Journal
RSC ADVANCES
Volume 7, Issue 34, Pages 20845-20850Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra01073g
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Funding
- Natural Science Foundation of China [NSFC51372143, 51102151, 50990061]
- Natural Science Foundation of Shandong Province [ZR2011EMQ002, 2013GGX10208]
- Independent Innovation Foundation of Shandong University [2012GN051]
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In perovskite-TiO2 composite optoelectronic devices, a large grain size, a high percentage of {001} facets, TiO2 nanocrystals with high crystallinity, and good interconnectivity between both TiO2 and perovskite particles are crucial for the excellent performance of a hybrid photodetector. In this work, a high pressure hydrothermal method was developed to synthesize highly crystalline ultrathin (2-3 nm) TiO2 nanosheets bound with a high percentage of {001} facets. When these TiO2 nanosheets were utilized in the fabrication of perovskite-TiO2 composite photodetectors, a strikingly increased responsivity and detectivity were achieved. Furthermore, when the films were subjected to high pressure thermal treatment, both the particle size and the uniformity of the composite films greatly increased, resulting in a better performance of the hybrid photodetectors.
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