期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 14, 期 9, 页码 1530-1534出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201900059
关键词
layered compounds; organic-inorganic hybrid composites; perovskites; photodetectors; two-dimensional materials
资金
- National Natural Science Foundation of China [21833010, 21525104, 21875251, 21622108, 21571178, 51802304, 21601188]
- NSF for Distinguished Young Scholars of Fujian Province [2016J06012]
- NSF of Fujian Province [2016J06012, 2018H0047, 2016J01082]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20010200]
- Youth Innovation Promotion of CAS [2015240, 2016274]
Inorganic-organic hybrid perovskites, especially two-dimensional (2D) layered halide perovskites, have attracted significant attention due to their unique structures and attractive optoelectronic properties, which open up a great opportunity for next-generation photosensitive devices. Herein, we report a new 2D bilayered inorganic-organic hybrid perovskite, (C6H13NH3)(2)(NH2CHNH2)Pb2I7 (HFA, where C6H13NH3+ is hexylaminium and NH2CHNH2+ is formamidinium), which exhibits a remarkable photoresponse under broadband light illumination. Structural characterizations demonstrate that the 2D perovskite structure of HFA is constructed by alternant stacking of inorganic lead iodide bilayered sheets and organic hexylaminium layers. Optical absorbance measurements combined with density functional theory (DFT) calculations suggest that HFA is a direct band gap semiconductor with a narrow band gap (E-g) of approximate to 2.02eV. Based on these findings, photodetectors based on HFA crystal wafer are fabricated, which exhibit fascinating optoelectronic properties including large on/off current ratios (over 10(3)), fast response speeds ((rise)=310s and (decay)=520s) and high responsivity (approximate to 0.95mAW(-1)). This work will contribute to the design and development of new two-dimensional bilayer inorganic-organic hybrid perovskites for high-performance photosensitive devices.
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