Perovskite Solar Cells with Enhanced Fill Factors Using Polymer-Capped Solvent Annealing
Perovskite Solar Cells with Enhanced Fill Factors Using Polymer-Capped Solvent Annealing
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DOI：
10.1021/acsaem.0c00854
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发表时间：
2020-08-24
影响因子：
6.4
通讯作者：
Taylor, Andre D.
中科院分区：
文献类型：
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作者：
Kong, Jaemin;Wang, Hanyu;Taylor, Andre D.
尽管钙钛矿太阳能电池的功率转换效率有了巨大的提高，但该技术仍然受到填充因子的限制，大约在80%左右。在这里，我们报告了钙钛矿太阳能电池，其具有85%的极高填充因子和增强的开路电压，而不牺牲短路电流，通过热空气鼓风机辅助的聚合物封端的溶剂退火过程。在溶剂退火过程中，钙钛矿表面发生团聚，钙钛矿晶粒聚集成具有增大的α相微晶的微米级簇，而δ相同时消失。优化的结构减少了钙钛矿层中的能量无序和陷阱辅助复合，从而使效率从18.2%提高到19.8%，并提高了器件寿命。我们的研究结果为提高钙钛矿太阳能电池的器件效率和稳定性提供了一条途径，并有可能刺激光电器件中可扩展多晶钙钛矿层制造的研究。
Despite huge improvements in power conversion efficiencies of perovskite solar cells, the technology is still limited by fill factors at around 80%. Here, we report perovskite solar cells having exceptionally high fill factors of 85% and enhanced opencircuit voltage without sacrificing short-circuit current through a polymer-capped solvent-annealing process assisted by a hot air blower. During the solvent-annealing, the perovskite surface flattens and the perovskite grains agglomerate into micrometer-sized clusters having enlarged alpha-phase crystallites, while the delta-phase simultaneously disappears. The optimized structure reduces energetic disorder and trap-assisted recombination in the perovskite layer, resulting in an enhanced efficiency from 18.2% to 19.8% and improved device lifetime. Our results provide a pathway to increase the device efficiency and stability of perovskite solar cells, and have the potential to stimulate research on scalable polycrystal perovskite layer fabrication in optoelectronic devices.