Enhanced photodetector at low-temperature via thermo-phototronic effect in N-type SnSe:Br single crystal. (March 2023)

• Record Type: Journal Article
• Authors: Yang, Lili; Wu, Liyun; Su, Lizhong; Xu, Lan; Zhao, Li-Dong; Yang, Ya
• Is Part Of: Nano energy. Volume 107(2023)
• Publication Date: 2023-03
• Subjects: SnSe:Br single crystal -- Low-temperature -- Self-powered -- Photodetector -- Thermo-phototronic effect; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2022.108140
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Self-powered photodetectors play an important role in building passive monitoring networks and interactive intelligent platforms. However, when low-temperature, the degradation of performance always plagues the development of photovoltaic-based photodetectors, especially in the adaptation of photovoltaic conversion technology to environmental diversification. We adopt an emerging bromine doped n-type SnSe thermoelectric single crystal as a core element with Ag/SnSe:Br/ITO structure to achieve the low-temperature enhanced photoelectric performance, which originates from the thermo-phototronic effect of thermoelectric materials. When the temperature drops from 300 K to 100 K, the response current and voltage of Ag/SnSe:Br/ITO device increase by 139% and 696%, respectively. In addition, the responsivity and specific detectivity of the device at 100 K are 7.95 and 2.74 times higher than those at 300 K, respectively, which enhanced output performance at low-temperature may be related to the acceleration of photogenerated electrons caused by the driving force of the thermoelectric effect. This work provides a simple structure, low-temperature enhanced photodetectors. Graphical Abstract: Currently reported photodetectors based on thermoelectric materials are mainly focused on room-temperature or high-temperature environment, and there is a lack of research on low-temperature. In order to enhance the environmental adaptability of photodetectors, we report a simple structure of photodetector, which is the first to achieve enhanced photovoltaic performance at low-temperature in a thermoelectric material. When the temperature drops from 300 K to 100 K, the responsivity and specific detectivity of Ag/SnSe:Br/ITO device increase by 795% and 274%, respectively. This work provides a favourable direction for the research of low-temperature enhanced photodetectors. ga1 Highlights: The low-temperature enhancement of photodetectors based on thermoelectric materials was verified for the first time. When the temperature drops from 300 K to 100 K, the response current and voltage of device increase by 139% and 696%. The responsivity and specific detectivity of the device at 100 K are 7.95 and 2.74 times higher than those at 300 K. This research is a useful guide for the study of low-temperature high-performance photodetectors.