In recent years, the power conversion efficiency of perovskite solar cells has increased to reach over 20%. Finding an effective means of defect passivation is thought to be a promising route for bringing further increases in the power conversion efficiency and the open-circuit voltage (V_OC) of perovskite solar cells. Here, we report the use of an organic halide salt phenethylammonium iodide (PEAI) on HC(NH₂)₂–CH₃NH₃ mixed perovskite films for surface defect passivation. We find that PEAI can form on the perovskite surface and results in higher-efficiency cells by reducing the defects and suppressing non-radiative recombination. As a result, planar perovskite solar cells with a certificated efficiency of 23.32% (quasi-steady state) are obtained. In addition, a V_OC as high as 1.18 V is achieved at the absorption threshold of 1.53 eV, which is 94.4% of the Shockley–Queisser limit V_OC (1.25 V).

近年来，钙钛矿太阳能电池的功率转换效率已经提高到超过20％。发现缺陷钝化的有效手段被认为是用于使在功率转换效率和开路电压（进一步增加一个有希望的途径V _OC钙钛矿的太阳能电池）。在这里，我们报告了在HC（NH ₂）₂ -CH ₃ NH ₃上使用有机卤化物盐碘乙基碘化铵（PEAI）用于表面缺陷钝化的混合钙钛矿薄膜。我们发现，PEAI可以在钙钛矿表面上形成，并通过减少缺陷和抑制非辐射重组而产生更高效率的细胞。结果，获得具有证明的效率为23.32％（准稳态）的平面钙钛矿太阳能电池。此外，在1.53 eV的吸收阈值下，可以获得高达1.18 V的V _OC，这是Shockley-Queisser极限V _OC（1.25 V）的94.4％。