ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Gain mechanism and carrier transport in high responsivity AlGaN-based solar blind metal semiconductor metal photodetectors

Rathkanthiwar, Shashwat and Kalra, Anisha and Solanke, Swanand V and Mohta, Neha and Muralidharan, Rangarajan and Raghavan, Srinivasan and Nath, Digbijoy N (2017) Gain mechanism and carrier transport in high responsivity AlGaN-based solar blind metal semiconductor metal photodetectors. In: JOURNAL OF APPLIED PHYSICS, 121 (16).

[img] PDF
Jou_App_Phy_121-16_164502_2017.pdf - Published Version
Restricted to Registered users only

Download (2MB) | Request a copy
Official URL: http://dx.doi.org/10.1063/1.4982354

Abstract

We report on the highest responsivity for III-nitride Metal Semiconductor Metal solar-blind photodetectors on sapphire. Devices on unintentionally doped AlGaN epilayers grown by Metal Organic Chemical Vapor Deposition exhibited sharp absorption cut-off in the range of 245-290 nm. Very high responsivity >5 A/W at 10V bias was achieved with visible rejection exceeding three orders of magnitude for front illumination. Compared to the responsivity values reported in the literature for state-of-the-art solar-blind photodetectors, this work presents the highest values of responsivity at a given bias and up to sub-250 nm detection threshold. The high responsivity is attributed to an internal gain mechanism operating on these devices. The reverse-bias leakage current across these samples was found to be dominated by thermionic field emission at low biases and Poole-Frenkel emission from a deep trap level (0.7 eV from the conduction band-edge for Al0.50Ga0.50N) at high biases. Published by AIP Publishing.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Department/Centre: Division of Interdisciplinary Research > Centre for Nano Science and Engineering
Depositing User: Id for Latest eprints
Date Deposited: 03 Jun 2017 09:40
Last Modified: 03 Jun 2017 09:40
URI: http://eprints.iisc.ac.in/id/eprint/57103

Actions (login required)

View Item View Item