Size effects of metal nanoparticles embedded in a buffer layer of organic photovoltaics on plasmonic absorption enhancement
- Size effects of metal nanoparticles embedded in a buffer layer of organic photovoltaics on plasmonic absorption enhancement
- 김인호; 이택성; 정두석; 이욱성; 이경석
- Plasmonics; Organic Photovoltaics; Metal nanoparticles
- Issue Date
- Journal of physics D, applied physics
- VOL 45, NO 6, 065101-1-065101-6
- The effects of Au or Ag nanoparticles on optical absorption enhancement of organic
photovoltaics based on blended poly(3-hexylthiophene) : phyenyl-C61-butyric acid methyl
ester (P3HT : PCBM) were investigated using a finite-difference-time-domain method. The
spherical metal nanoparticles were embedded in a buffer layer of thickness 20 nm and their
size was varied from 10 to 50 nm. The metal nanoparticles with diameter 10–20 nm offered
negligible absorption enhancement in the active layer. Unlike those short metal nanoparticles,
the incorporation of metal nanoparticles taller than the buffer layer led to a significant
absorption enhancement by plasmonic resonance especially in the case of Ag nanoparticles.
Ag nanoparticles gave broader and stronger absorption enhancement in the active layer than
Au nanoparticles. An enhancement of 34% in the optical absorption of the active layer was
observed with Ag nanoparticles of 50 nm diameter at 10% coverage. The electric field
distributions around metal nanoparticles, their self-absorption and the active layer thickness
dependence on the absorption enhancement were studied.
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