Electron transport studies on bulk heterojunction at extremely low temperatures

• Project/Area Number: 24550147
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional materials chemistry
• Research Institution: University of Hyogo (2013-2014); The University of Tokyo (2012)
• Principal Investigator: TAJIMA HIROYUKI 兵庫県立大学, 物質理学研究科, 教授 (60207032)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2012: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: トラップ / CELIV / 移動度 / 有機薄膜デバイス / 有機太陽電池 / Photo-CELIV / 有機スピントロニクス / 導電性有機物 / 有機デバイス / 有機半導体 / 光CELIV / 太陽電池 / geminate対

Outline of Final Research Achievements

In this study, we have developed a new method for obtaining the trap density function based on photo-carrier extraction experiments using a linearly increasing voltage (photo-CELIV). The photo-CELIV technique was originally developed in order to determine the time and field dependence of the hopping conduction mobility for charge carriers generated by a light pulse. In most CELIV studies, CELIV data are analyzed based on the assumption of an effective mobility and traps are not explicitly considered. We applied this technique to determine the trap density function of the photovoltaic cell composed of P3HT:PCBM bulk heterojunction. The gaussian-type trap density with an average energy of 0.087eV was obtained.

Research Products

• [Journal Article] Fabrication of a field effect transistor structure using charge-ordered organic materials α-(BEDT-TTF)2I3 and α′-(BEDT-TTF)2IBr2 (2013)
  • Author(s): M. Kimata, T. Ishihara, A. Ueda, H. Mori, H. Tajima
  • Journal Title: Synthetic Metals Volume: 173 Pages: 43-45
  • Peer Reviewed
• [Journal Article] Giant negative magnetoresistance in an organic nanocrystal: site-selective device fabrication by nanoscale electrocrystallization (2013)
  • Author(s): H. Hasegawa, M. Matsuda, H. Tajima
  • Journal Title: J. Mater. Chem. C Volume: 1 Pages: 6416-6421
  • Peer Reviewed
• [Journal Article] Magnetic torque experiments on TPP[Fe (Pc)L2]2 (L=Br and Cl): Antiferromagnetic short range ordering of d electrons, Antiferromagnetic ordering of pi electrons, and the anisotropy energy (2013)
  • Author(s): K. Torizuka, H. Tajima, M. Inoue, N. Hanasaki, M. Matsuda, D. E. C. Yu, T. Naito, T. Inabe
  • Journal Title: J. Phys. Soc. Jpn Volume: 82
  • Peer Reviewed
• [Journal Article] Calibration Technique Using Nonlinear Region in Cantilever Magnetometry Experiments and Presence of Universal Curve (2013)
  • Author(s): K. Torizuka, H. Tajima, G. Yoshida, M. Inoue
  • Journal Title: J. Appl. Phys. Volume: 52
  • NAID: 40019678410
  • Peer Reviewed
• [Journal Article] Metamagnetic Transition and Its Related Magnetocapacitance Effect in Phthalocyanine-Molecular Conductor Exhibiting Giant Magnetoresistance (2013)
  • Author(s): N. Hanasaki, T. Tateishi, H. Tajima, M. Kimata, M. Tokunaga, M. Matsuda, A. Kanda, H. Murakawa, T. Naito, T. Inabe
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82
  • NAID: 40019788762
  • Peer Reviewed
• [Journal Article] Electrochemically Fabricated Phthalocyanine-Based Molecular Conductor Films and Their Potential Use in Organic Electronic Devices (2013)
  • Author(s): M. Matsuda, N. Kinoshita, M. Fujishima, S. Tanaka, H. Tajima, and H. Hasegawa
  • Journal Title: Appl. Phys. Express Volume: 6 Issue: 2 Pages: 21602-21602
  • DOI: 10.7567/apex.6.021602
  • NAID: 10031152675
  • Peer Reviewed
• [Journal Article] haracteristics of organic loght-emitting devices consisting of dye-doped spin crossover complex films (2013)
  • Author(s): 松田真生、清島啓太、内田龍馬、木下頌章、田島裕之
  • Journal Title: Thin Solid Films Volume: 531 Pages: 451-453
  • DOI: 10.1016/j.tsf.2013.01.094
  • Peer Reviewed
• [Journal Article] Magnetic Torque Experiments on TPP[Fe(Pc)L2]2 (L = Br and Cl): Antiferromagnetic Short-Range Ordering of d Electrons, Antiferromagnetic Ordering of Electrons, and Anisotropy Energy (2013)
  • Author(s): Kiyoshi TORIZUKA, Hiroyuki TAJIMA, Munenori INOUE, Noriaki HANASAKI, Masaki MATSUDA, Derrick E. C. YU, Toshio NAITO, and Tamotsu INABE
