Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
The perovskite solar cells introduced in 2009 and attract the attention of many research groups in less than one decade. One of the important issues regarding these cells is light harvesting. In this work, we have used light-trapping structures (LTS) to improve the ability of the cell to confine more light in the active layer and thus, more absorbed light. Some of LTSs are based on photonic or plasmonic nano-structures. Depend on the configurations, these nano-structures can improve the light absorption in the cell. Our proposed structure is based on plasmonic nano-particles (NPs) to increase the light harvesting in the absorber layer. The plasmonic NPs create localized surface plasmon as a result of light interaction to free electrons and increase the intensity of the electromagnetic field. We have used plamonic nano-rings (NRs) that have three parameters to controlling, outer radius, inner radius and thickness. By accurate tuning of these parameters, plasmonic NR lead to high electromagnetic field intensity and thus high light absorption. For this reason, we have defined two aspect ratios, one for the proportionality of the outer radius to thickness and another for the proportionality of outer radius to the inner one. We have considered two cases, close-packed and non-close-packed NP array. According to the numerical simulation and by considering the best position of NRs in the active layer, the absorption increases in both close-packed and non-close-packed NP arrays and more lights have been confined around the NPs compared to the reference cell which is without any NPs. But, this increased absorption is not necessarily lead to greater efficiency because of the absorption loss due to the parasitic absorption.
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