Antisolvent-assisted Crystallization of Centimeter-sized Lead-free Bismuth Bromide Hybrid Perovskite Single Crystals with X-ray Sensitive Merits,Chemistry - An Asian Journal

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Antisolvent-assisted Crystallization of Centimeter-sized Lead-free Bismuth Bromide Hybrid Perovskite Single Crystals with X-ray Sensitive Merits
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2021-10-28 , DOI: 10.1002/asia.202101041
Yaxin Xu ₁ , Jiarui Hu ₁ , Xinyuan Du ₂ , Xinglin Xiao ₁ , Mingkai Li ₁ , Jiang Tang ₂ , Junnian Chen ₁ , Yunbin He ₁

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Hybrid bismuth halides perovskites have emerged as promising candidates for X-ray detection, due to the strong absorptivity of high-energy X-ray photons, high resistivity, large carrier diffusion length and low toxicity. However, the mostly investigated hybrid bismuth iodides single crystals are usually opaque and require a harsh synthesis process. Herein, novel one-dimensional (1D) pentamethylenediamine bismuth bromide (PDA)BiBr₅ single crystals were synthesized via an antisolvent-assisted crystallization method at room temperature. Bulk (PDA)BiBr₅ single crystals have sizes of 10×1.3×1.5 mm³ and high transparency. They are shown to have low density of defects of 2.0×10¹⁰ cm⁻³ and obvious photoconductivity. Moreover, they exhibit large bulk resistivity of 2.13×10¹¹ Ω cm and good X-ray attenuation coefficient. Consequently, the vertical structured (PDA)BiBr₅ single crystal X-ray photoconductor produces a sensitivity of 3.8 μC Gy_air⁻¹ cm⁻². This study provides a facile strategy for synthesizing bulk hybrid bismuth bromides single crystals with potential X-ray detection application.

中文翻译：

具有 X 射线敏感性优点的厘米级无铅溴化铋杂化钙钛矿单晶的反溶剂辅助结晶

由于高能 X 射线光子的强吸收性、高电阻率、大载流子扩散长度和低毒性，杂化卤化铋钙钛矿已成为 X 射线检测的有希望的候选者。然而，研究最多的混合碘化铋单晶通常是不透明的，需要苛刻的合成过程。在此，通过反溶剂辅助结晶法在室温下合成了新型一维 (1D) 戊二胺溴化铋 (PDA)BiBr ₅单晶。块状(PDA)BiBr ₅单晶具有10×1.3×1.5 mm ^{3 的}尺寸和高透明度。它们被证明具有 2.0×10 ¹⁰ cm ^{-3 的}低缺陷密度和明显的光电导。此外，它们表现出2.13×10 ¹¹ Ω cm的大体电阻率和良好的X射线衰减系数。因此，垂直结构的(PDA)BiBr ₅单晶X射线光电导体产生3.8μC Gy _air^-1 cm ^-2的灵敏度。该研究为合成具有潜在 X 射线检测应用的大块杂化溴化铋单晶提供了一种简便的策略。

更新日期：2021-12-13

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