Organometal halide perovskite solar cell enjoys a rapid development in the last decade. However, the severe J-V hysteresis existed in perovskite solar cells leads to an over- or under-estimation of device efficiency. Herein, we introduce an ammonium salt as a new dopant of perovskite. As a result, the J-V hysteresis is almost eliminated, and a higher average efficiency is obtained. Besides, the degradation under constant illumination in ambient atmosphere observed in control devices is greatly improved. Thin film characterizations reveal that the addition of ammonium salt leads to smoother, more homogenous and better crystalline perovskite films, which exhibit more intense photoluminescence and a little longer fluorescent lifetime. Such improvements are owing to the dual-functional sulfoxide (S

在过去的十年中，有机金属卤化物钙钛矿太阳能电池得到了快速的发展。但是，钙钛矿太阳能电池中存在严重的JV滞后现象，导致对器件效率的高估或低估。在此，我们介绍一种铵盐作为钙钛矿的新型掺杂剂。结果，几乎消除了JV磁滞，并且获得了更高的平均效率。此外，大大改善了在控制装置中观察到的在环境大气中恒定光照下的退化。薄膜表征表明，添加铵盐可导致更平滑，更均质和更好的结晶钙钛矿膜，该膜表现出更强的光致发光性和更长的荧光寿命。此类改进归功于双功能亚砜（S