CsPbI₃ perovskite has drawn worldwide attention because of its thermal stability and outstanding photovoltaic performance. However, further improvement of CsPbI₃ device performance is hindered by significant energy losses via charge-carrier recombination at the CsPbI₃/transport layer interface and moisture sensitivity. Here, a beach-chair-shaped band structure is designed to introduce energy level gradients at both sides of the perovskite layer to steer optimal energy band alignment and heterojunction interface passivation in β-CsPbI₃ perovskite solar cells (PSCs), resulting in suppressed interfacial recombination, enhanced charge extraction, and more robust stability. As a result, champion solar cell efficiency is increased to as much as 17.12%, one of the highest in reported CsPbI₃ PSCs, and the V_oc of 1.15 V is among the highest reported values. Furthermore, bare PSCs without encapsulation retain 90.4% of their initial cell efficiency after being stored for 1 month under ambient conditions.

CsPbI ₃钙钛矿因其热稳定性和出色的光伏性能而受到全世界的关注。但是，由于在CsPbI ₃ /传输层界面处的载流子复合而产生的大量能量损失和湿气敏感性，阻碍了CsPbI ₃器件性能的进一步提高。在这里，一个海滩椅形带结构被设计成在所述钙钛矿层的两侧引入能级梯度以操纵在最佳的能量带排列和异质结界面钝化β-CsPbI ₃钙钛矿太阳能电池（PSC），可抑制界面复合，增强电荷提取，并提高稳定性。结果，冠军太阳能电池的效率提高到高达17.12％，是所报道的CsPbI ₃ PSC中最高的之一，而V _oc为1.15 V是报道的最高值之​​一。此外，未封装的裸露的PSC在环境条件下存储1个月后仍可保持其90.4％的初始电池效率。