Enhancement of visible light photodetector performance for ultrafast switching using flower shaped gallium nitride nanostructures

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-03-15
Major/Subject
Mcode
Degree programme
Language
en
Pages
5
Series
Scripta Materialia, Volume 194
Abstract
Well-defined Dahlia type gallium nitride flowers (GaNFs) have been synthesized on c-plane sapphire substrates at different growth conditions using chemical vapour deposition system. The growth was carried out without any catalyst medium for favouring the nucleation process. Crystal structure of the GaNFs was obtained using x-ray diffractometer (XRD). Scanning electron microscopy (SEM) revealed the morphology of GaNFs. The elemental traces and compositions of the samples were obtained using energy dispersive x-ray (EDX) spectroscopy and x-ray photoelectron spectroscopy (XPS). The optical properties of the samples were analysed using cathodoluminescence (CL) spectroscopy and Raman spectroscopy. From the current-voltage (I-V) response, it was observed that there are no interface and surface related inhomogeneities in the samples. The fabricated photodetector showcased good device performance due to high carrier density in the sample.
Description
Keywords
Gallium nitride nanostructure, Chemical vapour deposition, High carrier density, High performance photodetector
Other note
Citation
Sankaranarayanan , S , Kandasamy , P , Raju , R , Gengan , S & Krishnan , B 2021 , ' Enhancement of visible light photodetector performance for ultrafast switching using flower shaped gallium nitride nanostructures ' , Scripta Materialia , vol. 194 , 113711 . https://doi.org/10.1016/j.scriptamat.2020.113711