Managing Lead Leakage in Efficient Perovskite Solar Cells with Phosphate Interlayers. Issue 18 (20th May 2022) - Chen, Junjun
Abstract: Lead leakage from perovskite solar cells (PSCs) leads to device failure and environment contamination. Here, these issues are solved with a sodium phosphate (Na3 PO4 )‐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. Abstract : Modification of tin dioxide with sodium phosphate improves carrier mobility and reduces energy level mismatching with perovskite, leading to efficient perovskite solar cells (PSCs) with the highest efficiency of 23.06%. In addition, sodium phosphate can adsorb the lead in the damaged PSCs with a sequestration efficiency reaching 79.6%.