Low-temperature paintable carbon-based perovskite solar cells have been acknowledged as a promising photovoltaic device. However, the organometal trihalide perovskite film is always degraded by the solvents in the carbon paste, resulting in a fairly low efficiency. Unfortunately, in a conventional drying process, the movements of solvent molecules from a carbon paste to atmosphere are greatly obstructed by the biscale size of carbon black and graphite, which creates an extremely long evaporation path and drying time. To solve the problem, we have developed a simple, highly efficient and scalable method, a gas pump method (GPM), to dry the carbon paste very quickly which demonstrates a 7 times drying rate compared with conventional drying. As a result, the perovskite films covered by the carbon electrode (CE) dried by the GPM keep a uniform and continuous surface morphology, and the champion solar cell reveals a conversion efficiency of 12.30% with the area of 0.1 cm² and an open circuit voltage of 1.03 V, which are much higher than those (i.e., 4.73% and 0.81 V, respectively) observed for the PSC without GPM. Furthermore, the long-time stability test shows that the solar cells with the as-prepared CE retain more than 90% of its initial power conversion efficiency after 720 h.

中文翻译：

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快速干燥提高了低温可喷涂碳基钙钛矿太阳能电池的性能

低温可喷涂碳基钙钛矿太阳能电池已被公认为是有前途的光伏器件。然而，有机金属三卤化物钙钛矿膜总是被碳糊中的溶剂降解，导致相当低的效率。不幸的是，在常规的干燥过程中，碳黑和石墨的双刻度尺寸极大地阻碍了溶剂分子从碳浆向大气的运动，这导致了极长的蒸发路径和干燥时间。为了解决该问题，我们开发了一种简单，高效且可扩展的方法，即气泵法（GPM），可以非常快地干燥碳浆，与传统干燥相比，干燥速度提高了7倍。因此，²和1.03 V的开路电压，远远高于没有GPM的PSC的开路电压（分别为4.73％和0.81 V）。此外，长期稳定性测试表明，具有如此制备的CE的太阳能电池在720小时后仍保持其初始功率转换效率的90％以上。