Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4891365
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Funding
- Office of Naval Research [N00014-14-1-0170, N00014-11-1-0300]
- State of Washington through the University of Washington Clean Energy Institute
- Asian Office of Aerospace RD [FA2386-11-1-4072]
- Portuguese Foundation for Science and Technology (FCT) [SFRH/BPD/71816/2010]
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We use a combination of experiment and modeling to explore the promise and limitations of using plasmon-resonant metal nanoparticles to enhance the device performance of organic photovoltaics (OPVs). We focus on optical properties typical of the current generation of low-bandgap donor polymers blended with the fullerene (6,6)-phenyl C-71-butyric acid methyl ester (PC71BM) and use the polymer poly(indacenodithiophene-co-phenanthro[9,10-b] quinoxaline) (PIDT-PhanQ) as our test case. We model the optical properties and performance of these devices both in the presence and absence of a variety of colloidal silver nanoparticles. We show that for these materials, device performance is sensitive to the relative z-position and the density of nanoparticles inside the active layer. Using conservative estimates of the internal quantum efficiency for the PIDT-PhanQ/PC71BM blend, we calculate that optimally placed silver nanoparticles could yield an enhancement in short-circuit current density of over 31% when used with similar to 80-nm-thick active layers, resulting in an absolute increase in power conversion efficiency of up to similar to 2% for the device based on optical engineering. (C) 2014 AIP Publishing LLC.
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