Light management in perovskite-silicon tandem solar cells

• Ano de defesa: 2020
• Autor(a) principal: Rocha, Michel Gaglioni
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: células tandem; diffractive structures; estruturas difrativas; gerenciamento de luz; light management; perovskita; perovskite; silício; silicon; tandem cells
• Link de acesso: https://www.teses.usp.br/teses/disponiveis/18/18155/tde-30072025-085440/

The demand for efficient renewable energy sources has placed photovoltaic cells under the limelight in the last few years. The efficiency of single-juction silicon solar cells, however, is already approaching the theoretical limit of 30%. Tandem solar cells can overcome this limit, and already have reported efficiencies greater than 30% and theoretical limits about 52%. Tandem cells that combine perovskite with silicon are particularly promising due to its potential to deliver low cost and efficient solar cells. In order to promote an increase in the efficiency of these cells, light management techniques must be applied so as to minimize reflection and increase absorption in the cells. To achieve such requirements, structures capable of promoting light trapping and optimize the selectivity of the radiation directed to each cell are needed. Through numerical simulation this investigation analyses four cases of diffractive structures applied to tandem cells, aimed at light trapping into the perovskite and/or silicon layers. We show that light trapping is only useful to increase the efficiency of the tandem when it is used for the silicon layer.