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 3 Pages: 034719-034719
  • DOI: 10.7566/jpsj.82.034719
  • Peer Reviewed
• [Journal Article] Direct determination of trap density function based on the photoinduced charge extraction technique (2012)
  • Author(s): H. Tajima, T. Suzuki, M. Kimata
  • Journal Title: Organic Electronics Volume: 13 Issue: 11 Pages: 2272-2280
  • DOI: 10.1016/j.orgel.2012.07.017
  • Peer Reviewed
• [Journal Article] Electrostatic Charge Carrier Injection into the Charge-Ordered Organic Material alpha-(BEDT-TTF)2I3 (2012)
  • Author(s): M. Kimata, T. Ishihara, and H. Tajima
  • Journal Title: J. Phys. Soc. Jpn. Volume: 81 Issue: 7 Pages: 073704-073704
  • DOI: 10.1143/jpsj.81.073704
  • Peer Reviewed
• [Presentation] Photo-CELIV Experiments under Magnetic field (2015)
  • Author(s): 田島裕之
  • Organizer: PACIFICHEM2015
  • Place of Presentation: ハワイ、アメリカ合衆国
  • Year and Date: 2015-12-16
  • Invited
• [Presentation] Magnetophotocurrent Associated with Excited States in Organic Compound: An approach using photo-CELIV Measurements (2015)
  • Author(s): 田島裕之
  • Organizer: ブラジル物理学会
  • Place of Presentation: イグアスフォールズ,ブラジル連邦共和国
  • Year and Date: 2015-05-25 – 2015-05-28
  • Invited
• [Presentation] Magnetoresistance and Magnetophotocurrent Associated with Excited States in Organic Compound: An approach using photo-CELIV Measurements (2014)
  • Author(s): 田島裕之
  • Organizer: International Workshop on Organic Spintronics and Organic SolarCells
  • Place of Presentation: 武漢、中華人民共和国
  • Year and Date: 2014-06-26 – 2014-06-27
  • Invited
• [Presentation] ペリレン単結晶を用いた電界効果型トランジスタ (2014)
  • Author(s): 有馬駿介、宮尾文啓、佐藤井一、田島裕之
  • Organizer: 日本化学会春季年会
  • Place of Presentation: 名古屋大学、愛知県
• [Presentation] Spin Injection into Organic Polymer Film by Spin Pumping (2014)
  • Author(s): Motoi Kimata, Daisuke Nozaki, Hiroyuki Tajima
  • Organizer: The workshop on organic magneto-optic, magneto-electronic, and magneto-thermoelectric properties
  • Place of Presentation: 武漢、中華人民共和国
  • Invited
• [Presentation] Low-temperature Photo-CELIV Measurement: A New Technique to Determine the Density of Geminate Pairs in Organic Photovoltaic Cells (2014)
  • Author(s): H. Tajima
  • Organizer: The 11thChina-Japan Joint Symposium on Conduction and Photoconduction in Organic Solids and Related Phenomena
  • Place of Presentation: 長春、中華人民共和国
• [Presentation] 有機薄膜における光電流磁場効果 (2013)
  • Author(s): 田島裕之
  • Organizer: 日本化学会春季年会（特別企画）
  • Place of Presentation: 立命館大学、滋賀県
  • Invited
• [Presentation] 極低温におけるバルクへテロ接合の研究 (2013)
  • Author(s): 田島裕之
  • Organizer: 東北大学G-COE研究会「金属錯体の固体物性科学最前線―錯体化学と固体物性物理と生物物性の連携新領域創成をめざしてー」
  • Place of Presentation: 仙台
• [Presentation] Comprehensive Analysis of the Photo-CELIV Data at Low Temperatures (2012)
  • Author(s): H. Tajima, T. Suzuki, M. Kimata
  • Organizer: International Workshop on Novel Nanomagnetic and Multifunctional Materials
  • Place of Presentation: Seoul（韓国）
  • Invited
• [Presentation] Low-temperature Photo-CELIV Measurement: A New Technique to Determine Trap Density in Organic Thin Films (2012)
  • Author(s): H. Tajima
  • Organizer: 4th Topical Meeting on Spins in Organic Semiconductors (SPINOS2012)
  • Place of Presentation: London(英国)
  • Invited
• [Presentation] Low-temperature Photo-CELIV Measurement: A New Technique to Determine Trap Density Function in Organic Thin Films and its Application to MFE phenomena (2012)
  • Author(s): H. Tajima
  • Organizer: The 2nd Taiwan Organic Spintronics Workshop
  • Place of Presentation: 台南 (台湾)
  • Invited
• [Presentation] Low-temperature Photo-CELIV Measurement: A New Technique to Determine Trap Density and Mobility in Organic Thin Films (2012)
  • Author(s): H. Tajima, T. Suzuki, R. Liu, M. Kimata
  • Organizer: International Conference on Flexible and Printed Electronics （ICFPE2012）
  • Place of Presentation: 東京大学（東京）
• [Book] 大学院講義物理化学（第2版）「III.固体の化学と物性」 （7章４節） (2012)
  • Author(s): 田島裕之（共著）
  • Publisher: 東京化学同人