Li Bao-Yi, Xie Mei-Juan, Lu Jian, Wang Wen-Fei, Li Rong, Mi Jia-Rong, Wang Shuai-Hua, Zheng Fa-Kun, Guo Guo-Cong
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, P. R. China.
Small. 2023 Oct;19(42):e2302492. doi: 10.1002/smll.202302492. Epub 2023 May 8.
Anisotropic charge transport plays a pivotal role in clarifying the conductivity mechanism in direct X-ray detection to improve the detection sensitivity. However, the anisotropic photoelectric effect of semiconductive single crystal responsive to X-ray is still lacking of theoretical and experimental proof. The semiconductive coordination polymers (CPs) with designable structures, adjustable functions, and high crystallinity provide a suitable platform for exploring the anisotropic conductive mechanism. Here,the study first reveals a 1D conductive transmission path for direct X-ray detection from the perspective of structural chemistry. The semiconductive copper(II)-based CP 1 single crystal detector exhibits unique anisotropic X-ray detection performance. Along the 1D π-π stacking direction, the single crystal device (1-SC-a) shows a superior sensitivity of 2697.15 µCGy cm and a low detection limit of 1.02 µGy s among CPs-based X-ray detectors. This study provides beneficial guidance and deep insight for designing high-performance CP-based X-ray detectors.
各向异性电荷传输在阐明直接X射线检测中的导电机制以提高检测灵敏度方面起着关键作用。然而，半导体单晶对X射线响应的各向异性光电效应仍缺乏理论和实验证据。具有可设计结构、可调节功能和高结晶度的半导体配位聚合物（CPs）为探索各向异性导电机制提供了合适的平台。在此，该研究首次从结构化学的角度揭示了直接X射线检测的一维导电传输路径。基于半导体铜（II）的CP 1单晶探测器表现出独特的各向异性X射线检测性能。沿一维π-π堆积方向，单晶器件（1-SC-a）在基于CPs的X射线探测器中显示出2697.15 µCGy⁻¹ cm²的优异灵敏度和1.02 µGy s⁻¹的低检测限。该研究为设计高性能基于CPs的X射线探测器提供了有益的指导和深刻的见解。
