Two-Dimensional Dion-Jacobson Perovskite (NH3C4H8NH3)CsPb2Br7 with High X-ray Sensitivity and Peak Discrimination of α-Particles.
Two-Dimensional Dion-Jacobson Perovskite (NH3C4H8NH3)CsPb2Br7 with High X-ray Sensitivity and Peak Discrimination of α-Particles.
复制标题
DOI：
10.1021/acs.jpclett.1c04204
复制
发表时间：
2022-01
期刊：
影响因子：
--
通讯作者：
B. Xiao;Qihao Sun;Shiyao Wang;Leilei Ji;Yingrui Li;Shouzhi Xi;Binbin Zhang;Junjie Wang;W. Jie;Yadong Xu
中科院分区：
文献类型：
--
作者：
B. Xiao;Qihao Sun;Shiyao Wang;Leilei Ji;Yingrui Li;Shouzhi Xi;Binbin Zhang;Junjie Wang;W. Jie;Yadong Xu
二维卤代钙钛矿材料由于其优异的光电性能、结构多样性和良好的稳定性而引起了人们的广泛兴趣。在此，我们生长了一种新型的二维Dion-Jacobson卤化物钙钛矿（BDA）CsPb 2Br 7（BDA = 1，4-丁二胺，NH3 C4 H8 NH32+），它具有大的带隙（~ 2.76 eV），高的电阻率（~ 4.35 × 1010 Ω·cm）和相当大的开关比（>700），表明在辐射探测方面具有巨大的潜力。实验和计算结果都表明，（BDA）CsPb 2Br 7比Ruddlesden-Popper钙钛矿（BA）2CsPb 2Br 7和（i-BA）2CsPb 2Br 7具有更高的迁移率，这归因于较短的层间距离增强了轨道相互作用.所得到的（BDA）CsPb 2Br 7探测器沿离面方向沿着达到725.5 μC·戈伊-1·cm-2的高X射线灵敏度。在负偏压为260 V的241 Am@5.48 MeV α粒子照射下，该探测器具有良好的峰值分辨能力，能量分辨率为± 37%.这些结果为二维Dion-Jacobson钙钛矿材料在未来辐射探测中的应用提供了广阔的前景.
Two-dimensional (2D) halide perovskites have attracted extensive interest because of their excellent optoelectronic properties, structural diversity, and promising stability. Herein, we grow a novel 2D Dion-Jacobson halide perovskite, (BDA)CsPb2Br7 (BDA = 1,4-butanediamine, NH3C4H8NH32+), which exhibits a large bandgap (∼2.76 eV), high resistivity (∼4.35 × 1010 Ω·cm), and considerable switching ratio (>700), indicating great potential for radiation detection. Both experimental and calculated results demonstrate that (BDA)CsPb2Br7 has a significantly improved mobility compared to those of Ruddlesden-Popper perovskites (BA)2CsPb2Br7 and (i-BA)2CsPb2Br7, which is attributed to the shorter interlayer distance leading to the enhanced orbital interactions. The resulting (BDA)CsPb2Br7 detector along the out-of-plane direction achieves a high X-ray sensitivity of 725.5 μC·Gy-1·cm-2. Another fascinating attribute is that the detector exhibits good peak discrimination with an energy resolution of ∼37% when illuminated by the 241Am@5.48 MeV α-particles under a negative bias of 260 V. These results provide a broad prospect for 2D Dion-Jacobson perovskites for future radiation detection applications.