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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Femtosecond-laser induced two-photon absorption of GaN and AlxGa1-xN thin films: Tuning the nonlinear optical response by alloying and doping

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Author(s):
Vivas, M. G. [1] ; Manoel, D. S. [2] ; Dipold, J. [2] ; Martins, R. J. [2] ; Fonseca, R. D. [3] ; Manglano-Clavero, I [4, 5] ; Margenfeld, C. [4, 5] ; Waag, A. [4, 5] ; Voss, T. [4, 5] ; Mendonca, C. R. [2]
Total Authors: 10
Affiliation:
[1] Univ Fed Alfenas, Lab Espectroscopia Opt & Foton, Pocos De Caldas, MG - Brazil
[2] Univ Sao Paulo, Sao Carlos Inst Phys, Sao Carlos, SP - Brazil
[3] Univ Popular Cesar, Dept Fis, Valledupar 2000004, Cesar - Colombia
[4] Tech Univ Carolo Wilhelmina Braunschweig, Inst Semicond Technol, Braunschweig - Germany
[5] Tech Univ Carolo Wilhelmina Braunschweig, Lab Emerging Nanometrol LENA, Braunschweig - Germany
Total Affiliations: 5
Document type: Journal article
Source: Journal of Alloys and Compounds; v. 825, JUN 5 2020.
Web of Science Citations: 0
Abstract

Semiconductors thin films are the foundation of modern technology. While the nonlinear optical (NLO) properties of bulk semiconductors have been systematically studied in the last three decades, it is still a great challenge to obtain them for semiconductors thin films, as the high laser irradiance in NLO experiments tends to irreversibly damage the thin films. In addition, tuning the NLO response of semiconductor thin films by alloying and doping has not been explored yet. Here, we study the influence of the Aluminum content in AlxGa1-xN thin films and the n-type doping concentration in GaN thin films on their two-photon absorption (2PA) coefficients. For this, we investigate five different GaN-based thin films: an unintentionally doped one with no Al as a reference, two n-type doped GaN films with distinct concentrations of silicon impurities, and two AlxGa1-xN alloys with an aluminum content of 5.5% and 9.0%, respectively. The femtosecond 2PA spectra reveal that doping impurities reduce the non-linear coefficients (similar to 10%), while alloying with Al enhances the 2PA coefficient up to 30%. We use the model of Brandi and Araujo to determine Kane's energy parameter related to the transition matrix element for each sample and compare them with recent theoretical studies based on the k.p theory where an excellent agreement is found. (C) 2020 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 15/20032-0 - Study on Nonlinear and Charge Transport Properties of Multi-branched Molecules via Quantum Chemical Methods.
Grantee:Daniel Luiz da Silva
Support Opportunities: Regular Research Grants
FAPESP's process: 18/11283-7 - Nonlinear photonics: spectroscopy and advanced processing of materials
Grantee:Cleber Renato Mendonça
Support Opportunities: Research Projects - Thematic Grants