (2009).
  7. 5-Hexylthiophene-fused porphyrazines: new soluble phthalocyanines for solution-processed organic electronic devices, E. Miyazaki, A. Kaku, H. Mori, M. Iwatani, and K. Takimiya, J. Mater. Chem., 19, 5913-5915 (2009).


  1. A high mobility ambipolar field effect transistor using a 2,6-diphenylbenzo[1,2-b:4,5-b’]diselenophene/fullerene double layer, S. Kinoshitaa, T. Sakanouea, M. Yahiro, K. Takimiya, H. Ebata, M. Ikeda, H. Kuwabara, C. Adachi, Solid State Commun. 145, 114-117 (2008).
  2. 2,6-Dialkylbenzo[1,2-b:4,5-b´]dithiophenes (Cn-BDTs) as Soluble Organic Semiconductors for Solution-processed Organic Field-effect Transistors, Tomoya Kashiki, Eigo Miyazaki, Kazuo Takimiya, Chem. Lett., 37, 284-285 (2008).
  3. Molecular Ordering of High-Performance Soluble Molecular Semiconductors and Re-evaluation of Their Field-Effect Transistor Characteristics, T. Izawa, E. Miyazaki, K. Takimiya, Adv. Mater., 20, 3388-3393 (2008).
  4. Synthesis and Characterization of N-Acyl-substituted PyrroloTTF Derivatives and Improved Air-stability of PyrroloTTF-based OFETs, I. Doi, E. Miyazaki, and K. Takimiya, Chem. Lett., 37, 1088-1089 (2008).
  5. Electrical characteristics of single-component ambipolar organic field-effect transistors and effects of air exposure on them, T. Sakanoue, M. Yahiro, C. Adachi, K. Takimiya, A. Toshimitsu, J. Appl. Phys., 103, 094509 (2008).
  6. Raman Spectroscopy Shows Interchain through Space Charge Delocalization in a Mixed Valence Oligothiophene Cation and in Its pi-Dimeric Biradicaloid Dication, J. Casado, K. Takimiya, T. Otsubo, F. J. Ramirez, J. J. Quirante, R. P. Ortiz, S. R. Gonzalez, M. M. Oliva, J. T. L. Navarretel, J. Am,. Chem. Soc., 130, 14028-14029 (2008).


  1. Facile Synthesis of Highly π-Extended Heteroarenes, Dinaphtho[2,3-b:2',3'-f]chalcogenopheno[3,2-b]chalcogenophenes, and Their Application to Field-Effect Transistors, T. Yamamoto, K. Takimiya, J. Am. Chem. Soc., 129, 2224-2225 (2007).
  2. Design strategy for air-stable organic semiconductors applicable to high performance field-effect transistors, K. Takimiya, T, Yamamoto, H. Ebata, T. Izawa, Sci. Tech. Adv. Mater., 8, 273-276 (2007).
  3. Solution-Processible n-Channel Organic Field-Effect Transistors Based on Dicyanomethylene-substituted Terthienoquinoid Derivative, S. Handa, E. Miyazaki, K. Takimiya, Y. Kunugi, J. Am. Chem. Soc., 129, 11684-11685 (2007).
  4. Conductive, Magnetic, and Optical Properties of Sterically Hindered Dodecithiophenes. Evidence for the Coexistence of Bipolaron and π-Dimer, T. Kurata, T. Mohri, K. Takimiya, T. Otsubo, Bull. Chem. Soc. Jpn. 80, 1799-1807 (2007).
  5. Development of N-Alkyl-Substituted Bis(pyrrolo[3,4-d])tetrathiafulvalenes as Organic Semiconductors for Solution-Processible Field-Effect Transistors, I. Doi, E. Miyazaki, K. Takimiya, Y. Kunugi, Chem. Mater., 19, 5230-5237 (2007).
  6. Synthesis, Properties, and Structure of Benzo[1,2-b:4,5-b']bis[b]benzothiophene and Benzo[1,2-b:4,5-b']bis[b]benzoselenophene, H. Ebata, T. Yamamoto, E. Miyazaki, K. Takimiya, Org. Lett., 9, 4449-4502 (2007).
  7. Highly Soluble [1]Benzothieno[3,2-b]benzothiophene (BTBT) Derivatives for High-Performance, Solution-Processed Organic Field-Effect Transistors, H. Ebata, T. Izawa, E. Miyazaki, K. Takimiya, M. Ikeda, H. Kuwabara, T. Yui, J. Am. Chem. Soc., 129, 15732-15733 (2007).
  8. FET characteristics of dinaphthothienothiophene (DNTT) on Si/SiO2 substrates with various surface-modifications, T. Yamamoto, K. Takimiya, J. Photopolymer Sci. Tech. 2007, 20, 57-59.
  9. On the Biradicaloid Nature of Long Quinoidal Oligothiophenes: New Experimental Evidences Guided by Theoretical Studies, R. P. Ortiz, J. Casado, V. Hernandez, J. T. L. Navarrete, P. M. Viruela, E. Orti, K. Takimiya, T. Otsubo, Angew. Chem. Int. Ed., 46, 9057-9061 (2007).


