COMPOSITION AND INTERFACE ENGINEERING TOWARDS EFFICIENT LEAD-LEAN PEROVSKITE SOLAR CELLS

Abstract

Recently, perovskite solar cells (PSCs) have been the most promising photovoltaic solar cell which could efficiently convert renewable sunlight into electricity. Although the record power conversion efficiency of PSCs has achieved 25.7%, the stability and lead toxicity issues also restrict the development of PSCs. In order to decrease the environmental pollution, tin-lead (Sn-Pb) mixed PSCs have been introduced. The ideal bandgap of Sn-Pb mixed PSCs also makes it possible to realize higher efficiency. To prepare high-performance hole transport layer-free Sn-Pb mixed PSCs, hydroiodic acid (HI) and thiocyanate guanidinium (GASCN) were firstly introduced into perovskite solution to regulate perovskite crystallization process to obtain compact and uniform perovskite films. Then 4,4'-sulfonyldiphenol (DSP) was employed to passivate surface trap states on Sn-Pb mixed perovskite films to effectively enhance device performance. Furthermore, the simplified device structure also offers great application potential in all-perovskite tandem solar cells.