2012 Fiscal Year Final Research Report
Study on exploitation of near-infrared dyes for organic photovoltaic cells
| Project/Area Number |
23655044
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Organic chemistry
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| Research Institution | Ehime University |
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Principal Investigator |
UNO Hidemitsu 愛媛大学, 大学院・理工学研究科, 教授 (20168735)
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| Co-Investigator(Renkei-kenkyūsha) |
OKUJIMA Tetsuo 愛媛大学, 大学院・理工学研究科, 准教授 (60359924)
MORI Shigeki 愛媛大学, 総合科学研究支援センター, 講師 (30572028)
YAMADA Hiroko 奈良先端科学技術大学院大学, 物質創成科学研究科, 教授 (20372724)
KOBAYASHI Nagao 東北大学, 大学院・理学研究科, 教授 (60124575)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 有機太陽電池 / ペリ環状分解反応 / ボロンジピロメテン / 近赤外色素 / ビスボロンジピロメテン |
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| Research Abstract |
Highly conjugated organic compounds absorbing near-infrared light are essential materials for improvement of organic photovoltaic cells. In this study, we synthesize dyes with a novel skeleton bearing near-infrared absorption and investigate their electronic properties as well as potentials for organic photovoltaic-cell materials by the solution-processed fabrication of their precursors. When the two-dimensional πsystems such as porphyrins are fused with a benzene unit, there must be two major transitions: a longitudinal transition directed along the fused rings and short transitions due to the individual porphyrin rings. Therefore, strong absorption remains in a visible region, even if the absorption with the longest wavelength reaches to the near-infrared region. On the other hand, the πsystem of boron-dipyrromethene (BODIPY) spreads one-dimensionally and has one strong absorption band at ca. 500 nm. We succeeded in the synthesis of bisBODIPY dyes having absorption only in the near-infrared region due to the longitudinal transition by fusion of the BODIPY chromophores in the longitudinal fashion. In addition, we succeeded inthe preparation of stable near-infrared dyes under air by introduction of electron-withdrawing groups. Now, the application studies for near-infrared specific filters, organic photovoltaic cells, etc. are underway in the cooperative companies.
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[Journal Article] Cyclo[8]isoindoles: Ring-Expanded and Annelated Porphyrinoids2011
Author(s)
T. Okujima, G. Jin, N. Matsumoto, J. Mack, S. Mori, K. Ohara, D. Kuzuhara, C. Ando, N. Ono, H. Yamada, H. Uno, and N. Kobayashi
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Journal Title
Angew. Chem. Int. Ed
Volume: 50
Pages: 5699-5703
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