The discovery and development of new Pb-free perovskite light-absorber materials that are eco-friendly and stable has become an active research area in the field of photovoltaics (PVs). These perovskites are being considered for possibly replacing the Pb-based organic-inorganic halide perovskites in state-of-the-art perovskite solar cells. While the recent effort in this area has led to certain progress, some scientific and technological issues still remain unresolved. Here we provide perspectives on the comprehensive understanding of perovskite toxicity/instability, followed by design strategies for new nontoxic, stable perovskites. We also envision unprecedented challenges in the processing of the promising candidate perovskites that bridges materials design and actual devices. Future research in these directions will open up new possibilities in realizing eco-friendly and stable perovskite PVs for real-world applications.

环保，稳定的新型无铅钙钛矿吸光材料的发现和开发已成为光伏（PVs）领域的活跃研究领域。这些钙钛矿被认为可能替代最先进的钙钛矿太阳能电池中的Pb基有机无机卤化物钙钛矿。尽管最近在这一领域的努力已取得了一定进展，但一些科学技术问题仍未解决。在这里，我们提供对钙钛矿毒性/不稳定性的全面理解的观点，然后介绍新的无毒，稳定的钙钛矿的设计策略。我们还预见了在处理将材料设计和实际设备联系起来的有前途的钙钛矿时将面临前所未有的挑战。