Low-Temperature Processable Charge Transporting Materials for the Flexible Perovskite Solar Cells

Abstract

Organic-inorganic hybrid lead halide perovskites have been extensively investigated for various optoelectronic applications. Particularly, owing to their ability to form highly crystalline and homogeneous films utilizing low-temperature solution processes (<150 degrees C), perovskites have become promising photoactive materials for realizing high-performance flexible solar cells. However, the current use of mesoporous TiO2 scaffolds, which require high-temperature sintering processes (>400 degrees C), has limited the fabrication of perovskite solar cells on flexible substrates. Therefore, the development of a low-temperature processable charge-transporting layer has emerged as an urgent task for achieving flexible perovskite solar cells. This review summarizes the recent progress in low-temperature processable electron- and hole-transporting layer materials, which contribute to improved device performance in flexible perovskite solar cells.