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Published on: November 9, 2015
Influence of Ag Nanostructure Location on the Absorption Enhancement in Polymer Solar Cells
Abhijith T Nair1, Shamjid P Palappra1, V S Reddy1
1Organic and Nanoelectronics Laboratory, Department of Physics , National Institute of Technology Calicut (NITC) , Calicut 673 601 , Kerala , India.
Abstract:
The optical absorption enhancement in Ag nanocube (NC)- and nanosphere (NS)-embedded poly[ N-9'-heptadecanyl-2,7-carbazole- alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)]:[6,6]-phenyl C71-butyric acid methyl ester active layer was calculated using three-dimensional finite-difference time domain simulations. The simulations were carried out by incorporating Ag nanostructures as a two-dimensional array at various locations in the active layer matrix. High absorption enhancements of 53 and 61% were achieved with NSs and NCs, respectively, when they were incorporated at the top portion of the active layer. The influence of various passivation layers on the absorption enhancement was also investigated. The simulation results revealed that the absorption enhancement is mainly due to the near-field enhancement around the nanostructures and the backward reflection of incident light from the nanostructure array.
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