Approaching the Shockley-Queisser limit for fill factors in lead-tin mixed perovskite photovoltaics
Approaching the Shockley-Queisser limit for fill factors in lead-tin mixed perovskite photovoltaics
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DOI：
10.1039/c9ta10543c
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发表时间：
2020-01-14
影响因子：
11.9
通讯作者：
Silva, S. R. P.
中科院分区：
文献类型：
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作者：
Jayawardena, K. D. G. I.;Bandara, R. M. I.;Silva, S. R. P.
所有太阳能电池的性能都取决于电荷复合。一个更接近理想的复合动力学的结果，在改进的性能，填充因子接近基于肖克利-奎瑟分析的限制。众所周知，对于新兴的太阳能材料如钙钛矿，需要克服几个挑战以实现高填充因子，特别是对于大面积铅-锡混合钙钛矿太阳能电池。在这里，我们展示了一种策略，通过对具有0.43 cm（2）有效面积的设备用溴化胍对铅锡混合钙钛矿吸收剂进行后处理，实现80%以上的填充因子。这种溴化物后处理导致阳极和阴极界面处更有利的能带对准，从而实现更好的双极提取。由此产生的器件表现出83%的特殊填充因子，接近Shockley-Queisser极限，导致大面积器件的功率转换效率为14.4%。
The performance of all solar cells is dictated by charge recombination. A closer to ideal recombination dynamics results in improved performances, with fill factors approaching the limits based on Shockley-Queisser analysis. It is well known that for emerging solar materials such as perovskites, there are several challenges that need to be overcome to achieve high fill factors, particularly for large area lead-tin mixed perovskite solar cells. Here we demonstrate a strategy towards achieving fill factors above 80% through post-treatment of a lead-tin mixed perovskite absorber with guanidinium bromide for devices with an active area of 0.43 cm(2). This bromide post-treatment results in a more favorable band alignment at the anode and cathode interfaces, enabling better bipolar extraction. The resulting devices demonstrate an exceptional fill factor of 83%, approaching the Shockley-Queisser limit, resulting in a power conversion efficiency of 14.4% for large area devices.