Improved Photovoltaic Performances of Lead-Free Cs 2 AgBiBr 6 Double Perovskite Solar Cells Incorporating Tetracene as Co-Hole Transport Layer
Improved Photovoltaic Performances of Lead-Free Cs 2 AgBiBr 6 Double Perovskite Solar Cells Incorporating Tetracene as Co-Hole Transport Layer
复制标题
采用并四苯作为共空穴传输层的无铅 Cs 2 AgBiBr 6 双钙钛矿太阳能电池的光伏性能改进
DOI：
10.1002/solr.202300391
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发表时间：
2023
期刊：
影响因子：
7.9
通讯作者：
Daem N
中科院分区：
文献类型：
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作者：
Daem N
近年来，Cs2 AgBiBr 6双钙钛矿化合物作为能够对抗传统含铅太阳能电池固有的污染，有害和氧/湿度敏感问题的有前途的候选物越来越多地被研究。Cs2 AgBiBr 6太阳能电池表现出高的光吸收系数、低毒性和重要的结构稳定性，但仍然存在对低能光子的有限吸收、低载流子迁移率和由缺陷态引起的有限载流子寿命的问题。在本文中，首次在基于Cs2 AgBiBr 6的光伏架构内引入并四苯的分子层：在双钙钛矿光吸收剂和螺环-OMeBr空穴传输材料之间的界面处并入并四苯，从而允许在太阳能电池架构内适当分级的能带级联，这最终改善了界面电荷转移并减少了电荷复合。因此，与不含并四苯的配置相比，光伏器件的性能得到了增强，开路电压为1.1 V（vs. 1.0 V），电流密度为2.5 mA cm−2（vs. 1.9 mA cm−2），光电转换效率为1.7%（vs. 1.3%），滞后行为减少。
Cs2AgBiBr6double perovskite compounds are increasingly studied in recent years as promising candidates able to counter polluting, harmful, and oxygen‐/moisture‐sensitive issues intrinsic to traditional lead‐containing solar cells. Exhibiting high optical absorption coefficient, low toxicity, and important structural stability, Cs2AgBiBr6solar cells still suffer from limited absorption of low‐energy photons, low carrier mobility, and limited carrier lifetimes induced by defect states. Herein, for the first time, a molecular layer of tetracene is introduced within a Cs2AgBiBr6‐based photovoltaic architecture: being incorporated at the interface between the double perovskite photoabsorber and spiro‐OMeTAD hole transport material, tetracene allows for a suitably graded cascade of energy bands within the solar cell architecture, which ultimately improves interfacial charge transfers and reduces charge recombination. The performances in photovoltaic devices are consequently enhanced versus tetracene‐free configurations, with champion values of open‐circuit voltages of 1.1 V (vs. 1.0 V), current densities of 2.5 mA cm−2(vs. 1.9 mA cm−2), and photoconversion efficiencies of 1.7% (vs. 1.3%) with reduced hysteretic behavior.