期刊
ADVANCED ELECTRONIC MATERIALS
卷 5, 期 1, 页码 -出版社
WILEY
DOI: 10.1002/aelm.201800413
关键词
BaTiO3; charge density; photodetectors; pyroelectricity; self-powered devices
资金
- National Key R&D Program of China [2016YFA0202701]
- National Natural Science Foundation of China [61604012, 51472055, 61404034]
- 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]
- Thousands Talents Program for the Pioneer Researcher and His Innovation Team, China
From the ferroelectric material family, BaTiO3 (BTO) demonstrates quite excellent pyroelectric features due to its inherent intrinsic spontaneous polarization capability. The pyroelectric effect induced by ultraviolet (UV) illumination can be utilized to realize the self-powered detection of the UV light, where the photosensing characteristics can be determined by the change in charge density with time. Here, a method to increase the charge density by removing the underneath substrate and reducing the device thickness is reported. A floating BTO-based device with thickness of approximate to 0.35 mm demonstrates an ultrahigh charge density of approximate to 1787.2 nC cm(-2) under 365 nm light illumination, which is almost 11.4 times higher than that of a 0.85 mm thick BTO device on Al2O3 substrate. These reported findings establish a new strategy for enhancing the charge density of the BTO-based devices with improved responses, which will be very helpful in upgrading the performances of future technological devices in optoelectronic devices and energy harvesters.
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