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Solvothermal Growth of PbBi 2 Se 4 Nano‐Flowers: A Material for Humidity Sensor and Photodetector Applications
Author(s) -
Aher Rahul,
Bhorde Ajinkya,
Nair Shruthi,
Borate Haribhau,
Pandharkar Subhash,
Naik Dhirsing,
Vairale Priti,
Karpe Smita,
Late Dattatray,
Prasad Mohit,
Jadkar Sandesh
Publication year - 2019
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201900065
Subject(s) - materials science , nano , photodetector , bismuth , quantum efficiency , indium tin oxide , optoelectronics , nanotechnology , layer (electronics) , composite material , metallurgy
In the present work, lead bismuth selenide (PbBi 2 Se 4 ) nano‐flowers are synthesized by using a simple solvothermal method. Humidity sensor and photodetector based on PbBi 2 Se 4 nano‐flowers are fabricated on indium tin oxide (ITO) substrates and their sensing properties are investigated. Formation of PbBi 2 Se 4 is confirmed by XRD, EDS, and XPS whereas formation of nano‐flowers is confirmed by SEM and TEM analysis. XRD analysis reveals the hexagonal crystal structure of PbBi 2 Se 4 phase with a = b = 4.22 Å, and c = 17.42 Å. The surface morphology of PbBi 2 Se 4 clearly shows the formation of well‐organized flower‐like nanostructures which closely resembles the shape of Dahlia. The elemental mapping of chemical constituents obtained from SEM‐EDS analysis shows uniform distribution of chemical constituents for the Pb, Bi, and Se in PbBi 2 Se 4 nano‐flowers. The PbBi 2 Se 4 nano‐flowers‐based humidity sensor has a typical response time of ≈65 s and recovery time of ≈75 s. In case of PbBi 2 Se 4 nano‐flowers‐based photodetector, the response and recovery time are observed ≈121 and ≈123 s, respectively, under visible light illumination with photoresponsivity (5 × 10 −6 ), photosensitivity (2.16%), and quantum efficiency (1.5 × 10 4 ). The obtained results demonstrate the potential applications of solvothermally grown PbBi 2 Se 4 nano‐flowers‐based devices for humidity sensors and photodetectors. The ease of the present work is to develop novel material to obtain device quality humidity sensors and photodetectors.