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A Lead-Free Hybrid Iodide with Quantitative Response to X-ray Radiation
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-07-17 00:00:00 , DOI: 10.1021/acs.chemmater.9b02263 Kewen Tao 1, 2 , Yaobin Li 1, 2 , Chengmin Ji 1 , Xitao Liu 1 , Zhenyue Wu 1 , Shiguo Han 1 , Zhihua Sun 1 , Junhua Luo 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-07-17 00:00:00 , DOI: 10.1021/acs.chemmater.9b02263 Kewen Tao 1, 2 , Yaobin Li 1, 2 , Chengmin Ji 1 , Xitao Liu 1 , Zhenyue Wu 1 , Shiguo Han 1 , Zhihua Sun 1 , Junhua Luo 1
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Single crystals of lead halide hybrid perovskites (e. g., CH3NH3PbI3 and CsPbBr3) have been developed as promising candidates for X-ray detection, owing to their excellent attributes including low trap density, high X-ray absorption cross section, and high carrier mobility. The toxicity of lead, however, is a potential bottleneck that hinders their device application toward green and sustainable competitors. Herein, we reported a new lead-free bismuth-iodide hybrid of (H2MDAP)BiI5 (1, H2MDAP = N-methyl-1,3-diaminopropanium), adopting one-dimensional (1D) metal-halogen frameworks, which behaves as a potential alternative for X-ray detection. Large-size single crystals of 1 with sizes up to 9 × 7 × 4 mm3 were successfully grown via top-seeded solution growth method. The as-grown crystal exhibits notable semiconducting properties, including a narrow bandgap of 1.83 eV, trap density of 3.6 × 1011 cm–3, carrier mobility of 1.42 cm2 V–1 s–1, and high X-ray absorption coefficient. Consequently, the fabricated crystal-based X-ray photoconductor enables the conversion of X-ray to electrical signals with a sensitivity of ∼1.0 μC Gyair–1 cm–2. These results throw light on further exploration on X-ray-sensitive materials based on the lead-free metal halogen hybrids.
中文翻译：
对X射线辐射有定量响应的无铅混合碘化物
铅卤化物混合钙钛矿的单晶（例如，CH 3 NH 3碘化铅3和CsPbBr 3）已经发展为有前途的X射线检测候选，由于其优异的特性，包括低陷阱密度，高X射线吸收截面，以及高运营商流动性。但是，铅的毒性是潜在的瓶颈，阻碍了其设备向绿色和可持续竞争者的应用。在这里，我们报道了一种新的（H 2 MDAP）BiI 5（1，H 2 MDAP = N-甲基-1,3-二氨基丙烷），采用一维（1D）金属-卤素骨架，可作为X射线检测的潜在替代品。通过顶部种子溶液生长法成功地生长了尺寸最大为9×7×4 mm 3的1的大尺寸单晶。刚生长的晶体具有显着的半导体性能，包括1.83 eV的窄带隙，3.6×10 11 cm –3的陷阱密度，1.42 cm 2 V –1 s –1的载流子迁移率以及高X射线吸收系数。因此，所制造的基于晶体的X射线光电导体能够将X射线转换为电信号，灵敏度约为1.0μCGy空气。–1厘米–2。这些结果为进一步探索基于无铅金属卤化物的X射线敏感材料提供了可能。
更新日期：2019-07-17
中文翻译：
对X射线辐射有定量响应的无铅混合碘化物
铅卤化物混合钙钛矿的单晶（例如，CH 3 NH 3碘化铅3和CsPbBr 3）已经发展为有前途的X射线检测候选，由于其优异的特性，包括低陷阱密度，高X射线吸收截面，以及高运营商流动性。但是，铅的毒性是潜在的瓶颈，阻碍了其设备向绿色和可持续竞争者的应用。在这里，我们报道了一种新的（H 2 MDAP）BiI 5（1，H 2 MDAP = N-甲基-1,3-二氨基丙烷），采用一维（1D）金属-卤素骨架，可作为X射线检测的潜在替代品。通过顶部种子溶液生长法成功地生长了尺寸最大为9×7×4 mm 3的1的大尺寸单晶。刚生长的晶体具有显着的半导体性能，包括1.83 eV的窄带隙，3.6×10 11 cm –3的陷阱密度，1.42 cm 2 V –1 s –1的载流子迁移率以及高X射线吸收系数。因此，所制造的基于晶体的X射线光电导体能够将X射线转换为电信号，灵敏度约为1.0μCGy空气。–1厘米–2。这些结果为进一步探索基于无铅金属卤化物的X射线敏感材料提供了可能。
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