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.