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Surface-Engineered Nanostructure-Based Efficient Nonpolar GaN Ultraviolet Photodetectors

IR@NPL: CSIR-National Physical Laboratory, New Delhi

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Title Surface-Engineered Nanostructure-Based Efficient Nonpolar GaN Ultraviolet Photodetectors
Creator Mishra, Monu
Gundimeda, Abhiram
Krishna, Shibin
Aggarwal, Neha
Goswami, Lalit
Gahtori, Bhasker
Bhattacharyya, Biplab
Husale, Sudhir
Gupta, Govind
Subject Chemistry
Description Surface-engineered nanostructured nonpolar (1120) gallium nitride (GaN)-based high-performance ultraviolet (UV) photodetectors (PDs) have been fabricated. The surface morphology of a nonpolar GaN film was modified from pyramidal shape to flat and trigonal nanorods displaying facets along different crystallographic planes. We report the ease of enhancing the photocurrent (5.5-fold) and responsivity (6-fold) of the PDs using a simple and convenient wet chemicaletching-induced surface engineering. The fabricated metal-semiconductor-metal structure-based surface-engineered UV PD exhibited a significant increment in detectivity, that is, from 0.43 to 2.83 ( x10(8)) Jones, and showed a very low noiseequivalent power (similar to 10(-10) W Hz(-1/2)). The reliability of the nanostructured PD was ensured via fast switching with a response and decay time of 332 and 995 ms, which were more than five times faster with respect to the unetched pyramidal structure-based UV PD. The improvement in device performance was attributed to increased light absorption, efficient transport of photogenerated carriers, and enhancement in conduction cross section via elimination of recombination/trap centers related to defect states. Thus, the proposed method could be a promising approach to enhance the performance of GaN-based PD technology.
Publisher American Chemical Society
Date 2018-02
Type Article
Format application/pdf
Identifier http://npl.csircentral.net/4023/1/Surface-Engineered%20Nanostructure.pdf
Mishra, Monu and Gundimeda, Abhiram and Krishna, Shibin and Aggarwal, Neha and Goswami, Lalit and Gahtori, Bhasker and Bhattacharyya, Biplab and Husale, Sudhir and Gupta, Govind (2018) Surface-Engineered Nanostructure-Based Efficient Nonpolar GaN Ultraviolet Photodetectors. ACS Omega, 3 (2). pp. 2304-2311. ISSN 2470-1343
Relation http://npl.csircentral.net/4023/