Molecular and Morphological Influences on the Open Circuit Voltages of Organic Photovoltaic Devices
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- 11 June 2009
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 131 (26) , 9281-9286
- https://doi.org/10.1021/ja9007722
Abstract
We explore the dependence of the dark current of C60-based organic photovoltaic (OPV) cells on molecular composition and the degree of intermolecular interaction of several molecular donor materials. The saturation dark current density, JS, is an important factor in determining the open circuit voltage, Voc. The Voc values of OPVs show a strong inverse correlation with JS. Donor materials that show evidence for aggregation in their thin-film absorption spectra and polycrystallinity in thin film X-ray diffraction result in a high dark current, and thus a low Voc. In contrast, donor materials with structures that hinder intermolecular π-interaction give amorphous thin films and reduced values of JS, relative to donors with strong intermolecular π-interactions, leading to a high Voc. This work provides guidance for the design of materials and device architectures that maximize OPV cell power conversion efficiency.Keywords
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