Flexible Self‐Powered Electrochemical Photodetector Functionalized by Multilayered Tantalum Diselenide Nanocrystals. Issue 22 (31st August 2021)

• Record Type: Journal Article
• Authors: Chauhan, Payal; Patel, Alkesh B.; Solanki, Gunvant K.; Machhi, Hiren K.; Soni, Saurabh S.; Pathak, Vivek M.; Patel, Vikas; Narayan, Som; Jha, Prafulla K.
• Is Part Of: Advanced optical materials. Volume 9:Issue 22(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-08-31
• Subjects: flexible photodetectors -- liquid‐phase exfoliation -- self‐powered photoresponse -- TaSe 2; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202100993
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Few layered transition metal dichalcogenides (TMDCs) are widely used in electrochemical systems due to their unique optical and electronic properties including applications over a large area. Despite the widespread use of 2D layered materials as active components of photoanode, electrochemical conversion studies of few‐layered Tantalum diselenide (TaSe2 ) are still negligible. In view of this, the TaSe2 nanocrystals (NCs) are successfully synthesized by using the facile liquid‐phase exfoliation (LPE) approach. Different physiochemical characterization confirms the inherent physical and optical properties of TaSe2 NCs. The flexible self‐powered photoelectrochemical (PEC) type photodetector based on TaSe2 NCs achieves the highest photocurrent density ( Pph ) of 20.8 µA cm −2 and photoresponsivity ( Rph ) of 0.208 mA W −1 in 0.5 m KOH. TaSe2 NCs demonstrate the excellent self‐driven ability and also unveil decent response under applied bias potential in different concentration of KOH electrolyte. Moreover, the electrode shows excellent ON/OFF switching stability up to 1000 s even after the 1 month of storage in the air. Importantly, the photodetector retains the Pph of 15.8 µA cm −2 after 95 bending cycles of 120° angle, displaying the great flexibility of TaSe2 NCs. This work demonstrates the potential of TaSe2 NCs for their extended application in PEC‐type devices and flexible electronics. Abstract : A TaSe2 nanocrystals‐based flexible photoelectrochemical (PEC) type photodetector is fabricated for the first time using simple liquid‐phase exfoliation (LPE). With a photoresponsivity of 0.208 mA W −1, TaSe2 nanocrystals exhibit outstanding self‐powered photodetection capabilities, which is greater than previously reported values. After several bending cycles, the electrode showed excellent bending stability and retain ≈70% of its initial photocurrent density.