Coaxial SnS2/SnS Nanostructures on the Ag Fiber Substrate for Flexible Self-Powered Photodetectors

Badhulika, Sushmee (2023) Coaxial SnS2/SnS Nanostructures on the Ag Fiber Substrate for Flexible Self-Powered Photodetectors. ACS Applied Nano Materials, 6 (5). pp. 3863-3872. ISSN 2574-0970

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Sustainable and stable photodetectors with self-powering nature and superior performance are necessary to address the growing demand for flexible and wearable optoelectronic devices. This work demonstrates a flexible, self-powered, coaxial p-n heterojunction photodetector using SnS2/SnS on an Ag fiber substrate by coupling the photoexcitation property, semiconductor nature, and piezoelectric effect. Detailed characterization studies confirm the formation of hexagonal and orthorhombic crystal planes of SnS2 and SnS nanoflakes, respectively, with a piezoelectric coefficient (d33) of 175 pm/V for SnS2. The photoabsorption is maximum in the visible region with a direct band gap of 2.1 eV. The electrical studies display a tunable photoresponse under zero-bias conditions. Upon compressive strain of 0.43%, the photoresponse increases by 36%. The Ion/Ioff ratio of the fabricated photodetector was 102 at a zero bias, and the rise and decay times shorter than 1 s were obtained. The maximum external quantum efficiency of the fabricated photodetector was found to be 54.2%, owing to the superior piezo-phototronic properties. The band diagram and the charge transfer mechanism are studied to investigate the piezo-phototronic effect. The uniform strain on the Ag fiber substrate and the piezo-potential distribution upon compressive and tensile strain promotes carrier separation in the coaxial interfaces of the p-n junction. The demonstrated strategy provides a direction for developing fiber-based photodetectors with self-powering behavior and enhanced photoresponsivity for next-generation smart wearable textile-based applications.

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IITH Creators:
IITH CreatorsORCiD
Item Type: Article
Uncontrolled Keywords: coaxial p−n junction; fiber-based substrate; photodetectors; piezo-phototronic; self-powered; SnS2/SnS; Substrates; Coaxial p−n junction; Fiber substrates; Fiber-based substrate; P-n junction; Photoresponses; Piezo-phototronic; Property; Self-powered; Self-powering; SnS2/SnS; Charge transfer; Energy gap; Fibers; Flexible electronics; Heterojunctions; IV-VI semiconductors; Layered semiconductors; Photodetectors; Photons; Piezoelectricity; Semiconducting tin compounds; Sulfur compounds; Tensile strain; Wearable technology
Subjects: Electrical Engineering
Electrical Engineering > Electrical and Electronic
Divisions: Department of Electrical Engineering
Depositing User: Mr Nigam Prasad Bisoyi
Date Deposited: 27 Aug 2023 09:22
Last Modified: 27 Aug 2023 09:22
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