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Proceedings Paper

Theoretical studies of effects of 2D plasmonic grating on electrical properties of organic solar cells
Author(s): Wei E. I. Sha; Wallace C. H. Choy; Weng Cho Chew
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Paper Abstract

Although various optical designs and physical mechanisms have been studied both experimentally and theoretically to improve the optical absorption of organic solar cells (OSCs) by incorporating metallic nanostructures, the effects of plasmonic nanostructures on the electrical properties of OSCs is still not fully understood. Hence, it is highly desirable to study the changes of electrical properties induced by plasmonic structures and the corresponding physics for OSCs. In this work, we develop a multiphysics model for plasmonic OSCs by solving the Maxwell’s equations and semiconductor equations (Poisson, continuity, and drift-diffusion equations) with unified finite-difference method. Both the optical and electrical properties of OSCs incorporating a 2D metallic grating anode are investigated. For typical active polymer materials, low hole mobility, which is about one magnitude smaller than electron mobility, dominates the electrical property of OSCs. Since surface plasmon resonances excited by the metallic grating will produce concentrated near-field penetrated into the active polymer layer and decayed exponentially away from the metal-polymer interface, a significantly nonuniform and extremely high exciton generation rate is obtained near the grating. Interestingly, the reduced recombination loss and the increased open-circuit voltage can be achieved in plasmonic OSCs. The physical origin of the phenomena lies at direct hole collections to the metallic grating anode with a short transport path. In comparison with the plasmonic OSC, the hole transport in a multilayer planar OSC experiences a long transport path and time because the standard planar OSC has a high exciton generation rate at the transparent front cathode. The unveiled multiphysics is particularly helpful for designing high-performance plasmonic OSCs.

Paper Details

Date Published: 13 September 2012
PDF: 4 pages
Proc. SPIE 8477, Organic Photovoltaics XIII, 847714 (13 September 2012); doi: 10.1117/12.929498
Show Author Affiliations
Wei E. I. Sha, The Univ. of Hong Kong (Hong Kong, China)
Wallace C. H. Choy, The Univ. of Hong Kong (Hong Kong, China)
Weng Cho Chew, The Univ. of Hong Kong (Hong Kong, China)
Univ. of Illinois, Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 8477:
Organic Photovoltaics XIII
Zakya H. Kafafi; Christoph J. Brabec; Paul A. Lane, Editor(s)

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