The optoelectronic role of chlorine in CH3NH3PbI3(Cl)-based perovskite solar cells.
The optoelectronic role of chlorine in CH3NH3PbI3(Cl)-based perovskite solar cells.
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DOI：
10.1038/ncomms8269
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发表时间：
2015-06-12
影响因子：
16.6
通讯作者：
Yang, Yang
中科院分区：
文献类型：
--
作者：
Chen, Qi;Zhou, Huanping;Fang, Yihao;Stieg, Adam Z.;Song, Tze-Bin;Wang, Hsin-Hua;Xu, Xiaobao;Liu, Yongsheng;Lu, Shirong;You, Jingbi;Sun, Pengyu;Mckay, Jeff;Goorsky, Mark S.;Yang, Yang
钙钛矿光伏提供了极低成本，易于加工和高设备性能的令人信服的组合。原型CH3NH3PbI3的光电性能可以通过引入其他外源离子进一步调整。具体来说，氯的掺入已经被证明会影响钙钛矿薄膜的形态发展，从而改善光电特性，提高效率。然而，这需要深入了解外在卤化物的作用，特别是在薄膜生长过程中没有不可预测的形态影响的情况下。在这里，我们报告了一种有效的策略来研究外源离子在光电性能背景下的作用，其中与器件性能密切相关的形态因素大多是解耦的。氯的掺入主要改善了载流子在异质结界面上的输运，而不是在钙钛矿晶体内的输运。根据该协议进一步优化，太阳能电池的功率转换效率达到17.91%。氯掺入CH3NH3PbI3提高了太阳能电池的性能，但其光电作用尚不清楚。在这里，作者提出了一种解耦形态影响的策略，以揭示氯的掺入影响载流子在异质结界面上的传输，而不是在钙钛矿晶体内。
Perovskite photovoltaics offer a compelling combination of extremely low-cost, ease of processing and high device performance. The optoelectronic properties of the prototypical CH3NH3PbI3 can be further adjusted by introducing other extrinsic ions. Specifically, chlorine incorporation has been shown to affect the morphological development of perovksite films, which results in improved optoelectronic characteristics for high efficiency. However, it requires a deep understanding to the role of extrinsic halide, especially in the absence of unpredictable morphological influence during film growth. Here we report an effective strategy to investigate the role of the extrinsic ion in the context of optoelectronic properties, in which the morphological factors that closely correlate to device performance are mostly decoupled. The chlorine incorporation is found to mainly improve the carrier transport across the heterojunction interfaces, rather than within the perovskite crystals. Further optimization according this protocol leads to solar cells achieving power conversion efficiency of 17.91%. Chlorine incorporation into CH3NH3PbI3 improves solar cell performance, but its optoelectronic role is still unclear. Here the authors present a strategy that decouples the morphological impact, to reveal that chlorine incorporation affects carrier transport across the heterojunction interface rather than within the perovskite crystal.
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