Polarity switching of the photo-induced voltage in YBCO/Ag heterojunction. (March 2020)

• Record Type: Journal Article
• Authors: Yang, Feng; Liu, Hui; Liu, Hairui; Lu, Qingfeng; Chang, Fanggao
• Is Part Of: Journal of physics and chemistry of solids. Volume 138(2020)
• Publication Date: 2020-03
• Subjects: YBCO/Ag heterojunction -- Photo-voltage effect -- Polarity switching; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2019.109232
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: Striking photo-induced voltage is observed in YBCO/Ag heterojunction irradiated with purple laser, revealing that there is an intrinsic built-in electric field in the interface. The dynamic evolution and devolution processes of the photo-induced voltage are studied at 50 K and 300 K respectively, which are found to be similar to a charging and a discharging process of a plate capacitor. Unusual Current-Voltage properties curves obtained at 80 K with 28.4 mW/mm 2 laser irradiation implies a polarity switching of the built-in electric field in the interface and witnesses a redistribution of charges near the interface of the heterojunction. This research would suggest a new method to study the proximity effect in the interface of superconductor/metal heterojunction. Highlights: Striking photo-induced voltage is observed in YBCO/Ag heterojunction irradiated with purple laser. The dynamic evolution and devolution processes of the photo-induced voltage. Unusual I-V curve witnesses a polarity switching of the built-in electrical field in the interface.