Influence of the donor/acceptor interface on the open-circuit voltage in organic solar cells

Liu, Z.T., Lo, M.F., Wang, H.B., Ng, T.W., Roy, V.A.L. , Lee, C.S. and Lee, S.T. (2009) Influence of the donor/acceptor interface on the open-circuit voltage in organic solar cells. Applied Physics Letters, 95(9), 093307. (doi: 10.1063/1.3222975)

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Abstract

The donor/acceptor interface in a standard CuPc/C60 organic solar cell was modified by insertion of a thin layer of molybdenum trioxide (MoO3). An ultrathin layer of MoO3 between the donor and acceptor increased the open-circuit voltage (VOC) from 0.45 to 0.85 V. The enhancement in VOC is explained by the increase in the energy level offset between the lowest unoccupied molecular orbital of the acceptor and the highest occupied molecular orbital of the donor (EDHOMO-EALUMO). The explanation is supported by the energy level analysis of the donor/acceptor interface by ultraviolet photoemission spectroscopy and x-ray photoemission spectroscopy.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Vellaisamy, Professor Roy
Authors: Liu, Z.T., Lo, M.F., Wang, H.B., Ng, T.W., Roy, V.A.L., Lee, C.S., and Lee, S.T.
College/School:College of Science and Engineering > School of Engineering
Journal Name:Applied Physics Letters
Publisher:AIP Publishing
ISSN:0003-6951
ISSN (Online):1077-3118
Published Online:04 September 2009

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