In the past decade, greatest effect has been paid on organic–inorganic halide perovskites for approaching high-performance perovskite solar cells (PSCs). It was found that severe surface-defect within the perovskite active layer restricted further boosting device performance of PSCs. Here, we report high-performance PSCs by utilization of an ultrathin solution-processed poly(ethylene glycol) diacrylate (PEGDA) layer to passivate the surface-defect within the perovskite thin film. Systematical studies demonstrate that the PEGDA-passivated perovskite thin film exhibit suppressed nonradiative recombination and trap density, as well as superior film morphology with a smoother surface, larger crystal size, and better crystallinity. Moreover, PSCs by the PEGDA-passivated perovskite thin film exhibit suppressed charge carrier recombination, reduced charge-transfer resistance, shorter charge carrier extraction time, and enlarged built-in potential. As a result, PSCs by the PEGDA-passivated perovskite thin film show a power conversion efficiency of over 21% and a photocurrent hysteresis index of 0.037. Moreover, unencapsulated PSCs by the PEGDA-passivated perovskite thin film possess over 10 day operational stability. All these results indicate that our approach provided a facile way to boost device performance of PSCs.

中文翻译：

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聚乙二醇二丙烯酸酯作为高性能钙钛矿太阳能电池的钝化层。

在过去的十年中，有机-无机卤化物钙钛矿接近高性能钙钛矿太阳能电池（PSC）的影响最大。发现钙钛矿活性层内的严重表面缺陷限制了PSC器件性能的进一步提高。在这里，我们通过利用超薄溶液处理的聚（乙二醇）二丙烯酸酯（PEGDA）层钝化钙钛矿薄膜内的表面缺陷来报告高性能PSC。系统研究表明，PEGDA钝化的钙钛矿薄膜表现出抑制的非辐射复合和陷阱密度，以及具有平滑表面，更大晶体尺寸和更好结晶度的优异薄膜形态。此外，PEGDA钝化钙钛矿薄膜产生的PSC表现出抑制的载流子复合，降低了电荷转移电阻，缩短了电荷载流子提取时间，并增加了内置电位。结果，由PEGDA钝化的钙钛矿薄膜制成的PSC显示出超过21％的功率转换效率和0.037的光电流滞后指数。此外，PEGDA钝化钙钛矿薄膜未封装的PSC具有超过10天的运行稳定性。所有这些结果表明，我们的方法提供了一种简便的方法来提高PSC的设备性能。