%0 Journal Article %T Direct Conversion X-Ray Detectors with High Sensitivity at Low Dose Rate Based on All-Inorganic Lead-Free Perovskite Wafers %A Cuixian Zhang %J Detection %P 13-27 %@ 2331-2084 %D 2022 %I Scientific Research Publishing %R 10.4236/detection.2022.92002 %X Just as lead-based perovskites that are hot in solar cell preparation, Bi-based perovskites have demonstrated excellent performance in direct X-ray detection, especially the Cs₃Bi₂I₉ single crystals (SCs). However, compared with lead-halide perovskites, one challenge for the Cs₃Bi₂I₉ SCs for X-ray detection application is that it is difficult to prepare large-sized and high-quality SCs. Therefore, how to get a large area with a high-quality wafer is also as important as Cs₃Bi₂I₉ growth method research. Here, different anti-solvents are used for the preparation of poly-crystalline powder with the Antisolvents precipitation (A) method, as a control, High-energy ball milling (B) was also used to prepare poly-crystalline powders. The resultant two types of Cs₃Bi₂I₉ wafer exhibit a micro-strain of 1.21 ℅ 10^-3, a resistivity of 5.13 ℅ 10⁸ 次 cm and a microstrain of 1.21 ℅ 10^-3, a resistivity of 2.21 ℅ 10⁹ 次 cm. As a result, an X-ray detector based on the high-quality Cs₃Bi₂I₉ wafer exhibits excellent dose rate linearity, a sensitivity of 588 米C﹞Gyairs^-1﹞cm^-2 and a limit of detection (LoD) of 76 nGyair﹞s^-1. %K X-Ray Detection %K Sensitivity %K Cs< %K sub> %K 3< %K /sub> %K Bi< %K sub> %K 2< %K /sub> %K I< %K sub> %K 9< %K /sub> %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=117219