Inorganic Perovskite Solar Cells: A Rapidly Growing Field

Since the first report in 2009, organic-inorganic hybrid perovskite solar cells (OIH-PSCs) which have achieved the power conversion efficiencies (PCEs) over 22% have gathered interest in the scientific community. Such high PCEs achieved by low-cost solution-processed fabrication techniques are comparable to the traditional commercial solar cells. However, before practical applications, the main challenge that must be addressed is material stability. Replacing organic–inorganic hybrid perovskite (OIH-PVK) with inorganic perovskites (I-PVKs) in PSCs has been a promising resolution and up to now, much progress has been made. In this review, a systematic review on the most recent research and progress in inorganic PSCs (I-PSCs) is presented, which is divided into three parts according to material category (lead-based I-PVK, lead-free I-PVK, and perovskite-derived materials). Moreover, current challenges and future research directions are suggested from the aspects of material stability, synthesis methods, device structure and working mechanism.