Long Electron-Hole Diffusion Length in High-Quality Lead-Free Double Perovskite Films
Long Electron-Hole Diffusion Length in High-Quality Lead-Free Double Perovskite Films
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DOI：
10.1002/adma.201706246
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发表时间：
2018-05-17
影响因子：
29.4
通讯作者：
Gao, Feng
中科院分区：
文献类型：
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作者：
Ning, Weihua;Wang, Feng;Gao, Feng
开发环境友好的钙钛矿对于解决铅基钙钛矿太阳能电池的毒性问题变得重要。在这里，展示了第一个使用平面结构的双钙钛矿（Cs2AgBiBr6）太阳能电池。所制备的Cs2AgBiBr6薄膜由直径等于薄膜厚度的高晶体质量晶粒组成，从而最大限度地减少了晶界长度和载流子复合。这些高质量的双钙钛矿薄膜显示出大于 100 nm 的长电子空穴扩散长度，从而能够制造平面结构双钙钛矿太阳能电池。由此产生的基于平面 TiO2 的太阳能电池的平均功率转换效率超过 1%。这项工作代表了实现环保太阳能电池的重要一步，对双钙钛矿在其他光电器件中的应用也具有重要意义。
Developing environmentally friendly perovskites has become important in solving the toxicity issue of lead-based perovskite solar cells. Here, the first double perovskite (Cs2AgBiBr6) solar cells using the planar structure are demonstrated. The prepared Cs2AgBiBr6 films are composed of high-crystal-quality grains with diameters equal to the film thickness, thus minimizing the grain boundary length and the carrier recombination. These high-quality double perovskite films show long electron-hole diffusion lengths greater than 100 nm, enabling the fabrication of planar structure double perovskite solar cells. The resulting solar cells based on planar TiO2 exhibit an average power conversion efficiency over 1%. This work represents an important step forward toward the realization of environmentally friendly solar cells and also has important implications for the applications of double perovskites in other optoelectronic devices.