Journal
ACS PHOTONICS
Volume 5, Issue 4, Pages 1440-1452Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b01390
Keywords
organic photovoltaics; surface plasmon resonance; metal nanoparticles
Categories
Funding
- European Union Program through the Project SMARTONICS [310229]
- EPSRC [EP/L02263X/1]
- Engineering and Physical Sciences Research Council [EP/L02263X/1] Funding Source: researchfish
- EPSRC [EP/L02263X/1] Funding Source: UKRI
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Incorporating plasmonic nanoparticles in organic photovoltaic (OPV) devices can increase the optical thickness of the organic absorber layer while keeping its physical thickness small. However, trade-offs between various structure parameters have caused contradictions regarding the effectiveness of plasmonics in the literature, that have somewhat stunted the progressing of a unified theoretical understanding for practical applications. We examine the optical enhancement mechanisms of practical PCDTBT:PC70BM OPV cells incorporating metal nano particles. The plasmonic near- and far-field contributions are differentiated, with spectrum- and space-wide current enhancements found in the plasmon scattering regime and spectrum- and space-specific current enhancements in the near-field regime. A remarkable system complexity is revealed, where the plasmonic enhancement trends change and even reverse by simple changes in the device geometry. This accounts for many of the contradictory results published in the literature on plasmonic effects in OPVs. By exploring the full structural parameter phase-space we are able to now propose a unified representation that intuitively explains literature findings and trends. Our results show that an already optimized PCDTBT:PC70BM cell can be further optically enhanced by plasmonic effects by at least 20% with the incorporation of Ag nanoparticles.
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