期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201906232
关键词
BiFeO3; enhanced photocurrent; ferroelectric materials; high temperature; self-powered
类别
资金
- National Key R&D Program of China [2016YFA0202701]
- National Natural Science Foundation of China [51472055]
- External Cooperation Program of BIC, Chinese Academy of Sciences [121411KYS820150028]
- 2015 Annual Beijing Talents Fund [2015000021223ZK32]
- Qingdao National Laboratory for Marine Science and Technology [2017ASKJ01]
- University of Chinese Academy of Sciences [Y8540XX2D2]
- thousands talents program for the pioneer researcher and his innovation team, China
BiFeO3 (BFO) is a potentially important Pb-free ferroelectric with a narrow bandgap and is expected to become a novel photodetector. The photocurrent in BFO3 strongly depends on the temperature but only a few studies have investigated in detail the relationships between photocurrent and temperature. Here, the temperature-dependent photocurrent and the corresponding photosensing properties of a Ag/BFO/indiumtin oxide (ITO) photodetector based on an optimized planar-structured electrode configuration are investigated. The photocurrent and responsivity of the BFO3-based photodetector can first be increased and then be decreased with increasing temperature. The largest photocurrent and responsivity can reach 51.5 mu A and 6.56 x 10(-4) A W-1 at 66.1 degrees C, which is enhanced 126.3% as compared with that at room temperature. This may be caused by the temperature-modulated bandgap and barrier height in Ag/BFO/ITO device. This study clarifies the relationship between photosensing performance and the operating temperature of BFO-based photodetector and will push forward the application of ferroelectric materials in photoelectric field.
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