Search

This work reports the impact of electron transport layers (ETLs) on the performance of perovskite solar cells (PSCs). The ETLs are based on tin (IV) oxide (SnO 2 ) prepared in different nanostructures. The carrier transport properties of PSCs are systematically characterized and the underlying mechanism for the enhancement in performance of PSCs is found. The strategies for optimizing the interface between the ETL and perovskite are demonstrated, yielding a champion device with a power conversion efficiency (PCE) of 20.8 %.

The performance of perovskite solar cells (PSCs) are determined by a number of factors including the quality of perovskite absorber, types of the carrier transports layers and the interfacial quality between the perovskite thin film and carrier transport layers. This work demonstrates effective fabrication strategies focusing on the mixed perovskites and electron transport layers (ETLs). A novel cryogenic-assisted technique is used to grow high-quality mixed perovskite thin films. The performance of PSCs based on SnO 2 ETL is found to be more promising compared to the commonly used TiO 2 , in terms of power conversion efficiency (PCE) and light stability. To achieve hysteresis-free PSCs, the architecture of the electron transport layers should be also carefully optimized.