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One-Step Construction of a Perovskite/TiO2 Heterojunction toward Highly Stable Inverted All-Layer-Inorganic CsPbI2Br Perovskite Solar Cells with 17.1% Efficiency
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-08-09 , DOI: 10.1002/aenm.202301607 Xingyu Pu 1 , Qi Cao 1 , Jie Su 2 , Jiabao Yang 1 , Tong Wang 1 , Yixin Zhang 1 , Hui Chen 1 , Xilai He 1 , Xingyuan Chen 1 , Xuanhua Li 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-08-09 , DOI: 10.1002/aenm.202301607 Xingyu Pu 1 , Qi Cao 1 , Jie Su 2 , Jiabao Yang 1 , Tong Wang 1 , Yixin Zhang 1 , Hui Chen 1 , Xilai He 1 , Xingyuan Chen 1 , Xuanhua Li 1
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All-layer-inorganic perovskite solar cells (PSCs) are prized for their remarkable thermal stability and low cost. However, “imperfect contact” at the perovskite heterojunction hinders charge transport and causes photochemical deterioration, restricting photovoltaic performance, and operational stability. Herein, an efficient perovskite/TiO2 heterojunction is constructed, produced by adding TiO2 to an antisolvent to concurrently form a CsPbI2Br perovskite layer and a top TiO2 electron transport layer in one step, which significantly improves the interfacial contact and thus facilitates charge transport at the heterojunction. The resultant inverted all-layer-inorganic PSCs exhibit a superior efficiency of 17.1%. Moreover, given the high-quality perovskite/TiO2 heterojunction and low interface defects, the encapsulated PSCs retain 91% or 92% of their initial efficiency for 1000 h under maximum power point tracking or damp-heat conditions (85 °C and 85% relative humidity), respectively. Surprisingly, the unencapsulated PSCs maintain an initial efficiency of 86% during aging, even at 200 °C for 200 h.
中文翻译：
一步构建钙钛矿/TiO2异质结，实现高度稳定的倒置全层无机CsPbI2Br钙钛矿太阳能电池，效率为17.1%
全层无机钙钛矿太阳能电池（PSC）因其卓越的热稳定性和低成本而备受赞誉。然而，钙钛矿异质结处的“不完美接触”会阻碍电荷传输并导致光化学劣化，限制光伏性能和运行稳定性。在此，通过将TiO 2添加到反溶剂中以同时形成CsPbI 2 Br钙钛矿层和顶部TiO 2来构建有效的钙钛矿/TiO 2 异质结。一步形成电子传输层，显着改善界面接触，从而促进异质结处的电荷传输。所得的倒置全层无机 PSC 表现出 17.1% 的优异效率。此外，鉴于高质量的钙钛矿/TiO 2异质结和低界面缺陷，封装的PSC在最大功率点跟踪或湿热条件下（85℃和85％）在1000小时内保持其初始效率的91％或92％相对湿度）。令人惊讶的是，未封装的 PSC 在老化过程中仍保持 86% 的初始效率，甚至在 200 °C 下老化 200 小时。
更新日期：2023-08-09
中文翻译：
一步构建钙钛矿/TiO2异质结，实现高度稳定的倒置全层无机CsPbI2Br钙钛矿太阳能电池，效率为17.1%
全层无机钙钛矿太阳能电池（PSC）因其卓越的热稳定性和低成本而备受赞誉。然而，钙钛矿异质结处的“不完美接触”会阻碍电荷传输并导致光化学劣化，限制光伏性能和运行稳定性。在此，通过将TiO 2添加到反溶剂中以同时形成CsPbI 2 Br钙钛矿层和顶部TiO 2来构建有效的钙钛矿/TiO 2 异质结。一步形成电子传输层，显着改善界面接触，从而促进异质结处的电荷传输。所得的倒置全层无机 PSC 表现出 17.1% 的优异效率。此外，鉴于高质量的钙钛矿/TiO 2异质结和低界面缺陷，封装的PSC在最大功率点跟踪或湿热条件下（85℃和85％）在1000小时内保持其初始效率的91％或92％相对湿度）。令人惊讶的是，未封装的 PSC 在老化过程中仍保持 86% 的初始效率，甚至在 200 °C 下老化 200 小时。
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