Toxicity of Perovskite Solar Cells

Over the past decade, there has been significant and rapid developments in organic-inorganic hybrid perovskite solar cells (PVSCs). Despite the fact that the power conversion efficiency (PCE) of PVSCs has increased from 3.8% to 25.8%, approaching that of commercial single crystalline Si solar cells, the market is still dominated by Si-based photovoltaic (PV) technology. This can be attributed to the challenges associated with upscaling PVSCs, improving device stability, and reducing the toxicity of PVSCs, which are hurdles in commercializing perovskite PV technologies. In particular, the toxicity due to lead leakage of PVSCs makes it difficult for them to enter the market. Hence, in this article, the structure and working principle of PVSCs are first summarized. Then, the toxicity of PVSCs is discussed, including the impacts of organic solvents and perovskite precursor materials on the health and environment. In this section, examples of advanced strategies for reducing the toxicity of PVSCs are also provided. Finally, challenges and a perspective for developing nontoxic PVSCs are given.