Intermediate band to conduction band optical absorption in ZnTeO

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. y 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.

Descripción

Título: Intermediate band to conduction band optical absorption in ZnTeO
Autor/es:
  • 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
Tipo de Documento: Artículo
Título de Revista/Publicación: IEEE Journal of Photovoltaics
Fecha: 2014
Volumen: 4
Materias:
Palabras Clave Informales: High-efficiency solar cells, infrared absorption, intermediate band solar cells (IBSC), novel photovoltaic concepts
Escuela: E.T.S.I. Telecomunicación (UPM)
Departamento: Electrónica Física
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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).

Más información

ID de Registro: 35793
Identificador DC: http://oa.upm.es/35793/
Identificador OAI: oai:oa.upm.es:35793
Identificador DOI: 10.1109/JPHOTOV.2014.2305903
URL Oficial: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6811146
Depositado por: Memoria Investigacion
Depositado el: 22 Jun 2015 18:09
Ultima Modificación: 22 Jun 2015 18:09
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