2007 Fiscal Year Final Research Report Summary
High efficiency polarization-sensitive organic photovoltaic devices
| Project/Area Number |
18360011
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
TSUTSUI Tetsuo Kyushu University, Institute for Materials Chemistry and Engineering, Professor (40037982)
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| Co-Investigator(Kenkyū-buntansha) |
FUJITA Katsuhiko Kyushu University, Institute for Materials Chemistry and Engineering, Associate Professor (20281644)
KATAHIRA Yoshiko Kyushu University, faculty of the Inteidisciplinary Graduate School of Engineering Sciences, Assistant Professor (90315143)
YASUDA Takeshi Kyushu University, Institute for Materials Chemistry and Engineering, Assistant Professor (30380710)
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| Project Period (FY) |
2006 – 2007
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| Keywords | organic semiconductor / solar cell / polarization-sensitive device / phthalocvanine / pervlene devivative / photovoltaic device |
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| Research Abstract |
We have reported the fabrication of polarization-sensitive photovoltaic devices made of heterojunction-type vacuum-sublimed multilayer films composed of aligned 3,4,9,10-perylenetetracarboxylic-bisbenzimidazole
(aligned PTCBI) and titanyl phthalocyanine (TiOPc). The PTCBI layer was made to be well aligned without losing high power conversion efficiency. The device configuration was ITO/In/aligned PTCBI/TiOPc'poly(3,4-ethylenedioxythiophene): poly (styrenesulfonate)/Au, and the thickness of each layer was optimized for polarization-sensitive photodetection. The power conversion efficiencies under polarized white light parallel and perpendicular to the molecular orientation axis were 0.78% and 0.45%, respectively. When monochromatic polarized light at 540 nm was used, the photocuxrent ratio of the parallel to the perpendicular condition reached a maximum of 2.32.
We have also demonstrated the enhancement of the device performance in polymer: PCBM blend photovoltaic cells by insertion of C60 interlayer between the active layer and the upper electrode. The active layer was fabricated by spin coating of a polymer: poly (2-methoxy-5-(20-ethyl-hexyloxy) -1,4-phenylenevinylene) (MEH-PPV) or poly (3-hexylthiopene) (P3HT) and fullerene derivative [5,6]-phenyl-C61-butyric acid methyl ester(PCBM), then the C60 interlayer and LiF/Al electrode were deposited. The both polymer cells with C60 interlayer showed significant increase in the power conversion efficiency compared to cells without the C60 layer.
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