Abstract Cs2AgBiBr6 is a very promising lead-free double perovskite semiconductor material for low limit x-ray detection. However, the limited size of only 3–4 mm single crystals have been reported using inverse temperature crystallization method recently. To grow larger single crystals of Cs2AgBiBr6, only one, two or three single crystals should be grown during the spontaneous crystallization process. We have found that additive CH3COONa can solve this problem of the numbers of as-grown crystals. Single crystal Cs2AgBiBr6 with the maximum size of 13 mm has been successfully grown by cooling the solution with additive 30% CH3COONa. The Powder X-ray diffraction pattern of (1 1 1) plane revealed that the as-grown crystal had a good single crystallinity. Based on the single crystal, the optical transmission spectra, optical transmission microscopy image, temperature dependent photon-emission spectra and current–voltage properties have also been investigated. Therefore, CH3COONa is a suitable additive agent to grow larger Cs2AgBiBr6 single crystal with centimeter size.

中文翻译：

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CH3COONa添加剂生长厘米级无铅全无机钙钛矿Cs2AgBiBr6晶体及其性能

摘要 Cs2AgBiBr6 是一种非常有前途的无铅双钙钛矿半导体材料，用于低限 X 射线检测。然而，最近使用逆温结晶方法报道了仅 3-4 mm 单晶的有限尺寸。为了生长更大的 Cs2AgBiBr6 单晶，在自发结晶过程中应该只生长一个、两个或三个单晶。我们发现添加 CH3COONa 可以解决生长晶体数量的问题。通过用 30% CH3COONa 添加剂冷却溶液，成功生长了最大尺寸为 13 mm 的单晶 Cs2AgBiBr6。(1 1 1)面的粉末X射线衍射图表明，生长的晶体具有良好的单结晶度。基于单晶，光透射光谱，还研究了光学透射显微镜图像、温度相关的光子发射光谱和电流-电压特性。因此，CH3COONa 是一种合适的添加剂，可以生长更大的厘米级 Cs2AgBiBr6 单晶。