钙钛矿(结构)
材料科学
能量转换效率
短路
开路电压
光伏系统
平面的
纹理(宇宙学)
电流密度
光学
光电子学
电压
电气工程
计算机科学
化学
结晶学
计算机图形学(图像)
物理
量子力学
人工智能
图像(数学)
工程类
作者
Ahmed Farag,Raphael Schmager,Paul Faßl,Philipp Noack,Bianca Wattenberg,Torsten Dippell,Ulrich W. Paetzold
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2022-05-25
卷期号:5 (6): 6700-6708
被引量:9
标识
DOI:10.1021/acsaem.1c04028
摘要
Light management is key to high-performance solar cells, particularly to monolithic perovskite/Si tandem solar cells and in real field applications. Random pyramidal textures of commercial Si solar cells (height ∼2–5 μm) allow for efficient light harvesting; however, solution processing of conventional perovskite thin films (thickness ∼0.5 μm) over these large textures exhibits bad coverage, resulting in shunting paths. In response to this challenge, we present high-efficiency perovskite solar cells (PSCs) processed on replicated industry-applicable random pyramidal textures with a smaller pyramid size of ∼1–2 μm. As a first step, we develop planar PSCs with close to micrometer thick perovskite absorber layers that maintain efficient charge carrier extraction by using a Lewis base additive and exhibit a power conversion efficiency of up to 18%. Employing these thick films in textured PSCs with inverted pyramids improves the light management as compared to the planar reference, with the AM 1.5G weighted reflectance being reduced from 9.9 to 5.2%. The reduced broadband reflectance in conjunction with enhanced light trapping increases the current generation by 7.7% relative, which corresponds to 87.3% of the maximum attainable short-circuit current density. In addition, we maintain a high fill factor and open-circuit voltage comparable to that of the planar reference PSC despite the increased surface area of the texture. Thereby, our champion textured PSC exhibits a stabilized power output of 18.7% at maximum power point tracking for 5 min. Finally, the textured PSCs also exhibit improved current generation for all angles of incidence, emphasizing their advantages at realistic irradiation conditions and for bifacial applications.
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