Intermediate band to conduction band optical absorption in ZnTeO

Antolín Fernández, Elisa and Chen, C. and Ramiro Gonzalez, Iñigo and Foley, James and López Estrada, Esther and Artacho Huertas, Irene and Hwang, J. and Teran, A. and Hernández Martín, Estela and Tablero Crespo, César and Martí Vega, Antonio and Phillips, J.D. and Luque López, Antonio (2014). Intermediate band to conduction band optical absorption in ZnTeO. "IEEE Journal of Photovoltaics", v. 4 (n. 4); pp. 1091-1094. ISSN 2156-3381. https://doi.org/10.1109/JPHOTOV.2014.2305903.

Description

Title: Intermediate band to conduction band optical absorption in ZnTeO
Author/s:
  • Antolín Fernández, Elisa
  • Chen, C.
  • Ramiro Gonzalez, Iñigo
  • Foley, James
  • López Estrada, Esther
  • Artacho Huertas, Irene
  • Hwang, J.
  • Teran, A.
  • Hernández Martín, Estela
  • Tablero Crespo, César
  • Martí Vega, Antonio
  • Phillips, J.D.
  • Luque López, Antonio
Item Type: Article
Título de Revista/Publicación: IEEE Journal of Photovoltaics
Date: 2014
Volume: 4
Subjects:
Freetext Keywords: High-efficiency solar cells, infrared absorption, intermediate band solar cells (IBSC), novel photovoltaic concepts
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (1MB) | Preview

Abstract

ZnTe doped with high concentrations of oxygen has been proposed in previous works as an intermediate band (IB) material for photovoltaic applications. The existence of extra optical transitions related to the presence of an IB has already been demonstrated in this material and it has been possible to measure the absorption coefficient of the transitions from the valence band (VB) to the IB. In this study, we present the first measurement of the absorption coefficient associated with transitions from the IB to the conduction band (CB) in ZnTeO. The samples used are 4-mum-thick ZnTe layers with or without O in a concentration ~10 19 cm -3, which have been grown on semiinsulating GaAs substrates by molecular beam epitaxy (MBE). The IB-CB absorption coefficient peaks for photon energies ~0.4 eV. It is extracted from reflectance and transmittance spectra measured using Fourier transform infrared (FTIR) spectroscopy. Under typical FTIR measurement conditions (low light intensity, broadband spectrum), the absorption coefficient in IB-to-CB transitions reaches 700 cm -1. This is much weaker than the one observed for VB-IB absorption. This result is consistent with the fact that the IB is expected to be nearly empty of electrons under equilibrium conditions in ZnTe(O).

More information

Item ID: 35793
DC Identifier: http://oa.upm.es/35793/
OAI Identifier: oai:oa.upm.es:35793
DOI: 10.1109/JPHOTOV.2014.2305903
Official URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6811146
Deposited by: Memoria Investigacion
Deposited on: 22 Jun 2015 18:09
Last Modified: 22 Jun 2015 18:09
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM