Optical properties of ZnMgO films grown by spray pyrolysis and their application to UV photodetection

Lopez Ponce, Manuel and Hierro Cano, Adrián and Marín Borras, V. and Tabares Jimenez, Gema and Kurtz de Griñó, Alejandro and Muñoz Merino, Elias and Albert, Steven and Agouram, Said and Muñoz Sanjosé, Vicente and Ulloa Herrero, José María (2015). Optical properties of ZnMgO films grown by spray pyrolysis and their application to UV photodetection. "Semiconductor Science and Technology", v. 30 (n. 10); pp.. ISSN 0268-1242. https://doi.org/10.1088/0268-1242/30/10/105026.

Description

Title: Optical properties of ZnMgO films grown by spray pyrolysis and their application to UV photodetection
Author/s:
  • Lopez Ponce, Manuel
  • Hierro Cano, Adrián
  • Marín Borras, V.
  • Tabares Jimenez, Gema
  • Kurtz de Griñó, Alejandro
  • Muñoz Merino, Elias
  • Albert, Steven
  • Agouram, Said
  • Muñoz Sanjosé, Vicente
  • Ulloa Herrero, José María
Item Type: Article
Título de Revista/Publicación: Semiconductor Science and Technology
Date: September 2015
ISSN: 0268-1242
Volume: 30
Subjects:
Freetext Keywords: ZnO, photodetectors, ZnMgO, spray pyrolysis, optical characterization, Stokes shift, MSM
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Ingeniería Electrónica
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This work presents a comprehensive optical characterization of Zn1−xMgxO thin films grown by spray pyrolysis (SP). Absorption measurements show the high potential of this technique to tune the bandgap from 3.30 to 4.11 eV by changing the Mg acetate content in the precursor solution, leading to a change of the Mg-content ranging from 0 up to 35%, as measured by transmission electron microscopy-energy dispersive x-ray spectroscopy. The optical emission of the films obtained by cathodoluminescence and photoluminescence spectroscopy shows a blue shift of the peak position from 3.26 to 3.89 eV with increasing Mg incorporation, with a clear excitonic contribution even at high Mg contents. The linewidth broadening of the absorption and emission spectra as well as the magnitude of the observed Stokes shift are found to significantly increase with the Mg content. This is shown to be related to both potential fluctuations induced by pure statistical alloy disorder and the presence of a tail of band states, the latter dominating for medium Mg contents. Finally, metal–semiconductor–metal photodiodes were fabricated showing a high sensitivity and a blue shift in the cut-off energy from 3.32 to 4.02 eV, i.e., down to 308 nm. The photodiodes present large UV/dark contrast ratios (102 − 107), indicating the viability of SP as a growth technique to fabricate low cost (Zn, Mg)O-based UV photodetectors reaching short wavelengths.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainTEC2011-28076-C02-01/02UnspecifiedUnspecifiedUnspecified
Government of SpainTEC2014-60173-C2-2UnspecifiedUnspecifiedUnspecified

More information

Item ID: 40784
DC Identifier: http://oa.upm.es/40784/
OAI Identifier: oai:oa.upm.es:40784
DOI: 10.1088/0268-1242/30/10/105026
Official URL: http://iopscience.iop.org/article/10.1088/0268-1242/30/10/105026
Deposited by: Memoria Investigacion
Deposited on: 14 Jun 2016 15:58
Last Modified: 05 Jun 2019 15:14
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