Toward Development of Nanostructure Solar Cell: Role of Si in Copper-Zinc—Germanium—Sulfide/Selenide

Kesterite solar cells have gained significant popu-larity recently which are used as photovoltaic applications. On the other hand, their efficiency rates are less than 12.6 %. In kesterite solar cells, the utilization of nanostructure improves performance. In this work, the influence of the back surface field layer (BSF) on the performance of DQW (double quantum well) in copper-zinc-germanium-sulfide and selenide solar cells is investigated. A research study on mathematical analysis such as recombination through different loss mechanisms, electrical properties such as IV characteristics and optical properties such as IQE and EQE are explored. In a photovoltaic solar cell a novel structure CZGS/CZGSe DQW cell using Si as the BSF layer proposed, a remarkable efficiency of 24 % without defect and with defect 19 % is achieved.