title: Alternative Spectral Photoresponse in a p-Cu2ZnSnS4/n-GaN Heterojunction Photodiode by Modulating Applied Voltage.
abstract: We report alternative visible and ultraviolet light response spectra in a p-Cu2ZnSnS4 (p-CZTS)/n-GaN heterojunction photodiode. A CZTS film was deposited on an n-GaN/sapphire substrate using a magnetron sputtering method. Current-voltage characteristic of the p-CZTS/n-GaN heterojunction photodiode showed a good rectifying behavior. The spectral response measurements indicate that the response wavelength of the photodiode can be tuned from ultraviolet to visible regions via applying zero and reverse bias. A band alignment at the interface of the p-CZTS/n-GaN heterojunction was proposed to interpret the spectral response of the device.
authors.affiliation: †State Key Lab of Superhard Materials and College of Physics, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Gang
authors.initials: G
authors.lastname: Yang
authors.affiliation: †State Key Lab of Superhard Materials and College of Physics, Jilin University, Changchun 130012, People's Republic of China.|‡Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, China.
authors.forename: Yong-Feng
authors.initials: YF
authors.lastname: Li
authors.affiliation: †State Key Lab of Superhard Materials and College of Physics, Jilin University, Changchun 130012, People's Republic of China.|‡Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Yao
authors.affiliation: †State Key Lab of Superhard Materials and College of Physics, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Zhan-Hui
authors.initials: ZH
authors.lastname: Ding
authors.affiliation: §School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Deng
authors.affiliation: ∥State Key Laboratory on High-Power Semiconductor Lasers, Changchun University of Science and Technology, 7186 Wei-Xing Road, Changchun 130022, China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Fang
authors.affiliation: ∥State Key Laboratory on High-Power Semiconductor Lasers, Changchun University of Science and Technology, 7186 Wei-Xing Road, Changchun 130022, China.
authors.forename: Zhi-Peng
authors.initials: ZP
authors.lastname: Wei
keywords: Cu2ZnSnS4; GaN; heterojunction; magnetron sputtering; photodiode