Jump to main content
Jump to site search


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

Abstract

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.

Back to tab navigation

Supplementary files

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
  •   Request permissions

    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

Search articles by author

Spotlight

Advertisements