Graded bandgap perovskite solar cells(Retracted article. See vol. 17, pg. 204, 2018)
Graded bandgap perovskite solar cells(Retracted article. See vol. 17, pg. 204, 2018)
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DOI：
10.1038/nmat4795
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发表时间：
2017-05-01
期刊：
影响因子：
41.2
通讯作者：
Zettl, Alex
中科院分区：
文献类型：
--
作者：
Ergen, Onur;Gilbert, S. Matt;Zettl, Alex
有机-无机卤化物钙钛矿材料已经成为传统太阳能电池构建块的有吸引力的替代品。它们的高光吸收系数和长漫射长度表明高功率转换效率（1-5），并且实际上基于钙钛矿的单带隙和串联太阳能电池设计已经产生了令人印象深刻的性能（1-16）。进一步提高太阳光谱利用率的一种方法是渐变带隙，但这在以前对于钙钛矿还没有实现。在这项研究中，我们展示了梯度带隙钙钛矿太阳能电池，稳态转换效率平均为18.4%，最高为21.7%，所有电池都没有反射涂层。实验数据的分析产生类似于75%的高填充因子和高达42.1 mA cm（2）的高短路电流密度。该电池基于两个钙钛矿层（CH 3 NH3 SnI 3和CH 3 NH3 PbI 3-xBrx）的架构，结合GaN、单层六方氮化硼和石墨烯气凝胶。
Organic-inorganic halide perovskite materials have emerged as attractive alternatives to conventional solar cell building blocks. Their high light absorption coefficients and long diffusion lengths suggest high power conversion efficiencies(1-5), and indeed perovskite-based single bandgap and tandem solar cell designs have yielded impressive performances(1-16). One approach to further enhance solar spectrum utilization is the graded bandgap, but this has not been previously achieved for perovskites. In this study, we demonstrate graded bandgap perovskite solar cells with steady-state conversion efficiencies averaging 18.4%, with a best of 21.7%, all without reflective coatings. An analysis of the experimental data yields high fill factors of similar to 75% and high short-circuit current densities up to 42.1 mA cm(2). The cells are based on an architecture of two perovskite layers (CH3NH3SnI3 and CH3NH3PbI3-xBrx), incorporating GaN, monolayer hexagonal boron nitride, and graphene aerogel.