Fast Charge Diffusion in MAPb(I1-xBrx)(3) Films for High-Efficiency Solar Cells Revealed by Ultrafast Time-Resolved Reflectivity
Fast Charge Diffusion in MAPb(I1-xBrx)(3) Films for High-Efficiency Solar Cells Revealed by Ultrafast Time-Resolved Reflectivity
复制标题
超快时间分辨反射率揭示了高效太阳能电池 MAPb(I1-xBrx)(3) 薄膜中的快速电荷扩散
DOI：
10.1021/acs.jpca.9b00978
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发表时间：
2019
影响因子：
2.9
通讯作者：
Chen Jie
中科院分区：
文献类型：
--
作者：
Shi Wenjun;Wang Yong;Zhang Taiyang;Zhang Haijuan;Zhao Yixin;Chen Jie
Organometallic halide perovskite solar cells such as MAPbI3have shown great promise as a low-cost, high-efficiency photovoltaic candidate. Recent studies demonstrated that by substituting an appropriate amount I ions of MAPbI3with Br ions, the device performance parameters, such as moisture stability or power conversion efficiency, can be further optimized. In this study, using time-resolved optical reflectivity to track the carrier dynamics in MAPb(I1–xBrx)3films with different Br contents, we found that photocarriers in MAPb(I1–xBrx)3films withx= 0.01 and 0.02 diffuse much faster than those in films with other Br contents. We suggest that the faster charge carrier diffusion benefits from larger crystal grain size. As a result, this suppresses electron and hole recombination and increases the carrier extraction efficiency, in agreement with the higher power conversion efficiency reported previously.
