Although perovskite solar cells have been widely investigated to improve the photovoltaic conversion efficiency so far, perovskite light absorbers have a severe disadvantage for commercialization due to their facile degradation when exposed to humidity and oxygen. Herein, we suggest a synergic anti-solvent dripping strategy to improve the performance and stability of a photovoltaic device using a mixture of PMMA/sodium borate salt (borax) and perovskite materials. We characterized its unique features, i.e., the enhanced hydrogen bond formation between the PMMA/sodium borate mixture and the perovskite light absorber, which induced the lateral grain growth of perovskite films and efficient passivation of the surface and grain boundaries. Consequently, the PMMA/borax-treated devices exhibited significantly improved efficiency from 20.93% to 22.05% and retained 80% of the initial device performance over 1084 h at 22 °C and 50% RH. We believe that this technology will be useful for commercializing various optoelectronic devices.

中文翻译：

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交联钙钛矿/聚合物与硼酸钠的复合材料用于高效稳定的钙钛矿太阳能电池

尽管迄今为止钙钛矿太阳能电池已被广泛研究以提高光伏转换效率，但钙钛矿光吸收剂在暴露于湿度和氧气时容易降解，因此在商业化方面存在严重缺点。在此，我们提出了一种协同反溶剂滴注策略，以提高使用 PMMA/硼酸钠盐（硼砂）和钙钛矿材料的混合物的光伏器件的性能和稳定性。我们描述了它的独特之处，即，PMMA/硼酸钠混合物与钙钛矿光吸收剂之间的氢键形成增强，这导致钙钛矿薄膜的横向晶粒生长和表面和晶界的有效钝化。因此，经过 PMMA/硼砂处理的器件的效率从 20.93% 显着提高到 22.05%，并且在 22 °C 和 50% RH 下 1084 小时内保持了初始器件性能的 80%。我们相信这项技术将有助于将各种光电设备商业化。