Lead-Free Perovskite and Perovskite-Inspired Materials for Indoor Photovoltaics: A Perspective

The past few years have witnessed increasing research interest in lead-free perovskites for indoor photovoltaics. Lead-free perovskites along with many reported perovskite halide analogue compounds take advantage of the solution-processibility, low-toxicity and high-theoretical efficiencies under weak indoor light conditions. Therefore, these semiconductors show promising potential as the next-generation indoor photovoltaics for integration with low-power wearables and internet-of-things electronics. In this perspective, we discuss the overview of the current research progress of lead-free perovskites for IPVs and highlight the challenges in this field as well as the speculative directions for further development.