V2O5 Nanosheets for Flexible Memristors and Broadband Photodetectors

Yalagala, Bhavaniprasad and Sahatiya, Parikshit and Kolli, Chandra Sekhar Reddy and Khandelwal, Shivam and Mattela, Venkat and Badhulika, Sushmee (2019) V2O5 Nanosheets for Flexible Memristors and Broadband Photodetectors. ACS Applied Nano Materials. ISSN 2574-0970

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Abstract

Synthesis of vanadium oxide family compounds is challenging owing to their affinity to exist in different oxidation states and is further intensified by the lack of suitable techniques for their direct growth on flexible substrates thus limiting their applications in flexible electronics. In this report, we demonstrate one-step fabrication of two dimensional(2D) V2O5 based versatile papertronics (paper electronics) platform on low cost cellulose paper substrate and its application towards broadband photo detection and resistive memories. The porous nature of cellulose paper helps in the uniform growth of 2D V2O5 not only on the surface but also in bulk thereby assisting in the easy diffusion of silver ions(Ag+) in the defect sites of V2O5 unlike in conventional flexible polymeric substrates thereby assisting in the resistive switching mechanism. 2D V2O5 on cellulose paper based memory exhibited ON/OFF ratio to be 3.5 x 102 and the Vset and Vreset voltage to be ~ +1V and -1V respectively with excellent endurance and the retention capacity up to 500 cycles. The synthesized 2D V2O5 nanosheets exhibited broadband absorption ranging from ultraviolet (UV) to visible region with an optical bandgap calculated to be 2.4 eV making it suitable for broadband photodetection. Responsivity under UV and visible light illumination were found to be 31.5 mA/W and 20.2 mA/W respectively which are better than V2O5 based photodetectors fabricated using sophisticated methods. The fabricated broadband photodetector exhibited excellent mechanical stability with excellent retention in responsivity values over 500 cycles. The strategy outlined here presents a novel, low cost and one step approach for fabricating devices on paper that find wide applications in flexible electronics.

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