Zhang Taiyang, Wang Yong, Wang Xingtao, Wu Min, Liu Wenhua, Zhao Yixin
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
Sci Bull (Beijing). 2019 Dec 15;64(23):1773-1779. doi: 10.1016/j.scib.2019.09.022. Epub 2019 Sep 23.
All-inorganic CsPbX (X = I, Br) perovskites without organic component are promising for long-term stability but face main challenges of facile fabrication and phase stability. Here we discover a general organic methylamine acetate salt mediated growth method to deposit high quality phase pure and stable CsPbX (X = I, Br) perovskite films via a novel precursor consisting of stoichiometric cesium acetate (CsAc), methylamine halide (MAX) and lead halide (PbX). Interestingly, these organic salts of CsAc and MAX could efficiently promote the crystallization process especially lower the crystallization temperature, but do not introduce the incorporation of organic MA cation into all-inorganic CsPbX perovskites. These phase pure and stable CsPbX perovskites with tunable band gaps can be fabricated into high efficiency photovoltaics. Our organic salt mediated growth of all-inorganic perovskite not only reveals the all-inorganic CsPbX perovskite's unique crystal growth mechanism but also demonstrates their promising application for photovoltaics.
不含有机成分的全无机CsPbX（X = I，Br）钙钛矿具有长期稳定性的潜力，但面临着易于制备和相稳定性方面的主要挑战。在此，我们发现了一种通用的有机乙酸甲胺盐介导生长方法，通过由化学计量的乙酸铯（CsAc）、甲胺卤化物（MAX）和卤化铅（PbX）组成的新型前驱体来沉积高质量的相纯且稳定的CsPbX（X = I，Br）钙钛矿薄膜。有趣的是，这些CsAc和MAX的有机盐可以有效地促进结晶过程，特别是降低结晶温度，但不会将有机MA阳离子掺入全无机CsPbX钙钛矿中。这些具有可调带隙的相纯且稳定的CsPbX钙钛矿可被制成高效光伏器件。我们的有机盐介导的全无机钙钛矿生长不仅揭示了全无机CsPbX钙钛矿独特的晶体生长机制，还展示了它们在光伏领域的广阔应用前景。
