Qarony Wayesh, Hossain Mohammad I, Jovanov Vladislav, Salleo Alberto, Knipp Dietmar, Tsang Yuen Hong
Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, 999077 Kowloon, Hong Kong.
Research Center for Functional Materials and Nanomolecular Science, Jacobs University Bremen, 28759 Bremen, Germany.
ACS Appl Mater Interfaces. 2020 Apr 1;12(13):15080-15086. doi: 10.1021/acsami.9b21985. Epub 2020 Mar 18.
Perovskite/silicon tandem solar cells are considered as one of the cost-effective solutions for determining high energy conversion efficiencies. Efficient photon management allows improving light incoupling in solar cells by reducing optical losses. The optics relies upon the interface morphology, and consequently, the growth mechanism of the top cell on the bottom cell is crucial for the implementation of efficient perovskite/silicon tandem solar cells. To describe the interface morphologies of perovskite/silicon tandem solar cells, a three-dimensional surface algorithm is used that allows investigating the perovskite solar cells deposited on the textured crystalline silicon solar cells. We distinguish between two extreme cases in which the film grows only in the direction of the substrate normal or in the direction of the local surface normal. The growth mode has significant influence on the film roughness, the effective thickness of the film, the optics of the solar cell, and the photovoltaic parameters. The optics is investigated by finite-differencetime-domain simulations. The influence of the interface morphology on the photovoltaic parameters is discussed, and guidelines are provided to reach high short-circuit current density and energy conversion efficiency.
钙钛矿/硅串联太阳能电池被认为是实现高能量转换效率的经济高效解决方案之一。高效的光子管理可通过减少光学损耗来改善太阳能电池中的光耦合。光学性能取决于界面形态，因此，顶部电池在底部电池上的生长机制对于实现高效的钙钛矿/硅串联太阳能电池至关重要。为了描述钙钛矿/硅串联太阳能电池的界面形态，使用了一种三维表面算法，该算法允许研究沉积在纹理化晶体硅太阳能电池上的钙钛矿太阳能电池。我们区分了两种极端情况，即薄膜仅沿衬底法线方向生长或沿局部表面法线方向生长。生长模式对薄膜粗糙度、薄膜有效厚度、太阳能电池的光学性能以及光伏参数有重大影响。通过有限时域差分模拟来研究光学性能。讨论了界面形态对光伏参数的影响，并提供了实现高短路电流密度和能量转换效率的指导原则。
