Enhanced performance of ultraviolet photodetector based on amorphous Ga2O3 films through formation of heterojunction with ZnO nanoparticles

Mi, Wei; Luo, Liyuan; He, Lin’an; Wang, Di; Zhou, Liwei; Zhu, Yan; Xiao, Longfei; Xu, Mingsheng; Zhang, Xingcheng; Qi, Dongdong; Luan, Chongbiao; Zhao, Jinshi

doi:10.1016/j.mssp.2024.108174

Materials Science in Semiconductor Processing

2024

DOI: 10.1016/j.mssp.2024.108174

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Enhanced performance of ultraviolet photodetector based on amorphous Ga2O3 films through formation of heterojunction with ZnO nanoparticles

Wei Mi,

Liyuan Luo,

Lin’an He

et al.

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Vertically Graded Oxygen Vacancies in Amorphous Ga₂O₃ for Offsetting the Conventional Trade-Off between Photoresponse and Response Time in Solar-Blind Photodetectors

Kaur,

Dahiya,

Ahmed

et al. 2024

ACS Appl. Electron. Mater.

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Recently, amorphous Ga 2 O 3 -based photodetectors are garnering interest for their relative ease-of-growth at room temperature and their virtuous use in flexible electronics. However, a major concern that remains is the huge trade-off between key performance parameters, viz., photoresponse and response time. Being replete with oxygen vacancies, acting as trap centers, devices usually boast a large photoresponse but at the cost of longer response time due to prolonged carrier recombination. Most of remedial measures to offset this trade-off include oxygen vacancy engineering but in a continuous manner, implying creating/deleting vacancies throughout the film thickness, leading to a change in only one of the parameters. Herein, we propose defect engineering in amorphous Ga 2 O 3 by grading oxygen vacancies using an intermittent oxygen supply. XPS depth profile studies confirm gradation of vacancies, which may be accessed by applying a different bias, in resonance with electric field distribution simulations. Graded vacancy films show negligible persistent photoconductivity, a high PDCR of 3 × 10 3 , a high UV−vis rejection ratio of 1.49 × 10 4 , and a fast fall time of 85 ms as opposed to continuous supply films, which show either high photoresponse or fast speed (in seconds). This work provides a way to use graded oxygen vacancies as tool in defect engineering to offset the trade-off and achieve high photoresponse and fast response time in amorphous Ga 2 O 3 films simultaneously.

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Vertically Graded Oxygen Vacancies in Amorphous Ga₂O₃ for Offsetting the Conventional Trade-Off between Photoresponse and Response Time in Solar-Blind Photodetectors

Kaur,

Dahiya,

Ahmed

et al. 2024

ACS Appl. Electron. Mater.

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Enhanced performance of ultraviolet photodetector based on amorphous Ga2O3 films through formation of heterojunction with ZnO nanoparticles

Cited by 1 publication

References 47 publications

Vertically Graded Oxygen Vacancies in Amorphous Ga₂O₃ for Offsetting the Conventional Trade-Off between Photoresponse and Response Time in Solar-Blind Photodetectors

Vertically Graded Oxygen Vacancies in Amorphous Ga₂O₃ for Offsetting the Conventional Trade-Off between Photoresponse and Response Time in Solar-Blind Photodetectors

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Enhanced performance of ultraviolet photodetector based on amorphous Ga2O3 films through formation of heterojunction with ZnO nanoparticles

Cited by 1 publication

References 47 publications

Vertically Graded Oxygen Vacancies in Amorphous Ga2O3 for Offsetting the Conventional Trade-Off between Photoresponse and Response Time in Solar-Blind Photodetectors

Vertically Graded Oxygen Vacancies in Amorphous Ga2O3 for Offsetting the Conventional Trade-Off between Photoresponse and Response Time in Solar-Blind Photodetectors

Contact Info

Product

Resources

About

Vertically Graded Oxygen Vacancies in Amorphous Ga₂O₃ for Offsetting the Conventional Trade-Off between Photoresponse and Response Time in Solar-Blind Photodetectors

Vertically Graded Oxygen Vacancies in Amorphous Ga₂O₃ for Offsetting the Conventional Trade-Off between Photoresponse and Response Time in Solar-Blind Photodetectors