Bifunctional Dye Molecule in All‐Inorganic CsPbIBr 2 Perovskite Solar Cells with Efficiency Exceeding 10%
Bifunctional Dye Molecule in All‐Inorganic CsPbIBr 2 Perovskite Solar Cells with Efficiency Exceeding 10%
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DOI：
10.1002/solr.201900212
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发表时间：
2019-09
期刊：
影响因子：
7.9
通讯作者：
Shuzhang Yang;Zhanglin Guo;Liguo Gao;Fengyang Yu;Chu Zhang;M. Fan;G. Wei;T. Ma
中科院分区：
文献类型：
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作者：
Shuzhang Yang;Zhanglin Guo;Liguo Gao;Fengyang Yu;Chu Zhang;M. Fan;G. Wei;T. Ma
无机卤化铅钙钛矿由于其比有机-无机杂化钙钛矿材料更好的热稳定性而受到越来越多的关注。因此，低功率转换效率（PCE）是无机卤化铅钙钛矿太阳能电池（PSC）的关键问题。这主要是由于器件中的带隙更宽和能量损失（Eloss）更大。为了解决这个问题，本文演示了使用 5,15-双（2,6-二辛氧基苯基）-10-（双（4-己基苯基）-氨基-20-4-羧基苯基乙炔基）卟啉]锌（II）（YD2-o-C8）染料的染料分子辅助工程。结果表明，该分子具有双功能效应，不仅可以作为CsPbIBr2的共敏化层，具有更宽的吸收光谱，而且可以通过界面钝化降低Eloss。具体而言，光敏层的光吸收范围从600nm拓宽至接近680nm。同时，界面电荷复合大大减少。优化后，冠军的 PCE 从 7.02% 提高到 10.13%，并实现了创纪录的高开路电压 (VOC) 1.37 V 和短路电流 (JSC) 12.05 mA cm−2。这项研究为提高无机PSC的效率开辟了一种简单有效的方法。
Inorganic lead halide perovskites are attracting increasing attention due to their much better thermal stability than the organic–inorganic hybrid perovskite materials. Thus, the low power conversion efficiency (PCE) is a key issue for the inorganic lead halide perovskite solar cells (PSCs). This is mainly due to their wider bandgap and larger energy loss (Eloss) in the devices. Herein, for solving this issue, a dye molecule‐assisted engineering using the dye of 5,15‐bis(2,6‐dioctoxyphenyl)‐10‐(bis(4‐hexylphenyl)‐amino‐20‐4‐carboxyphenylethynyl)porphyrinato]zinc(II) (YD2‐o‐C8) is demonstrated. Results indicate that this molecule has a bifunctional effect, not only as a co‐sensitization layer for CsPbIBr2with broader absorption spectrum but also reduces theElossby interface passivation. Specifically, the light absorption range of the photoactive layer is broadened from 600 to nearly 680 nm. At the same time, the interfacial charge recombination is highly reduced. After optimizing, the champion PCE is enhanced from 7.02% to 10.13%, and record‐high open‐circuit voltage (VOC) of 1.37 V and short‐circuit currents (JSC) of 12.05 mA cm−2are achieved. This study opens a simple and efficient way to improve the efficiency of inorganic PSCs.