Enhancing the performance of the perovskite solar cells by modifying the SnO2 electron transport layer
Enhancing the performance of the perovskite solar cells by modifying the SnO2 electron transport layer
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通过修饰 SnO2 电子传输层提高钙钛矿太阳能电池的性能
DOI：
10.1016/j.jpcs.2023.111532
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发表时间：
2023
影响因子：
4
通讯作者：
Li, Wenzhi
中科院分区：
文献类型：
--
作者：
Dahal, Biplav;Guo, Rui;Pathak, Rajesh;Rezaee, Melorina Dolafi;Elam, Jeffrey W.;Mane, Anil U.;Li, Wenzhi
氧化锡（SnO 2）电子传输层（ETL）在有机-无机钙钛矿太阳能电池（PSCs）的光转换效率（PCE）和稳定性中起着至关重要的作用。然而，SnO 2 ETL诱导的缺陷，如羟基，氧空位，暴露的Sn原子，和悬挂键阻碍器件的性能。在这项研究中，氯化铷（RbCl）已被用来修改的SnO 2 ETL。在RbCl改性的SnO 2 ETL上形成的Peroxide薄膜具有更好的结晶性，晶粒尺寸增大，晶界减少，光吸收增强。霍尔效应测试表明，RbCl修饰的SnO 2 ETL的载流子迁移率得到了提高，暗J-V曲线表明，RbCl修饰的SnO 2 ETL的电导率有所增加。X射线光电子能谱（XPS）的结果表明，钙钛矿层的表面缺陷钝化改性的SnO 2 ETL。RbCl改性的SnO 2 ETL基器件的PCE为19.35%，稳定性提高，而未改性的SnO 2 ETL的对照器件的PCE为17.18%。
The tin oxide (SnO2) electron transport layer (ETL) plays a vital role in the photo-conversion efficiency (PCE) and stability of organic-inorganic perovskite solar cells (PSCs). However, SnO2ETL-induced defects such as hydroxyl groups, oxygen vacancies, exposed Sn atoms, and dangling bonds hinder device performance. In this study, rubidium chloride (RbCl) has been used to modify the SnO2ETL. Perovskite film formed on the RbCl-modified SnO2ETL exhibits improved crystallinity with enlarged grain size and reduced grain boundaries and enhanced optical absorption. The Hall-effect measurements indicate the improved carrier mobility, and the dark J-V curve shows the increment of electrical conductivity for the RbCl-modified SnO2ETL. X-ray photoelectron spectroscopy (XPS) results demonstrate the surface defects passivation of the perovskite layer by modifying the SnO2ETL. A champion PCE of 19.35% has been achieved for the RbCl-modified SnO2ETL-based devices with improved stability, while the control devices with unmodified SnO2ETL show a PCE of 17.18%.