Design and fabrication of a plasmonic fishnet structure for the enhancement of light trapping in thin film solar cells

Incorporating plasmonic structures within the back spacer of thin film solar cells (TFSCs) is an efficient way to improve the cell parameters. The fishnet structure embedded in the back spacer of TFSC results in an enhancement of light absorption in a-Si. The fishnet structure made up of silver was fabricated using electron beam lithography and thermal evaporation. The final fabricated structure optically resembles a TFSC. The results predicted by numerical simulations were reproduced experimentally on a fabricated sample. We show that the reflection is reduced by the presence of the fishnet structure thereby verifying enhanced absorption.