Journal
ACS NANO
Volume 6, Issue 11, Pages 10024-10032Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn303725v
Keywords
localized surface plasmon resonance; metal nanoparticles; electron transfer; charge-induced plasmonic shift; light trapping; plasmon-enhanced solar cells; organic bulk heterojunction
Categories
Funding
- ONR
- AFOSR
- National Science Foundation [DMR 0449422, DMR 0520567, DMR 0120967]
- Portuguese Foundation for Science and Technology (FCT) [SFRH/BPD/71816/2010]
- NSF DMR [1005504]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1005504] Funding Source: National Science Foundation
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Plasmonic metal nanoparticles have been used to enhance the performance of thin-film devices such as organic photovoltaics based on polymer/fullerene blends. We show that silver nanoprisms accumulate long-lived negative charges when they are in contact with a photoexcited bulk heterojunction blend composed of poly(3-hexylthiophene)/phenyl-C61-butyric add methyl ester (P3HT/PCBM). We report both. the charge modulation and electroabsorption spectra of silver nanoprisms in solid-state, devices and compare these spectra with the photoinduced absorption spectra of P3HT/PCBM blends containing silver nanoprisms. We assign a previously unidentified peak in the photoinduced absorption spectra to the presence of photoinduced electrons on the silver nanoprisms. We show that coating the nanoprisms with a 23 nm thick insulating layer can completely inhibit this charging. These results may inform methods for limiting metal-mediated losses in plasmonic solar cells.
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