Overcoming the toxicity of organic–inorganic perovskite materials is one of the main challenges in applying them to commercial optoelectronic devices, despite the amazing power conversion efficiency (PCE) of organic–inorganic hybrid perovskite solar cells (PSCs). In this work, we demonstrate a low-toxicity Pb-Cu alloyed perovskite film prepared by simple two-step methods and its integration in inverted PSCs. The formation of iodine defects was suppressed through the hydrogen bonding of guanidinium (Gua) cation (CH₆N₃⁺), which greatly improves the quality of the film. It is demonstrated that introduction of GuaI additives leads to stronger photoluminescence (PL) intensity, and lower defects state density. The open circuit voltage (Voc) and PCE of Pb-Cu alloyed PSCs reached 0.95 V and 9.69%, respectively. This work helps to guide the preparation of efficient low-toxicity Pb-Cu alloyed optoelectronic devices.

尽管有机-无机杂化钙钛矿太阳能电池（PSC）具有惊人的功率转换效率（PCE），但克服有机-无机钙钛矿材料的毒性是将其应用于商业光电器件的主要挑战之一。在这项工作中，我们展示了通过简单的两步法制备的低毒性 Pb-Cu 合金钙钛矿薄膜及其在倒置 PSC 中的集成。通过胍 (Gua) 阳离子 (CH ₆ N ₃ ⁺)，大大提高了影片的质量。结果表明，GuaI 添加剂的引入导致更强的光致发光 (PL) 强度和更低的缺陷态密度。Pb-Cu 合金 PSC 的开路电压 (Voc) 和 PCE 分别达到 0.95 V 和 9.69%。这项工作有助于指导制备高效的低毒性 Pb-Cu 合金光电器件。