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Enhanced Sensitivity in the VIS-NIR Range Under UV Light in a-SiC Pinpin Device

Authors:
Vitor Silva
Paula Louro
Manuel Augusto Vieira
Isabel Rodrigues
Manuela Vieira

Keywords: UV; VIS-NIR; Visible Light Communication; SiC technology.

Abstract:
The use of ultra-violet (UV) steady state illumination increases the spectral sensitivity of a pi’npin photodiode beyond the visible spectrum. Increased sensitivity in the range of 400-850 nm is experimentally demonstrated. The pi’npin photodiode can be illuminated back and front sides. Under front irradiation and low power intensity the gain is high and presents a well defined peak at 750 nm and strongly quenches in the visible range. As the power irradiation increases the peak shifts to the visible range and can be deconvoluted into two peaks, one in the red range and another in the green range. Under back irradiation the gain is high in the violet/blue ranges and strongly quenches for wavelengths higher than 550 nm, whatever the intensity of the background. Results show that, front background UV illumination enhances the light-to-dark sensitivity of the medium, opening a window in the visible and near infrared range (VIS-NIR). Background illumination with UV at the back enhances only the magnitude in short wavelength range opening a window in the UV and blue ranges.

Pages: 17 to 20

Copyright: Copyright (c) IARIA, 2014

Publication date: November 16, 2014

Published in: conference

ISSN: 2308-4405

ISBN: 978-1-61208-374-2

Location: Lisbon, Portugal

Dates: from November 16, 2014 to November 20, 2014