Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 928, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.167126
Keywords
NiO; Core-shell heterojunction; Self-powered PDs
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Funding
- National Natural Science Foundation of China [51871167, 51971158, 52271187]
- Natural Science Foundation of Tianjin [18JCYBJC86200]
- Scientific Developing Foundation of Tianjin Education Commission [2018ZD09]
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In this work, a self-powered UV photodetector based on TiO2/NiO core-shell heterojunction arrays is fabricated. The device exhibits a large photocurrent and high responsivity under self-powered mode.
Self-powered ultraviolet photodetectors (UV PDs) are urgently needed for portable, sustainable, maintenance free, and long-term applications. The geometry of device structure and interface energy band arrangement will affect the photoresponse performance of heterojunction PDs. In this work, a self-powered UV PDs based on match like quasi one-dimensional TiO2/NiO core-shell heterojunction arrays is fabricated by RF magnetron depositing NiO over TiO2 NRs. By controlling sputtering power, NiO(50 W)/TiO2, NiO (80 W)/TiO2 and NiO(120 W)/TiO2 devices were obtained. Under self-powered mode, the performance of PDs is carefully explored and the NiO (80 W)/TiO2 device displays a large photocurrent (1.2 x10-6 A) and a high responsivity (74 mA/W) at 380 nm light irradiation. The results presented in this work suggest that a comprehensive consideration and a reasonable optimization of interface energy level structure and carrier transmission is the important for developing high-performance self-powered UV PDs. (c) 2022 Elsevier B.V. All rights reserved.
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