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.
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