Memorias de investigación
Artículos en revistas:
Experimental verification of intermediate band formation on titanium-implanted silicon
Año:2013
Áreas de investigación
  • Dispositivos electrónicos,
  • Células solares
Datos
Descripción
Intermediate band formation on silicon layers for solar cell applications was achieved by titanium implantation and laser annealing. A two-layer heterogeneous system, formed by the implanted layer and by the un-implanted substrate, was formed. In this work, we present for the first time electrical characterization results which show that recombination is suppressed when the Ti concentration is high enough to overcome the Mott limit, in agreement with the intermediate band theory. Clear differences have been observed between samples implanted with doses under or over the Mott limit. Samples implanted under the Mott limit have capacitance values much lower than the un-implanted ones as corresponds to a highly doped semiconductor Schottky junction. However, when the Mott limit is surpassed, the samples have much higher capacitance, revealing that the intermediate band is formed. The capacitance increasing is due to the big amount of charge trapped at the intermediate band, even at low temperatures. Ti deep levels have been measured by admittance spectroscopy. These deep levels are located at energies which vary from 0.20 to 0.28?eV below the conduction band for implantation doses in the range 1013-1014 at./cm2. For doses over the Mott limit, the implanted atoms become nonrecombinant. Capacitance voltage transient technique measurements prove that the fabricated devices consist of two-layers, in which the implanted layer and the substrate behave as an n+/n junction.
Internacional
Si
JCR del ISI
Si
Título de la revista
Journal of Applied Physics
ISSN
0021-8979
Factor de impacto JCR
2,21
Información de impacto
Volumen
113
DOI
Número de revista
Desde la página
024104
Hasta la página
024110
Mes
SIN MES
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Participantes
  • Autor: H. Castán
  • Autor: E. Pérez
  • Autor: H. García
  • Autor: S. Dueñas
  • Autor: L. Bailón
  • Autor: Javier Olea Ariza UPM
  • Autor: D Pastor
  • Autor: E. García-Hemme
  • Autor: M. Irigoyen
  • Autor: G. González-Diaz
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Silicio y Nuevos Conceptos para Células Solares
  • Centro o Instituto I+D+i: Instituto de Energía Solar