Open AccessThe Photovoltaic Mechanism of a Polythiophene/Perylene Pigment Two-Layer Solar Cell
Author(s) -
Junichi Nakamura,
Shinji Suzuki,
Kohshin Takahashi,
Chiho Yokoe,
Kazuhiko Murata
Publication year - 2004
Publication title -
bulletin of the chemical society of japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.145
H-Index - 99
eISSN - 1348-0634
pISSN - 0009-2673
DOI - 10.1246/bcsj.77.2185
Subject(s) - photocurrent , perylene , polythiophene , chemistry , homo/lumo , photovoltaic system , organic solar cell , photochemistry , solar cell , photoactive layer , open circuit voltage , polymer solar cell , optoelectronics , energy conversion efficiency , active layer , layer (electronics) , polymer , conductive polymer , materials science , organic chemistry , voltage , physics , molecule , ecology , thin film transistor , quantum mechanics , biology
The energy conversion efficiency of a two-layer organic solar cell consisting of a perylene pigment (PV) and regioregular polythiophene polymer (P3DT) was 0.99% under illumination with simulated solar light (AM 1.5–100 mW cm−2). The photovoltaic mechanism is discussed on the basis of the ionization potential of the component materials. The photoinduced hole-transfer from PV to P3DT quickly occurred at the PV/P3DT interface because of the large free energy change of 1.2 eV, then the subsequent charge separation efficiently proceeded, resulting in a large short-circuit photocurrent of 6.5 mA cm−2. On the other hand, the open-circuit photovoltage was only 0.42 V because the LUMO level of PV is close to the HOMO level of P3DT. The difference between the LUMO and the HOMO can be attributed to the open-circuit photovoltage
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