Liu Xinmei, Li Haojin, Cui Qingyue, Wang Shumei, Ma Chuang, Li Nan, Bu Nuo, Yang Tinghuan, Song Xin, Liu Yucheng, Yang Zhou, Zhao Kui, Liu Shengzhong Frank
Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, Institute for Advanced Energy Materials, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China.
Dalian National Laboratory for Clean Energy, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China.
Angew Chem Int Ed Engl. 2022 Oct 10;61(41):e202209320. doi: 10.1002/anie.202209320. Epub 2022 Sep 2.
X-ray detectors have broad applications in medicine and industry. Although flexible lead-free perovskite films are competitive because of their lightweight and low toxicity, they are less efficient due to low charge transport. Herein, we report low-toxicity, flexible X-ray detectors based on p-type doped MA Bi I (MA=methylammonium) perovskite-filled membranes (PFMs). Strong coordination between dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) and MA Bi I and the establishment of charge-transfer complex (CPX) improved the conductivity by four times. The flexible X-ray detector achieved a high sensitivity of 2065 μC Gy cm and an ultra-low detection limit of 2.71 nGy s , which is among the highest values in all environmentally friendly flexible X-ray detectors. Importantly, the PFMs retained excellent charge transport under mechanical stress. All of those make flexible MA Bi I membranes more competitive as next-generation X-ray detection.
X射线探测器在医学和工业领域有着广泛的应用。尽管柔性无铅钙钛矿薄膜因其重量轻和毒性低而具有竞争力，但由于其电荷传输率低，效率也较低。在此，我们报道了基于p型掺杂MA Bi I（MA = 甲铵）钙钛矿填充膜（PFMs）的低毒性柔性X射线探测器。掺杂剂2,3,5,6-四氟-7,7,8,8-四氰基对苯二醌二甲烷（F4-TCNQ）与MA Bi I之间的强配位作用以及电荷转移复合物（CPX）的形成使电导率提高了四倍。该柔性X射线探测器实现了2065 μC Gy cm的高灵敏度和2.71 nGy s 的超低检测限，这在所有环保型柔性X射线探测器中处于最高值之列。重要的是，PFMs在机械应力下仍保持出色的电荷传输性能。所有这些使得柔性MA Bi I膜作为下一代X射线探测器更具竞争力。
