Simulation and Experimental Studies of Illumination Effects on the Current Transport of Nitridated GaAs Schottky Diode

A. Rabehi; L. Bideux; B. Gruzza; G. Monier; A. Hatem-Kacha; M. Guermoui; A. Ziane; B. Akkal; Z. Benamara; M. Amrani; C. Robert-Goumet

doi:10.1134/S106378261816025X

Simulation and Experimental Studies of Illumination Effects on the Current Transport of Nitridated GaAs Schottky Diode

Authors: Rabehi A.¹^,2, Bideux L.³, Gruzza B.³, Monier G.³, Hatem-Kacha A.¹, Guermoui M.⁴, Ziane A.¹, Akkal B.¹, Benamara Z.¹, Amrani M.¹, Robert-Goumet C.³
Affiliations:
1. Laboratoire de Micro-électronique Appliquèe, Université Djillali Liabès de Sidi Bel Abbés,
2. Departement d´électronique, Institut des sciences et des technologies, Centre universitaire de Tissemsilt
3. Institut Pascal, Université Clermont Auvergne, CNRS, SIGMA Clermont
4. Unité de Recherche Appliquée en Energies Renouvelables, URAER, Centre de Développement des Energies Renouvelables, CDER
Issue: Vol 52, No 16 (2018)
Pages: 1998-2006
Section: Physics of Semiconductor Devices
URL: https://journals.rcsi.science/1063-7826/article/view/205263
DOI: https://doi.org/10.1134/S106378261816025X
ID: 205263

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Abstract

In this paper, we studied the electrical characteristic of Schottky diodes based on gold contact on nitridated GaAs substrates. The used (100) GaAs substrate is n-type with concentration of N_d = 4.9 × 10¹⁵ cm^–3. Nitridation process was performed using a N2 glow discharge source (GDS) creating N atomic species. A ultra-thin film with a thickness of 2.2 nm GaN is performed on GaAs surface. In order to study the electric characteristics under illumination, we use of a He–Ne laser of 1 mW power and 632.8 nm wavelength. The current–voltage (I–V) of the Au/GaN/GaAs structures was investigated at room temperature. The saturation current I_S, the series resistance R_S and the mean ideality factor n are, respectively, equal to 4.46 × 10^–07 A, 172 Ohm, 1.4 in the dark and to 5.64 × 10^–07 A, 148 Ohm, 1.21 under illumination. To analyze these results, a 1D-simulation code of forward and reverse current–voltage characteristics versus the critical parameters of a nitridated GaAs Schottky diode is implemented. The algorithm is based on the solution of the system composed by Poisson’s and continuities equations. In this calculation, we take into account the existence of the GaN layer and the localization of traps states in the perturbed interface. We have considered the W-shaped and U-shaped distribution of traps states in the band gap. The effects of the doping concentration of GaAs, the traps states density, light intensities and the work function of gold \({{\phi }_{m}}\) are investigated. By fitting the experimental curve, we can deduce the values of the traps states and the exact value of the work function of gold, and consequently we validate the developed model.

Keywords

Au/GaN/GaAs, Schottky diode, photoelectrical, traps states, DOS, W–U-shaped distribution, surface nitridation.

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Simulation and Experimental Studies of Illumination Effects on the Current Transport of Nitridated GaAs Schottky Diode

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