Heterojunction‐Depleted Lead‐Free Perovskite Solar Cells with Coarse‐Grained B‐γ‐CsSnI3 Thin Films
Heterojunction‐Depleted Lead‐Free Perovskite Solar Cells with Coarse‐Grained B‐γ‐CsSnI3 Thin Films
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DOI：
10.1002/aenm.201601130
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发表时间：
2016-12
影响因子：
27.8
通讯作者：
Ning Wang;Yuanyuan Zhou;Minggang Ju;Hector F. Garces;T. Ding;S. Pang;Xiaoqin Zeng;N. Padture
中科院分区：
文献类型：
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作者：
Ning Wang;Yuanyuan Zhou;Minggang Ju;Hector F. Garces;T. Ding;S. Pang;Xiaoqin Zeng;N. Padture
永久性太阳能电池（PSC）已经成为一种突破性的光伏技术，为低成本，高效率的可再生发电带来了前所未有的希望。然而，与最先进的含铅PSC相关的潜在毒性已成为一个主要问题。过去在开发无铅PSC方面的研究取得了好坏参半的成功。在此，证明了粗晶粒B-γ-CsSnI 3钙钛矿薄膜作为高效无铅PSC的光吸收剂的前景。这里采用的B-γ-CsSnI 3钙钛矿晶粒的热驱动固态粗化伴随着其晶体结构中锡空位浓度的增加，如第一原理计算所支持的。这些B-γ-CsSnI 3薄膜的高效光伏操作的最佳器件架构，确定通过探索几个器件架构。通过对B-γ-CsSnI 3晶粒粗化的调节，结合使用最佳PSC结构，在不使用任何添加剂的情况下实现了功率转换效率高达3.31%的平面异质结耗尽B-γ-CsSnI 3 PSC。所展示的策略为开发未来的高性能无铅PV提供了指导和前景。
Perovskite solar cells (PSCs) have been emerging as a breakthrough photovoltaic technology, holding unprecedented promise for low‐cost, high‐efficiency renewable electricity generation. However, potential toxicity associated with the state‐of‐the‐art lead‐containing PSCs has become a major concern. The past research in the development of lead‐free PSCs has met with mixed success. Herein, the promise of coarse‐grained B‐γ‐CsSnI3 perovskite thin films as light absorber for efficient lead‐free PSCs is demonstrated. Thermally‐driven solid‐state coarsening of B‐γ‐CsSnI3 perovskite grains employed here is accompanied by an increase of tin‐vacancy concentration in their crystal structure, as supported by first‐principles calculations. The optimal device architecture for the efficient photovoltaic operation of these B‐γ‐CsSnI3 thin films is identified through exploration of several device architectures. Via modulation of the B‐γ‐CsSnI3 grain coarsening, together with the use of the optimal PSC architecture, planar heterojunction‐depleted B‐γ‐CsSnI3 PSCs with power conversion efficiency up to 3.31% are achieved without the use of any additives. The demonstrated strategies provide guidelines and prospects for developing future high‐performance lead‐free PVs.