Millimeter-scale semiconductive metal-organic framework single crystal for X-ray imaging
Liwei Cheng, Chengyu Liang, Baoyu Li, Haoming Qin, Pinhong Mi, Bin Chen, Yizhou Yan, Xing Dai, Chao Zhang, Yanlong Wang, Yanlong Wang, Yaxing Wang, Yaxing Wang, Shuao Wang
Abstract
One of the bottleneck issues in the design of semiconductive metal-organic frameworks is the growth of high-quality single crystals large enough for device fabrication. Here, we report the synthesis and crystal growth of a millimeter-scale semiconductive metal-organic framework (MOF; UO2(SC6H4COO)2(DMF), SCU-15) and further investigate its electrical properties. The single crystal of SCU-15 shows a charge-carrier mobility-lifetime product (μτ) of 2.18 × 10−3 cm2 V−1 and presents a carrier diffusion length exceeding 70 μm under X-ray excitation, which enables a significantly enhanced photocurrent response and detection sensitivity compared with those of the pelleted polycrystalline sample. As a proof of concept, a planar 2 × 3 pixelated detector is constructed to show its potential application in X-ray imaging. This work discloses an example of a millimeter pixel detector based on semiconductive MOF crystals, heralding the opportunity to develop a new generation of radiation-detection sensors.