Halide perovskites are one of the most promising materials for delivery of the next generation of solar cells. Perovskite solar cells have enabled power conversion efficiency comparable with established technologies, such as silicon and cadmium telluride. Their stability is constantly improving and it is not difficult to believe that stability will soon reach the market requirements. There remains a main concern about the toxicity of lead, a constituent of all the better performing perovskite solar cells so far demonstrated. Here, we discuss the environmental and toxicological implications of lead, paying particular attention to the existing regulations. Both regulation and common sense suggest that perovskite solar cells have to become lead free to deliver a sustainable technology. Thus, we provide a critical overview of the current research and an outlook of the paths toward lead-free perovskite solar cells.

卤化物钙钛矿是交付下一代太阳能电池最有前途的材料之一。钙钛矿太阳能电池的功率转换效率可与诸如硅和碲化镉等成熟技术相媲美。它们的稳定性在不断提高，不难相信稳定性会很快达到市场要求。铅的毒性仍然是一个主要问题，铅是迄今为止表现出的所有性能更好的钙钛矿太阳能电池的组成部分。在这里，我们讨论铅对环境和毒理学的影响，并特别注意现有法规。法规和常识都表明，钙钛矿太阳能电池必须无铅才能提供可持续的技术。因此，