Cesium Lead Inorganic Solar Cell with Efficiency beyond 18% via Reduced Charge Recombination
Cesium Lead Inorganic Solar Cell with Efficiency beyond 18% via Reduced Charge Recombination
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铯%20铅%20无机%20太阳能%20电池%20with%20效率%20超越%2018%%20via%20减少%20电荷%20重组
DOI：
10.1002/adma.201905143
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发表时间：
2019
影响因子：
29.4
通讯作者：
You Jingbi
中科院分区：
文献类型：
--
作者：
Ye Qiufeng;Zhao Yang;Mu Shaiqiang;Ma Fei;Gao Feng;Chu Zema;Yin Zhigang;Gao Pingqi;Zhang Xingwang;You Jingbi
铯基无机钙钛矿太阳能电池（PSCs）因其提高器件稳定性的潜力而前景广阔。然而，由于电荷复合可能造成较大的开路电压（VOC）损失，无机PSCs的功率转换效率仍然低于混合PSCs。在电子传输层sno2上使用绝缘的分流阻断层氟化锂，可以更好地与CsPbI3 - xbrx3的导带最小值的能级匹配，也可以实现界面缺陷钝化。此外，通过在CsPbI3‐xbrx前驱体中加入氯化铅，钙钛矿薄膜的结晶度显著提高，钙钛矿中的电荷复合受到抑制。结果表明，优化后的带隙为1.77 eV的CsPbI3‐xBrxPSCs表现出优异的性能，最佳vocs高达1.25 V，效率为18.64%。同时，CsPbI3 - xBrxPSCs在1000小时的连续1太阳等效光照下具有低于6%的光稳定性。
Cesium‐based inorganic perovskite solar cells (PSCs) are promising due to their potential for improving device stability. However, the power conversion efficiency of the inorganic PSCs is still low compared with the hybrid PSCs due to the large open‐circuit voltage (VOC) loss possibly caused by charge recombination. The use of an insulated shunt‐blocking layer lithium fluoride on electron transport layer SnO2for better energy level alignment with the conduction band minimum of the CsPbI3‐xBrxand also for interface defect passivation is reported. In addition, by incorporating lead chloride in CsPbI3‐xBrxprecursor, the perovskite film crystallinity is significantly enhanced and the charge recombination in perovksite is suppressed. As a result, optimized CsPbI3‐xBrxPSCs with a band gap of 1.77 eV exhibit excellent performance with the bestVOCas high as 1.25 V and an efficiency of 18.64%. Meanwhile, a high photostability with a less than 6% efficiency drop is achieved for CsPbI3‐xBrxPSCs under continuous 1 sun equivalent illumination over 1000 h.