Journal
NANO ENERGY
Volume 85, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.105968
Keywords
BiFeO3 films; Pyroelectric effect; Photovoltaic effect; Self-polarization; Band bending
Categories
Funding
- National Natural Science Foundation of China [51872074, 51790492]
- China Postdoctoral Science Foundation [2020M672207]
- Program for Innovative Research Team in Science and Technology in University of Henan Province [19IRTSTHN019]
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This study investigates the integration of pyroelectric and photovoltaic effects in BFO/Au/ZnO heterostructures, demonstrating superior photoelectric performance.
The photovoltaic properties of ferroelectric films and ferroelectric-semiconductor heterostructures have been extensively studied due to their application prospects in photodetection, energy conversion and nonvolatile storage. However, light-induced pyroelectric effect accompanied by the photovoltaic effect of ferroelectricsemiconductor heterostructures lacks sufficient attention. Herein, BiFeO3 (BFO)/Au/ZnO heterostructures are constructed by controlling sputtering time of Au nanoparticles and the regulation mechanism of integrating pyroelectric and photovoltaic effects is explored. The short-circuit photocurrent density of the optimal BFO/Au/ZnO heterostructures is nearly 1.4 times that of BFO/ZnO heterostructures under 405 nm light illumination. Moreover, BFO/Au/ZnO heterostructures broaden the response wavelength from 360 nm to 1060 nm light beyond the bandgap limitation. Compared with merely the photovoltaic effect found in BFO films and BFO/ZnO heterostructures, BFO/Au/ZnO heterostructures display the photovoltaic-pyroelectric coupled effect that is associated with light-induced temperature variation rate and band alignment by introducing Au nanoparticles into BFO and ZnO layers. The implementation of the photovoltaic-pyroelectric coupled effect endows BFO/Au/ZnO heterostructures with outstanding photoelectric performances modulated by self-polarization phenomenon and band bending. This work not only provides in-depth understanding about the photovoltaic-pyroelectric coupled effect of ferroelectric-metal-semiconductor heterostructures, but also provides an effective and facile route to design high-performance photoelectric related devices with wideband response.
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