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Synthesis of n-AlGaN Nanoflowers by MOCVD for High-Performance Ultraviolet-C Photodetector


AlxGa1-xN nanostructures based ultraviolet-c photodetectors have attracted nascent research attention owing to the low cost, tunable band gap, simple operation, smaller and lightweight systems. However, synthesis of high quality AlxGa1-xN nanostructures by MOCVD has been limited by complex multi-component phase diagram and inhomogeneous composition. Here, we report the synthesis of Si-doped n-type compositionally uniform Al0.45Ga0.55N alloy with flower-like morphology (nanoflowers) by MOCVD. Quasi vertically aligned and preferentially c-axis oriented n-AlGaN nanoflowers consist of large number of self-assembled one-dimensional nanowires which tend to grow radially from the center. The n-AlGaN nanowires are single crystalline and grow along (0002) direction. Low temperature (88 K) cathodoluminescence spectra of AlGaN nanoflowers displayed strong band edge emission at ~ 280 nm, which is shifted to ~ 292 nm at room temperature. Photoresponsivity and sensitivity of the ultraviolet-c photodetectors fabricated with n-AlGaN nanoflowers are ~ 0.72 A/W and ~ 40 %, respectively, at 2 V. The nanoflowers based device exhibited remarkably superior photoresponse characteristics to the device fabricated with AlGaN nanorods or nanowires which were synthesized under different MOCVD growth conditions. Large surface-to-volume ratio and higher density of nanoflowers enhance photon absorption which resulting in photocurrent gain, substantially high quantum efficiency and hence improved photoresponse characteristics.

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Publication details

The article was received on 14 Nov 2017, accepted on 02 Jan 2018 and first published on 03 Jan 2018

Article type: Paper
DOI: 10.1039/C7TC05182D
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Synthesis of n-AlGaN Nanoflowers by MOCVD for High-Performance Ultraviolet-C Photodetector

    S. Kang, R. Nandi, H. Kim, K. Jeong and C. Lee, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC05182D

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