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Interfacial Sulfur Functionalization Anchoring SnO2 and CH3NH3PbI3 for Enhanced Stability and Trap Passivation in Perovskite Solar Cells
ChemSusChem ( IF 7.5 ) Pub Date : 2018-11-02 , DOI: 10.1002/cssc.201801888 Zhen Wang 1 , Muhammad Akmal Kamarudin 1 , Ng Chi Huey 1 , Fu Yang 1 , Manish Pandey 1 , Gaurav Kapil 1 , Tingli Ma 1 , Shuzi Hayase 1
ChemSusChem ( IF 7.5 ) Pub Date : 2018-11-02 , DOI: 10.1002/cssc.201801888 Zhen Wang 1 , Muhammad Akmal Kamarudin 1 , Ng Chi Huey 1 , Fu Yang 1 , Manish Pandey 1 , Gaurav Kapil 1 , Tingli Ma 1 , Shuzi Hayase 1
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Trap states at the interface or in bulk perovskite materials critically influence perovskite solar cells performance and long‐term stability. Here, a strategy for efficiently passivating charge traps and mitigating interfacial recombination by SnO2 surface sulfur functionalization is reported, which utilizes xanthate decomposition on the SnO2 surface at low temperature. The results show that functionalized sulfur atoms can coordinate with under‐coordinated Pb2+ ions near the interface. After device fabrication under more than 60 % humidity in ambient air, the efficiency of methylammonium lead iodide (MAPbI3) perovskite solar cells based on sulfur‐functionalized SnO2 increased from 16.56 % to 18.41 % with suppressed hysteresis, which resulted from the accelerated interfacial charge transport kinetics and decreased traps in bulk perovskite by interfacial sulfur functionalization. Additionally, thermally stimulated current studies show the decreased trap density in the shallow trap area after interfacial sulfur functionalization. The interfacial sulfur functionalized solar cells without sealing also exhibited considerable retardation of solar cell degradation with only 10 % degradation after 70 days air storage. This work demonstrates a facile sulfur functionalization strategy by using xanthate decomposition on SnO2 surfaces to obtain highly efficient perovskite solar cells.
中文翻译：
界面硫功能化固定SnO2和CH3NH3PbI3，以增强钙钛矿型太阳能电池的稳定性和陷阱钝化
界面处或钙钛矿材料中的陷阱状态会严重影响钙钛矿太阳能电池的性能和长期稳定性。在此，报道了通过SnO 2表面硫官能化有效钝化电荷陷阱并减轻界面复合的策略，该策略利用低温下SnO 2表面的黄药分解。结果表明，官能化硫原子可以与界面附近配位不足的Pb 2+离子配位。在环境空气湿度超过60％的条件下制造器件后，基于硫官能化SnO 2的甲基铵碘化铅（MAPbI 3）钙钛矿太阳能电池的效率滞后现象从滞后的16.56％增加到18.41％，这是由于界面硫官能化加速了界面电荷传输动力学和减少了钙钛矿块体内陷阱的缘故。此外，热激电流研究表明，在界面硫功能化之后，浅阱区的阱密度降低。没有密封的界面硫功能化太阳能电池还表现出相当大的太阳能电池降解延迟，在空气存储70天后仅降解10％。这项工作演示了通过在SnO 2表面上使用黄药分解来获得高效钙钛矿型太阳能电池的一种简便的硫官能化策略。
更新日期：2018-11-02
中文翻译：
界面硫功能化固定SnO2和CH3NH3PbI3，以增强钙钛矿型太阳能电池的稳定性和陷阱钝化
界面处或钙钛矿材料中的陷阱状态会严重影响钙钛矿太阳能电池的性能和长期稳定性。在此，报道了通过SnO 2表面硫官能化有效钝化电荷陷阱并减轻界面复合的策略，该策略利用低温下SnO 2表面的黄药分解。结果表明，官能化硫原子可以与界面附近配位不足的Pb 2+离子配位。在环境空气湿度超过60％的条件下制造器件后，基于硫官能化SnO 2的甲基铵碘化铅（MAPbI 3）钙钛矿太阳能电池的效率滞后现象从滞后的16.56％增加到18.41％，这是由于界面硫官能化加速了界面电荷传输动力学和减少了钙钛矿块体内陷阱的缘故。此外，热激电流研究表明，在界面硫功能化之后，浅阱区的阱密度降低。没有密封的界面硫功能化太阳能电池还表现出相当大的太阳能电池降解延迟，在空气存储70天后仅降解10％。这项工作演示了通过在SnO 2表面上使用黄药分解来获得高效钙钛矿型太阳能电池的一种简便的硫官能化策略。
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