Journal
ADVANCED MATERIALS
Volume 31, Issue 44, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201904405
Keywords
CsPbBr3 thick films; high sensitivity; hot-pressing method; X-ray detectors
Categories
Funding
- Major State Basic Research Development Program of China [2016YFB0700702]
- National Natural Science Foundation of China [51761145048, 61725401, 51702107, 11674237, 51602211]
- WNLO
- China Postdoctoral Science Foundation [2018M642825]
- Natural Science Foundation of Jiangsu Province of China [BK20160299]
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An X-ray detector with high sensitivity would be able to increase the generated signal and reduce the dose rate; thus, this type of detector is beneficial for applications such as medical imaging and product inspection. The inorganic lead halide perovskite CsPbBr3 possesses relatively larger density and a higher atomic number in contrast to its hybrid counterpart. Therefore, it is expected to provide high detection sensitivity for X-rays; however, it has rarely been studied as a direct X-ray detector. Here, a hot-pressing method is employed to fabricate thick quasi-monocrystalline CsPbBr3 films, and a record sensitivity of 55 684 mu C Gy(air)(-1) cm(-2) is achieved, surpassing all other X-ray detectors (direct and indirect). The hot-pressing method is simple and produces thick quasi-monocrystalline CsPbBr3 films with uniform orientations. The high crystalline quality of the CsPbBr3 films and the formation of self-formed shallow bromide vacancy defects during the high-temperature process result in a large mu tau product and, therefore, a high photoconductivity gain factor and high detection sensitivity. The detectors also exhibit relatively fast response speed, negligible baseline drift, and good stability, making a CsPbBr3 X-ray detector extremely competitive for high-contrast X-ray detections.
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