Department of Nuclear Science and Engineering , Nanjing University of Aeronautics and Astronautics , Nanjing 211106 , China.
Institute of Nuclear and New Energy Technology , Tsinghua University , Beijing 100084 , China.
ACS Appl Mater Interfaces. 2019 Mar 13;11(10):9679-9684. doi: 10.1021/acsami.8b21605. Epub 2019 Feb 26.
Hybrid methylammonium lead tribromide (MAPbBr) perovskite has attracted great attention in ionization radiation detection. However, the charge collection remains a challenge. Here, fast response and high-sensitivity X-ray detection based on MAPbBr single crystals with a surface barrier Schottky diode has been achieved at room temperature. The Schottky surface barrier can overcome the large leakage current at a high electrical field, enabling us to reduce the noise and increase the charge collection efficiency. This surface barrier device has been demonstrated a 3 times improvement over the photoconductor based X-ray detector, which enables usage in nuclear medicine, especially for X-ray imaging technology.
卤化甲基铵铅（MAPbBr）钙钛矿在电离辐射探测中引起了广泛关注。然而，电荷收集仍然是一个挑战。在此，基于表面势垒肖特基二极管的 MAPbBr 单晶体实现了室温下快速响应和高灵敏度的 X 射线探测。肖特基势垒可以克服高电场下的大漏电流，使我们能够降低噪声并提高电荷收集效率。与基于光电导的 X 射线探测器相比，这种表面势垒器件的性能提高了 3 倍，可用于核医学，特别是 X 射线成像技术。