  1. Organic Filed-Effect Transistors based on 2,6-Diphenylbenzo[1,2-b:5,4-b']-dithiophene and -diselenophene (iso-DPh-BDXs), K. Takimiya, Y. Konda, H. Ebata, T. Otsubo, Y. Kunugi, Mol. Cryst. Liq. Cryst., 455, 361-365 (2006).
  2. 2,7-Diphenyl[1]benzoselenopheno[3,2-b][1]benzoselenophene as Stable Organic Semiconductor for High-Performance Field-Effect Transistor, K. Takimiya, Y. Kunugi, Y. Konda, H. Ebata, Y. Toyoshima, T. Otsubo, J. Am. Chem. Soc., 128 (9), 3044-3050 (2006).
  3. Synthesis and Properties of Ethylenethiotetraselenafulvalene (ET-TSF) and Its conductive Radical Cation Salts, K. Takimiya, M. Kodani, S. Murakami, T. Otsubo, Y. Aso, Heterocycles, 67, 655-663 (2006).
  4. Synthesis and Photophysical Properties of Two Dual Oligothiophene-Fullerene Linkage Molecules as Photoinduced Long-Distance Charge Separation Systems, M. Narutaki, K. Takimiya, T. Otsubo, Y. Harima, H. Zhang, Y. Araki, O. Ito, J. Org. Chem., 71, 1761-1768 (2006).
  5. Development and Photovoltaic Performance of Oligothiophene-sensitized TiO2 Solar Cells, K. Tanaka, K. Takimiya, T. Otsubo, K. Kawabuchi, S. Kajihara, Y. Harima, Chem. Lett., 35, 592-593 (2006).
  6. Synthesis and Photovoltaic Properties of Tetrathiafulvalene-Oligothiophene-Fullerene Triads, H. Kanato, M. Narutaki, K. Takimiya, T. Otsubo, Y. Harima, Chem. Lett., 35, 668-669 (2006).
  7. Thin Film Characteristics and FET Performances of β-Octyl-substituted Long Oligothiophenes,K. Takimiya, K. Sakamoto, T. Otsubo, Y. Kunugi,Chem. Lett., 35, 942-943 (2006).
  8. Effects of Extension or Prevention of π-Conjugation on Photoinduced Electron Transfer Processes of Ferrocene-Oligothiophene-Fullerene Triads , T. Nakamura, H. Kanato, Y.; Araki, O. Ito, K. Takimiya, T. Otsubo, Y. Aso, J. Phys. Chem. A, 110, 3471-3479 (2006).
  9. Hybrid Organic Semiconductors Including Chalcogen Atoms in π-Conjugated Skeletons. Tuning of Optical, Redox, and Vibrational Properties by Heavy Atom Conjugation, J. Casado, M. Moreno Oliva, M. C. Ruiz Delgado, R. Ponce Ortiz, J. Joaquin Quirante, J. T. Lopez Navarrete, K. Takimiya, T. Otsubo, J. Phys. Chem. A., 110, 7422-7430 (2006).
  10. Changes in Electrochemical and Optical Properties of Oligoalkylthiophene Film Induced by Bipolaron Formation, Y. Harima, R. Patil, H. Liu, Y. Ooyama, K. Takimiya, T. Otsubo, J. Phys. Chem. B., 110 , 1529-1535 (2006).
  11. 2,7-Diphenyl[1]benzothieno[3,2-b]benzothiophene, New Organic Semiconductor for Air-Stable Organic Field-Effect Transistors with Mobilities up to 2.0 cm2 V-1 s-1, K. Takimiya, H. Ebata, K. Sakamoto, T. Izawa, T. Otsubo, Y. Kunugi, J. Am. Chem. Soc., 128, 12604-12605 (2006)
  12. Molecular Modification of 2,6-Diphenylbenzo[1,2-b:4,5-b']dichalcogenophenes by Introduction of Strong Electron Withdrawing Groups: Conversion from p- to n-Channel OFET Materials, K Takimiya, Y. Kunugi, H. Ebata, T. Otsubo, Chem. Lett., 35, 1200-1201 (2006).


