Dual Interfacial Tin-Oxide Layer with Chloride Salt for High-Performance and Durable Perovskite Solar Cells
Sasiphapa Rodbuntum, Nuttaya Sukgorn, Narong Chanlek, Hideki Nakajima, Nopporn Rujisamphan, Pipat Ruankham, Duangmanee Wongratanaphisan, Anusit Kaewprajak, Pisist Kumnorkaew
Abstract
High Resolution Image Download MS PowerPoint Slide A tailored SnO 2 layer using double electron transport layers (ETLs) was designed to overcome interfacial energy barriers, enhance charge transport, and decrease charge recombination at the perovskite/ETL interfaces. Through this dual interfacial engineering approach, compact SnO 2 layers with an ideal interfacial energy-level alignment were prepared using SnCl 2 and NH 4 Cl salts, leading to efficient charge extraction. Stable perovskite solar cells with a power conversion efficiency of 21.46%, a high open-circuit voltage of 1.10 V, and a fill factor of 0.79 were successfully achieved using this approach. The devices also exhibited negligible hysteresis and no significant efficiency loss after a 2400 h stability test at ambient conditions without encapsulation. These results demonstrate an efficient approach to achieving high-quality ETL layers for efficient and stable solar cells.