Abstract
Abstract Plasmonic effects of metal nanostructures have been widely explored to increase light absorption in polymer solar cells (PSCs). High absorption enhancement in a broad spectral range is highly desirable to boost the efficiency of PSCs. In this study, we numerically demonstrate broadband active layer absorption enhancement using plasmonic effects of multi-positional Ag nanospheres (Ag NSs). The Ag NSs were included simultaneously in two different locations, one at the top portion of active layer and the other at anode buffer layer/active layer interface. A high absorption enhancement of 66% was achieved in an 80 nm thick active layer by optimizing size and period of Ag NSs. The effect of active layer thickness on absorption enhancement has also been investigated. Large near-field enhancement around the NSs and efficient trapping of light within the active layer were found to be responsible for the high absorption enhancement.
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