  1. Naphthobischalcogenadiazole Conjugated Polymers: Emerging Materials for Organic Electronics, I. Osaka, K. Takimiya, Adv. Mater., in press, (DOI: 10.1002/adma.201605218).
  2. Sodium Sulfide-Promoted Thiophene-Annulations: Powerful Tools for Elaborating Organic Semiconducting Materials, M. Nakano, K. Takimiya, Chem. Mater., 29, 256-264 (2017) .
  3. Design and elaboration of organic molecules for high field-effect-mobility semiconductors, K. Takimiya, M. Nakano, H. Sugino, I. Osaka, Synth. Met., 217, 68-78 (2016).
  4. Backbone Orientation in Semiconducting Polymers, I. Osaka, K. Takimiya, Polymer, 59, A1-A15 (2015).
  5. Naphthodithiophenes: Emerging Building Blocks for Organic Electronics, K. Takimiya, I. Osaka, Chem. Rec., 15, 175-188 (2015).
  6. π-Building blocks for organic electronics: Revaluation of “inductive” and “resonance” effects of π-electron deficient units, K. Takimiya, I. Osaka, M. Nakano, Chem. Mater., 26, 587-593 (2014).
  7. Organic Semiconductors Based on [1]Benzothieno[3,2-b][1]benzothiophene Substructure, K. Takimiya, I. Osaka, T. Mori, M. Nakano, Acc. Chem. Res., 47, 1493-1502 (2014).
  8. [1]Benzothieno[3,2-b][1]benzothiophenes- and dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene-based organic semiconductors for stable, high-performance organic thin-film transistor materials, K. Takimiya, T. Yamamoto, H. Ebata, T. Izawa, Thin Solid Films, 554, 13-18 (2014).
  9. Thienannulation : efficient synthesis of π-extended thienoacenes applicable to organic semiconductors, K. Takimiya, M. Nakano, M. J. Kang, E. Miyazaki, I. Osaka, Eur. J. Org. Chem. 217-227 (2013).
  10. Naphthodithiophenes as Building Units for Small Molecules to Polymers; A Case Study for In-Depth Understanding of Structure-Property Relationships in Organic Semiconductors, I. Osaka, S. Shinamura, T. Abe, K. Takimiya, J. Mater. Chem. C, 1, 1297-1304 (2013). (selected as “2013 Journal of Materials Chemistry C Hot Papers”, and “2013 Most Accessed Manuscripts for Journal of Materials Chemistry C”)
  11. AIR-STABLE AND HIGH-MOBILITY ORGANIC SEMICONDUCTORS BASED ON HETEROARENES FOR FIELD-EFFECT TRANSISTORS, S. Shinamura, I. Osaka, E. Miyazaki, and K. Takimiya, Heterocycles, 83, 1187-1204 (2011).
  12. Thienoacene-based Organic Semiconductors, K. Takimiya, S. Shinamura, I. Osaka, E. Miyazaki, Adv. Mater. 23, 4347-4370 (2011).
  13. Development of New Semiconducting Materials for Durable High-Performance Air-stable Organic Field-Effect Transistors (Highlight Review), K. Takimiya, Y. Kunugi, T. Otsubo, Chem. Lett. 36, 578-583 (2007).

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