Limits of open circuit voltage in organic photovoltaic devices

被引：73

作者：

Lo, M. F. ^{[1
]}

Ng, T. W. ^{[1
]}

Liu, T. Z. ^{[1
]}

Roy, V. A. L. ^{[1
]}

Lai, S. L. ^{[1
]}

Fung, M. K. ^{[1
]}

Lee, C. S. ^{[1
]}

Lee, S. T. ^{[1
]}

机构：

[1] City Univ Hong Kong, Dept Phys & Mat Sci, COSDAF, Hong Kong, Hong Kong, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 11期

关键词：

aluminium; binding energy; excitons; fullerene devices; fullerenes; impurity states; indium compounds; MIM devices; organic semiconductors; photovoltaic cells; work function; HETEROJUNCTION SOLAR-CELLS; EFFICIENCY;

D O I：

10.1063/1.3360336

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Open circuit voltage (V-oc) of organic photovoltaic devices has been interpreted with either the metal-insulator-metal (MIM) model or the energy offset between highest occupied molecular orbital (HOMO) of the donor and the lowest unoccupied molecular orbital (LUMO) of the acceptor (HOMOD-LUMOA). To elucidate the relation between V-oc and the two models, we have used electrodes of a wide range of work functions to connect the CuPc/C60 organic photovoltaic devices. We found that when the work function difference (Delta phi(electrodes)) between ITO and Al electrode is in the range -3 and 0 eV, V-oc increases linearly with Delta phi(electrodes) as prescribed by the MIM model. Outside this range, V-oc saturates with values close to that given by the HOMOD-LUMOA less the exciton binding energy.

引用

页数：3

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