High-Heat and Photo-Stable Perovskite Solar Cells through Ion Capture Layer

Abstract

conversion efficiency (PCE) in recent decades and commercialization is just around the corner. Nowadays, they have achieved over 25.5% of PCEs with their excellent properties, such as long diffusion length, high absorption coefficient, and balanced ambipolar carrier transports. In order to commercialize photovoltaic (PV), a product lifetime of at least 20 years is essential, as a conventional crystalline silicon PV module. However, perovskite suffers from low thermal stability and light stability. In this study, we dramatically increased the thermal and light stability of PSCs by introducing a layer capable of inhibiting migration of ions called ion capture layer. Unlike the former materials that block ion migration, a material with tetramethylammonium (TMA+) and SO3-, which are ion groups that could be directly bonded to iodide and silver ions, was used as the ion capture layer. As a result, PSCs achieved a PCE of 23.3% and maintained >95% of their initial value after >1560 hours at 85 oC heat and retained >80% of their initial PCEs after 700 hours at 1 sun condition.