Nam Jeong-Seok, Kim Kyusun, Han Jiye, Kim Dawoon, Chung In, Wang Dong Hwan, Jeon Il
SKKU Advanced Institute of Nanotechnology (SAINT) and Department of Nano Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea.
Department of Chemistry Education, Graduate School of Chemical Materials, Crystal Bank Institute, Pusan National University, 63-2 Busandaehak-ro, Busan 46241, Republic of Korea.
ACS Appl Mater Interfaces. 2021 Sep 15;13(36):42935-42943. doi: 10.1021/acsami.1c13546. Epub 2021 Aug 31.
Lead-free perovskite solar cells (PSCs) have attracted interest among scientists searching for eco-friendly energy harvesting devices. Herein, the effects of ozone exposure on poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) in lead-free tin halide PSCs as a facile and low-cost process for improving device performance are analyzed. Two types of tin-based PSCs and one typical lead-based PSC were fabricated. The ozone exposure on PEDOT:PSS increases the short-circuit current density () and the fill factor (FF) of PSCs in all cases with perovskite grain enlargement and hole-mobility enhancement of the devices, respectively. For open-circuit voltage (), the outcome depends on the band gap and the energy levels of the perovskite films. While ozone exposure treatment is favorable for PEAFASnI-based tin PSCs, decreases with ozone exposure in the case of Ge:EDAFASnI-based tin PSCs because of a misalignment of the energy levels. Regardless, the efficiency of PEAFASnI-based tin PSCs increases from 8.7 to 10.1% when measured inside a glovebox upon ozone exposure of PEDOT:PSS. The efficiency of Ge:EDAFASnI-based tin PSCs increases from 6.8 to 8.1%, and the devices retain an efficiency of 5.0% even after 50 days in air.
无铅钙钛矿太阳能电池（PSCs）在寻求环保能量收集装置的科学家中引起了关注。在此，分析了臭氧暴露对无铅卤化锡PSCs中聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐（PEDOT:PSS）的影响，这是一种提高器件性能的简便且低成本的方法。制备了两种类型的锡基PSCs和一种典型的铅基PSCs。在所有情况下，对PEDOT:PSS进行臭氧暴露都会增加PSCs的短路电流密度（）和填充因子（FF），同时分别使器件的钙钛矿晶粒增大和空穴迁移率提高。对于开路电压（），结果取决于钙钛矿薄膜的带隙和能级。虽然臭氧暴露处理对基于PEAFASnI的锡基PSCs有利，但在基于Ge:EDAFASnI的锡基PSCs中，由于能级失配，开路电压会随着臭氧暴露而降低。无论如何，在手套箱内对PEDOT:PSS进行臭氧暴露测量时，基于PEAFASnI的锡基PSCs的效率从8.7%提高到了10.1%。基于Ge:EDAFASnI的锡基PSCs的效率从6.8%提高到了8.1%，并且这些器件即使在空气中放置50天后仍保持5.0%的效率。
