近日，浙江大学的杨德仁&余学功及其研究小组与苏州大学的张晓宏等人合作并取得一项新进展。经过不懈努力，他们研制出具有铜硫氰酸盐嵌入钙钛矿的纹理化硅基高效稳定钙钛矿-硅叠层太阳能电池。相关研究成果已于2024年11月4日在国际知名学术期刊《自然—光子学》上发表。
本研究通过共沉积硫氰酸亚铜和钙钛矿来解决上述挑战，其中嵌入的硫氰酸亚铜同时实现了有效的钙钛矿晶界钝化和高效的空穴收集，形成了局部的空穴收集接触。所制备的单片钙钛矿/硅叠层器件在1平方厘米的面积上，实现了31.46%的认证功率转换效率。
除了良好的可重复性和可扩展性外，该叠层电池还表现出优异的稳定性，在45°C下进行约1200小时的最大功率点跟踪后，仍保持了93.8%的初始功率转换效率，在85°C和85%相对湿度下进行超过1000小时的湿热测试后，保持了90.2%的效率。
据悉，单片钙钛矿/硅叠层太阳能电池已展现出良好的性能。然而，钙钛矿顶电池中常用的空穴传输层存在缺陷，如非共形沉积或在纹理化硅底电池上钙钛矿的去湿现象。这些问题对器件的可重复性、可扩展性以及商业化应用造成了不利影响。
附：英文原文
Title: Efficient and stable perovskite-silicon tandem solar cells with copper thiocyanate-embedded perovskite on textured silicon
Author: Kan, Chenxia, Hang, Pengjie, Wang, Shibo, Li, Biao, Yu, Xuegong, Yang, Xinbo, Yao, Yuxin, Shi, Wei, De Wolf, Stefaan, Yin, Jun, Zhang, Daoyong, Ding, Degong, Yu, Cao, Yang, Shaofei, Zhang, Jiteng, Yao, Jia, Zhang, Xiaohong, Yang, Deren
Issue&Volume: 2024-11-04
Abstract: Monolithic perovskite/silicon tandem solar cells have achieved promising performance. However, hole transport layers that are commonly used for the perovskite top cell suffer from defects, non-conformal deposition or de-wetting of the overlying perovskite on the textured silicon bottom cells. These issues detrimentally affect device reproducibility and scalability, and thus commercialization. Here we address these challenges through the co-deposition of copper(I) thiocyanate and perovskite, where effective perovskite grain boundary passivation and efficient hole collection are simultaneously achieved by the embedded copper(I) thiocyanate, which creates local hole-collecting contacts. Fabricated monolithic perovskite/silicon tandem devices achieve a certified power conversion efficiency of 31.46% for 1cm2 area devices. Aside from good reproducibility and scalability, our tandem cells exhibit excellent stability, maintaining 93.8% of their initial power conversion efficiency after about 1,200h of maximum power point tracking at 45°C, and 90.2% after over 1,000h of damp-heat testing at 85°C and 85% relative humidity.
DOI: 10.1038/s41566-024-01561-5
Source: https://www.nature.com/articles/s41566-024-01561-5