Int. J. Metrol. Qual. Eng.
Volume 8, 2017
|Number of page(s)||7|
|Published online||09 October 2017|
Development and characterization of a ZnO/Ge photodiode for optical radiation measurements in the near infrared
Metrology Team of Radiometric and Pyrometric Measurements, Carthage University, National Institute of Applied Science and Technology,
INSAT BP676 Centre Urbain Nord,
Tunis Cedex, Tunisia
2 University Campus Farhat Hachad, Tunis, El Manar University, Faculty of Sciences of Tunis, Tunis, Tunisia
* Corresponding author: email@example.com
Accepted: 2 May 2017
The metrology group of radiometric and pyrometric measurements of INSAT include among others the development of detectors that will be used as a standard in the MMA Laboratory for optical radiation measurements in the visible and infrared spectral range. In this work, we present the design and realization of a detector for near infrared radiation measurements: it is a photodiode ZnO/Ge based on a germanium junction and a thin layer of zinc oxide. Then we electrically and optically characterized the photodiode thus realized, for which we developed an energy band diagram. The obtained results have allowed us to note an improvement in the optical and electrical characteristics of the ZnO/Ge photodiode, compared to those performed in our laboratory and based on single Germanium. The reflectivity is reduced by about 9% for the wavelength range of 800 nm to 2000 nm. The shunt resistance increases from 95 Ω to 12.915 kΩ. However, the series resistance increases from 1.08 Ω to 36 Ω but it is still an acceptable value. The proposed energy band diagram explains the charge carrier transport phenomena for our structure and it is in good agreement with experimental results.
Key words: photodiode / zinc oxide / transfer detector / reflectivity / radiometric measurements
© Z. Ben Achour et al., published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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