Improving the Performance and Reproducibility of Inverted Planar Perovskite Solar Cells Using Tetraethyl Orthosilicate as the Antisolvent
Improving the Performance and Reproducibility of Inverted Planar Perovskite Solar Cells Using Tetraethyl Orthosilicate as the Antisolvent
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使用原硅酸四乙酯作为反溶剂提高倒置平面钙钛矿太阳能电池的性能和再现性
DOI：
10.1021/acsami.8b18402
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发表时间：
2019
影响因子：
9.5
通讯作者：
Luo Wei
中科院分区：
文献类型：
--
作者：
Wang Mei;Fu Qiuyun;Yan Liang;Guo Pengju;Zhou Ling;Wang Geng;Zheng Zhiping;Luo Wei
反溶剂辅助结晶已广泛用于钙钛矿太阳能电池（PSC），尽管这种方法有一个致命的缺点，即重复性低，源于当前反溶剂的极其恶劣的操作条件。因此，只有熟练的技术人员才有资格制备钙钛矿薄膜来制造高效器件，这降低了PSC的进展速度。此外，最常用的抗溶剂甲苯（TL）和氯苯（CB）具有剧毒和致癌性。鉴于这些，我们试图开发一种低危险的反溶剂，使我们能够实现高效和高度可重复的 PSC。在此，原硅酸四乙酯（TEOS）被用于反向NiOX基平面PSC中，用于设计高效的钙钛矿层，在玻璃基板上实现了17.02％的功率转换效率，在柔性聚合物基板上实现了14.49％的功率转换效率，并且滞后可以忽略不计，甚至优于TL和CB。更重要的是，TEOS PSC 表现出比同类产品更高的重现性。这些理想的特性应归功于更高质量的钙钛矿薄膜，具有更大的晶粒尺寸、降低的缺陷密度，从而实现更平滑的载流子传输和更慢的载流子复合。这项工作推动PSC的工业规模商业化又迈出了一步，也为环保光伏应用铺平了道路。
Antisolvent-assisted crystallization has been extensively used for perovskite solar cells (PSCs), although this approach has a fatal drawback, low reproducibility, originating from the extremely harsh operating conditions of the current antisolvents. As a result, only skilled technicians are qualified to be scheduled to prepare perovskite thin films to fabricate high-efficiency devices, which lowers the pace of progress of PSCs. Besides, the most popular antisolvents toluene (TL) and chlorobenzene (CB) are highly toxic and carcinogenic. On account of these, we tried to develop a low hazardous antisolvent that enabled us to achieve highly efficient and highly reproducible PSCs. Herein, tetraethyl orthosilicate (TEOS) was employed in the inverted NiOX-based planar PSC for engineering an efficient perovskite layer, achieving a power conversion efficiency of 17.02% on glass substrates and 14.49% on flexible polymer substrates with negligible hysteresis, which even outperformed TL and CB. More importantly, TEOS PSCs exhibited much higher reproducibility than that of their counterparts. These desirable features should be ascribed to the higher-quality perovskite films with larger grain size, reduced density of defects, and thus smoother carrier transportation and slower carrier recombination. This work drives another step toward industrial-scale commercialization of PSCs and also paves the way for environmentally friendly photovoltaic applications.