Solar cells utilizing small molecular weight organic semiconductors

Progress in Photovoltaics: Research and Applications - Tập 15 Số 8 - Trang 659-676 - 2007
Barry P. Rand1, Jan Genoe1, Paul Heremans1, Jef Poortmans1
1Polymer and Molecular Electronics, IMEC, Kapeldreef 75, B‐3001 Leuven, Belgium

Tóm tắt

AbstractIn this review, we focus on the field of organic photovoltaic cells based on small molecular weight materials. In particular, we discuss the physical processes that lead to photocurrent generation in organic solar cells, as well as the various architectures employed to optimize device performance. These include the donor–acceptor heterojunction for efficient exciton dissociation, the exciton blocking layer, the mixed or bulk heterojunction, and the stacked or tandem cell. We show how the choice of materials with known energy levels and absorption spectra affect device performance, particularly the open‐circuit voltage and short‐circuit current density. We also discuss the typical materials and growth techniques used to fabricate devices, as well as the issue of device stability, all of which are critical for the commercialization of low‐cost and high‐performance organic solar cells. Copyright © 2007 John Wiley & Sons, Ltd.

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