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High-Performance CsPbIBr2 Perovskite Solar Cells: Effectively Promoted Crystal Growth by Antisolvent and Organic Ion Strategies
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-08-23 00:00:00 , DOI: 10.1021/acsami.9b09171 Boxue Zhang , Wenbo Bi , Yanjie Wu , Cong Chen , Hao Li , Zonglong Song , Qilin Dai 1 , Lin Xu , Hongwei Song
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-08-23 00:00:00 , DOI: 10.1021/acsami.9b09171 Boxue Zhang , Wenbo Bi , Yanjie Wu , Cong Chen , Hao Li , Zonglong Song , Qilin Dai 1 , Lin Xu , Hongwei Song
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Growing attention has been paid to CsPbIBr2 perovskite solar cells (PSCs) after balancing the band gap and stability features of the interested full-inorganic perovskites. However, their power-conversion efficiency (PCE) still lags behind that of the PSCs using hybrid halide perovskite and how to increase the corresponding PCE is still a challenge. Herein, antisolvents and organic ion surface passivation strategies were systematically applied to precisely control the growth of CsPbIBr2 crystals for constructing a high-quality full-inorganic perovskite film. Through careful adjustments, a CsPbIBr2 film with a pure phase, full coverage, and high crystallinity with preferable (100) orientation was successfully obtained by introducing diethyl ether as the antisolvent followed by guanidinium surface passivation. The optimal CsPbIBr2 film was composed by a large grain with an average size of 950 nm, few grain boundaries, and higher hydrophobic property. Planer PSC using the optimal CsPbIBr2 film and electron-beam-deposited TiO2 compact layer exhibits a PCE of 9.17%, which ranks among the highest PCE range of the reported CsPbIBr2 PSCs. Besides, the designed CsPbIBr2 PSC exhibited good long-term stability, which could maintain 90% of the initial PCE in 40% humidity ambient, which remained constant after heat treatment at 100 °C for 100 h. Based on the optimal CsPbIBr2 film, the flexible and large-area (up to 225 mm2) PSCs were further fabricated. The adopted film improvement methods were further extended to other kinds of full-organic PSCs, which demonstrated the universality of this strategy.
中文翻译：
高性能CsPbIBr 2钙钛矿太阳能电池：通过反溶剂和有机离子策略有效地促进了晶体的生长
在平衡感兴趣的全无机钙钛矿的带隙和稳定性特征之后，人们越来越关注CsPbIBr 2钙钛矿太阳能电池（PSC）。但是，它们的功率转换效率（PCE）仍然落后于使用混合卤化物钙钛矿的PSC的功率转换效率，如何提高相应的PCE仍然是一个挑战。本文中，系统地应用了抗溶剂和有机离子表面钝化策略来精确控制CsPbIBr 2晶体的生长，以构建高质量的全无机钙钛矿薄膜。通过仔细调整，CsPbIBr 2通过引入乙醚作为抗溶剂，然后进行胍表面钝化，成功获得了具有纯相，完全覆盖和高结晶度且具有优选（100）取向的薄膜。最佳的CsPbIBr 2薄膜由平均粒径为950 nm的大晶粒，很少的晶界和更高的疏水性组成。使用最佳CsPbIBr 2膜和电子束沉积的TiO 2致密层的平面PSC的PCE值为9.17％，在已报道的CsPbIBr 2 PSC的最高PCE范围内。此外，设计的CsPbIBr 2PSC表现出良好的长期稳定性，可以在40％的湿度环境中维持90％的初始PCE，在100°C热处理100 h后仍保持恒定。基于最佳的CsPbIBr 2薄膜，进一步制造了柔性大面积（最大225 mm 2）的PSC。所采用的电影改良方法进一步扩展到其他种类的全有机PSC，这证明了该策略的普遍性。
更新日期：2019-08-23
中文翻译：
高性能CsPbIBr 2钙钛矿太阳能电池：通过反溶剂和有机离子策略有效地促进了晶体的生长
在平衡感兴趣的全无机钙钛矿的带隙和稳定性特征之后，人们越来越关注CsPbIBr 2钙钛矿太阳能电池（PSC）。但是，它们的功率转换效率（PCE）仍然落后于使用混合卤化物钙钛矿的PSC的功率转换效率，如何提高相应的PCE仍然是一个挑战。本文中，系统地应用了抗溶剂和有机离子表面钝化策略来精确控制CsPbIBr 2晶体的生长，以构建高质量的全无机钙钛矿薄膜。通过仔细调整，CsPbIBr 2通过引入乙醚作为抗溶剂，然后进行胍表面钝化，成功获得了具有纯相，完全覆盖和高结晶度且具有优选（100）取向的薄膜。最佳的CsPbIBr 2薄膜由平均粒径为950 nm的大晶粒，很少的晶界和更高的疏水性组成。使用最佳CsPbIBr 2膜和电子束沉积的TiO 2致密层的平面PSC的PCE值为9.17％，在已报道的CsPbIBr 2 PSC的最高PCE范围内。此外，设计的CsPbIBr 2PSC表现出良好的长期稳定性，可以在40％的湿度环境中维持90％的初始PCE，在100°C热处理100 h后仍保持恒定。基于最佳的CsPbIBr 2薄膜，进一步制造了柔性大面积（最大225 mm 2）的PSC。所采用的电影改良方法进一步扩展到其他种类的全有机PSC，这证明了该策略的普遍性。
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