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Proceedings Paper

Surface plasmon enhanced infrared absorption in P3HT-based organic solar cells: the effect of infrared sensitizer (Presentation Recording)
Author(s): Sungmo Ahn; Alexandre M. Nardes; Devin Rourke; Jao van de Lagemaat; Nikos Kopidakis; Wounjhang Park
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Paper Abstract

We have theoretically and experimentally investigated the effects of Ag-grating electrode on the performance of polymer:fullerene based bulk heterojunction organic solar cells. First, an integrated numerical model has been developed, which is capable of describing both the optical and the electrical properties simultaneously. The Ag-grating patterned back electrode was then designed to enhance the absorption in sub-bandgap region of P3HT:PCBM binary devices. Laser interference lithography and metal lift-off technique were adopted to realize highly-uniform and large-area nanograting patterns. We measured almost 5 times enhancement of the external quantum efficiency at the surface plasmon resonance wavelength. However, the overall improvement in power conversion efficiency was not significant due to the low intrinsic absorption of active layer in this sub-bandgap region. We, then, investigated about the effect of surface plasmon on the ternary device of P3HT:Si-PCPDTBT:ICBA. It was demonstrated that the infrared absorption by the Si-PCPDTBT sensitizer can be substantially enhanced by matching the surface plasmon resonance to the sensitizer absorption band. Besides, we also observed an additional enhancement in the visible range which is due to the scattering effect of the gratings. An overall short-circuit current enhancement of up to 40% was predicted numerically. We have then fabricated the device by the lamination technique and observed a 30% increase in the short circuit current. Plasmon enhancement of sensitized organic solar cell presents a promising pathway to high-efficiency, broadband-absorbing polymer:fullerene bulk heterojunction organic solar cells.

Paper Details

Date Published: 5 October 2015
PDF: 1 pages
Proc. SPIE 9562, Next Generation Technologies for Solar Energy Conversion VI, 95620D (5 October 2015); doi: 10.1117/12.2188710
Show Author Affiliations
Sungmo Ahn, Univ. of Colorado at Boulder (United States)
Alexandre M. Nardes, National Renewable Energy Lab. (United States)
Devin Rourke, Univ. of Colorado at Boulder (United States)
Jao van de Lagemaat, National Renewable Energy Lab. (United States)
Nikos Kopidakis, National Renewable Energy Lab. (United States)
Wounjhang Park, Univ. of Colorado at Boulder (United States)


Published in SPIE Proceedings Vol. 9562:
Next Generation Technologies for Solar Energy Conversion VI
Oleg V. Sulima; Gavin Conibeer, Editor(s)

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