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The Photovoltaic Mechanism of a Polythiophene/Perylene Pigment Two-Layer Solar Cell

2004; Oxford University Press; Volume: 77; Issue: 12 Linguagem: Inglês

10.1246/bcsj.77.2185

1348-0634

Jun‐ichi Nakamura, Shinji Suzuki, Kohshin Takahashi, Chiho Yokoe, Kazuhiko Murata,

Photochromic and Fluorescence Chemistry

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.