Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 44, Pages 15757-15761Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201909815
Keywords
hybrid double perovskites; lead-free perovskite; mobility-lifetime product; X-ray detection
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Funding
- National Natural Science Foundation of China [NSFC 21622108, 21875251, 21833010, 21525104]
- NSF of Fujian Province [2018H0047]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20010200]
- Youth Innovation Promotion of CAS
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Halide double perovskites have recently bloomed as the green candidates for optoelectronic applications, such as X-ray detection. Despite great efforts, the exploration of promising organic-inorganic hybrid double perovskites toward X-ray detection remains unsuccessful. Now, single crystals of the lead-free hybrid double perovskite, (BA)(2)CsAgBiBr7 (BA(+) is n-butylammonium), featuring the unique 2D multilayered quantum-confined motif, enable quite large mu tau (mobility-lifetime) product up to 1.21 x 10(-3) cm(2)V(-1). This figure-of-merit realized in 2D hybrid double perovskites is unprecedented and comparable with that of CH3NH3PbI3 wafers. (BA)(2)CsAgBiBr7 crystals also exhibit other intriguing attributes for X-ray detection, including high bulk resistivity, low density of defects and traps, and large X-ray attenuation coefficient. Consequently, a vertical-structure crystal device under X-ray source yields a superior sensitivity of 4.2 mu CGy(air)(-1)cm(-2).
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