Photoresponse in tilted Bi2Sr2Co2Oy thin films with nano-structured silver layer as the light absorber

Guoying Yan; Zilong Bai; Shifan Yang; Shufang Wang; Wei Yu; Jianglong Wang; Guangsheng Fu

doi:10.1117/12.2035541

23 December 2013 Photoresponse in tilted Bi₂Sr₂Co₂O_y thin films with nano-structured silver layer as the light absorber

Guoying Yan, Zilong Bai, Shifan Yang, Shufang Wang, Wei Yu, Jianglong Wang, Guangsheng Fu

Author Affiliations +

Proceedings Volume 9043, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing; 90430Q (2013) https://doi.org/10.1117/12.2035541
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

Abstract

Layered cobalt oxide thin films with tilted structures exhibit large light-induced transverse voltage signals due to the transverse thermoelectric effect and have great potential applications in uncooled broad-band light detectors. In this paper, we investigated the photoresponse in c-axis tilted Bi₂Sr₂Co₂O_y thin films coated with a layer of nano-structured silver light absorber by using a 532 nm continuous wave laser as the incident light. The incidence direction of the laser beam was directly perpendicular to the sample surface. The laser spot was located at the centre position between the two electrodes and its diameter was about 2 mm. The induced lateral voltage signals were recorded using a 2400 Keithley source meter. Open-circuit voltage signals were observed when the sample surface was illuminated by the 532 nmradiation. Appropriate lateral size and thickness of the nano-structured silver layer can increase the photo-thermal-electric conversion efficiency in this photoresponse process due to the effective absorption of the light at the absorption layer, leading to the improvement in voltage sensitivity. The result offers important guidance of designing the light absorption layer for high performance broad-band light detectors based on the light-induced transverse voltage effect.

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Guoying Yan, Zilong Bai, Shifan Yang, Shufang Wang, Wei Yu, Jianglong Wang, and Guangsheng Fu "Photoresponse in tilted Bi₂Sr₂Co₂O_y thin films with nano-structured silver layer as the light absorber", Proc. SPIE 9043, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 90430Q (23 December 2013); https://doi.org/10.1117/12.2035541

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KEYWORDS

Absorption

Silver

Coating

Thin films

Thermoelectric materials

Sensors

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