All-inorganic CsPbIBr₂ perovskite has attracted widespread attention in photovoltaic and other optoelectronic devices because of its superior thermal stability. However, the deposition of high-quality solution-processed CsPbIBr₂ perovskite films with large thicknesses remains challenging. Here, we develop a triple-component precursor (TCP) by employing lead bromide, lead iodide, and cesium bromide, to replace the most commonly used double-component precursor (DCP) consisting of lead bromide and cesium iodide. Remarkably, the TCP system significantly increases the solution concentration to 1.3 M, leading to a larger film thickness (∼390 nm) and enhanced light absorption. The resultant CsPbIBr₂ films were evaluated in planar n-i-p structured solar cells, which exhibit a considerably higher optimal photocurrent density of 11.50 mA cm⁻² in comparison to that of DCP-based devices (10.69 mA cm⁻²). By adopting an organic surface passivator, the maximum device efficiency using TCP is further boosted to a record efficiency of 12.8% for CsPbIBr₂ perovskite solar cells.

全无机CsPbIBr ₂钙钛矿因其优异的热稳定性而在光伏和其他光电器件中引起了广泛关注。然而，沉积高质量的大厚度CsPbIBr ₂钙钛矿薄膜仍然具有挑战性。在这里，我们使用溴化铅、碘化铅和溴化铯开发了一种三组分前驱体（TCP），以取代最常用的由溴化铅和碘化铯组成的双组分前驱体（DCP）。值得注意的是，TCP 系统将溶液浓度显着提高至 1.3 M，从而导致更大的膜厚度（~390 nm）和增强的光吸收。所得的CsPbIBr _{2薄膜在平面nip结构太阳能电池中进行了评估，与基于DCP的器件（10.69 mA cm} ^-2 ）相比，其表现出显着更高的最佳光电流密度11.50 mA cm ^-2。通过采用有机表面钝化剂，使用TCP的最大器件效率进一步提高至CsPbIBr ₂钙钛矿太阳能电池的创纪录效率12.8%。