Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 66, Issue 5, Pages 2224-2229Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2019.2903537
Keywords
Cs2AgBiBr6 X-ray detector; lead-free perovskite; noise characteristics; radiation detection electronics
Funding
- National Key Research and Development Program [2016YFA0200400]
- National Natural Science Foundation [61434001, 61574083, 61874065, 51861145202, 11604011]
- National Basic Research Program of China [2015CB352101]
- Beijing Innovation Center for Future Chip
- Beijing Natural Science Foundation [4184091]
- Shenzhen Science and Technology Program [JCYJ20150831192224146]
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In this paper, single crystals (SCs) of the Cs2AgBiBr6 double perovskite were grown using the method of crystallization from a supersaturated solution. It was shown that the natural crystal growth surface of the perovskite with perfect crystal quality is along the (111) plane by X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM) analyses. The fabricated high-sensitivity X-ray detector based on the Cs2AgBiBr6 SCs with vertical structure achieved detection sensitivity up to 316 mu CGyair(-1) cm(-2) under bias voltage of 18 V. Furthermore, the frequency noise characteristics of the device under different posttreatment processes were systematically analyzed, which indicated that the combination of thermal annealing and isopropanol rinsing can suppress field-driven ion migration and surface conduction channel, thereby increasing the resistivity of the perovskite material and reducing the noise current of the device. Our results revealed that the Cs2AgBiBr6 SCs-based X-ray detector with high sensitivity and low cost has a great potential for application in manufacturing lead-free and stable radiation detection electronics in the future.
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