SnO₂-based perovskite solar cells (PSCs) have made tremendous progress, but there's still a lot of room for optimization of the fill factor (FF) and power conversion efficiency (PCE) compared with the short-circuit current density and open-circuit voltage. The FF is strongly related to carrier extraction and transport efficiency. In this study, a simple method for passivating SnO₂ by integrating carboxymethyldextran sodium (CMD) into a SnO₂ colloidal mixture is presented. It is shown that the addition of CMD can improve the electronic properties of SnO₂, reduce the nonradiative recombination, effectively passivate the defects at the buried interface of SnO₂ and perovskite, and make the device form a suitable energy level arrangement. As a result, the efficiency of this SnO₂-CMD-based device is increased from 23.09% to 24.73%, and the FF is significantly increased to 84.89%, with negligible hysteresis. At a relative humidity of 20–30% and a temperature of 25 °C, the device retains 86% of its original PCE after 1000 hours of storage. This study provides a low-cost, convenient and efficient method for realizing efficient and stable PSCs.

中文翻译：

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羧甲基葡聚糖钠改性 SnO2 可实现高效、稳定的钙钛矿太阳能电池，填充因子高达 84.89%


基于 SnO₂ 的钙钛矿太阳能电池 （PSC） 已经取得了巨大进步，但与短路电流密度和开路电压相比，填充因子 （FF） 和功率转换效率 （PCE） 的优化空间仍有很大的空间。FF 与载流子提取和运输效率密切相关。在本研究中，提出了一种通过将羧甲基葡聚糖钠 （CMD） 掺入 SnO₂ 胶体混合物中来钝化 SnO₂ 的简单方法。结果表明，CMD 的加入可以改善 SnO₂ 的电子性能，减少非辐射复合，有效钝化 SnO₂ 和钙钛矿埋藏界面处的缺陷，使器件形成合适的能级排列。因此，这种基于 SnO 2-CMD 的器件的效率从 23.09% 提高到 24.73%，FF 显着提高到 84.89%，滞后可以忽略不计。在 20–30% 的相对湿度和 25 °C 的温度下，该设备在存放 1000 小时后仍可保留其 86% 的原始 PCE。本研究为实现高效稳定的 PSC 提供了一种低成本、便捷高效的方法。