title: Parasitic loss suppression in photonic and plasmonic photovoltaic light trapping structures.
abstract: In this paper, we examine the optical loss mechanisms and mitigation strategies in classical photovoltaic light trapping structures consisting of diffractive gratings integrated with a backside reflector, which couple normal incident solar radiation into guided modes in solar cells to enhance optical absorption. Parasitic absorption from metal or dielectric backside reflectors is identified to be a major loss contributor in such light trapping structures. We elucidate the optical loss mechanism based on the classical coupled mode theory. Further, a spacer design is proposed and validated through numerical simulations to significantly suppress the parasitic loss and improve solar cell performance.
authors: Yi
authors: Y
authors: Zou
authors: Xing
authors: X
authors: Sheng
authors: Kun
authors: K
authors: Xia
authors: Huayu
authors: H
authors: Fu
authors: Juejun
authors: J
authors: Hu