材料科学
钙钛矿(结构)
掺杂剂
扩散
光伏系统
甲脒
钙钛矿太阳能电池
光电子学
带材弯曲
太阳能电池
化学物理
工程物理
带隙
能量转换效率
纳米技术
兴奋剂
化学工程
热力学
化学
物理
电气工程
工程类
作者
Ziru Huang,Mingyang Wei,Andrew H. Proppe,Hao Chen,Bin Chen,Yi Hou,Zhijun Ning,Edward H. Sargent
标识
DOI:10.1002/adfm.202010572
摘要
Perovskites with the multi-cation composition of cesium (Cs), methylammonium (MA), and formamidinium (FA) (CsMAFA) are pursued for their high power conversion efficiencies, but they are limited by their thermal stability. To withstand damp-heat accelerated aging MA-free compositions such as CsFA are of interest, but these exhibit lower carrier diffusion lengths and thus lesser performance in photovoltaic devices. A band engineering strategy that overcomes limited carrier diffusion within inverted perovskite solar cells based on CsFA is reported. A joint experimental-computational study shows that treating the perovskite with an n-type molecular dopant increases band bending, shaping the electric field across the active layer to overcome limited diffusive transport. Using this strategy, CsFA solar cell devices with stabilized power conversion efficiencies of 20.3%, a high value for devices using CsFA active layers, are fabricated.
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