标题：Managing Lead Leakage in Efficient Perovskite Solar Cells with Phosphate Interlayers
作者：Junjun Chen1,2, Sheng Li1,2, Tianshu Ma1,2, Donghui Wu1,2, Yue Zhao1,2, Changlei Wang1,2，*, Dewei Zhao3，*, Xiaofeng Li1,2，*
1 School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006 China
2 Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006 China
3 College of Materials Science and Engineering & Institute of New Energy and Low-Carbon Technology, Sichuan University, Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education, Chengdu, 610065 China
摘要：Lead leakage from perovskite solar cells (PSCs) leads to device failure and environment contamination. Here, these issues are solved with a sodium phosphate (Na3PO4)-modified tin(IV) dioxide (SnO2) layer that simultaneously boosts the device performance and captures most of dissolved lead in water. Phosphate incorporation improves charge transfers and passivates the buried perovskite interface, leading to highly improved device efficiency up to 23% with negligible hysteresis. More importantly, the phosphatized SnO2 layer shows high lead-adsorption capacity with a sequestration efficiency of 79.6% due to the numerous anchor sites of oxygen lone pairs, converting dissolved lead into insoluble compounds in water. This study presents a facile protocol of efficient and sustainable perovskite photovoltaics upon future commercialization.