Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Vanadium supersaturated silicon system: a theoretical and experimental approach
Year:2017
Research Areas
  • Silicon,
  • Photovoltaic generation
Information
Abstract
The effect of high dose vanadium ion implantation and pulsed laser annealing on the crystal structure and sub-bandgap optical absorption features of V-supersaturated silicon samples has been studied through the combination of experimental and theoretical approaches. Interest in V-supersaturated Si focusses on its potential as a material having a new band within the Si bandgap. Rutherford backscattering spectrometry measurements and formation energies computed through quantum calculations provide evidence that V atoms are mainly located at interstitial positions. The response of sub-bandgap spectral photoconductance is extended far into the infrared region of the spectrum. Theoretical simulations (based on density functional theory and many-body perturbation in GW approximation) bring to light that, in addition to V atoms at interstitial positions, Si defects should also be taken into account in explaining the experimental profile of the spectral photoconductance. The combination of experimental and theoretical methods provides evidence that the improved spectral photoconductance up to 6.2 µm (0.2 eV) is due to new sub-bandgap transitions, for which the new band due to V atoms within the Si bandgap plays an essential role. This enables the use of V-supersaturated silicon in the third generation of photovoltaic devices.
International
Si
JCR
Si
Title
Journal of Physics D-Applied Physics
ISBN
0022-3727
Impact factor JCR
2,588
Impact info
Volume
50
10.1088/1361-6463/aa9360
Journal number
49
From page
495101-1
To page
495101-8
Month
SIN MES
Ranking
Participants
  • Autor: E. Garcia-Hemme
  • Autor: Gregorio Jose Garcia Moreno (UPM)
  • Autor: Pablo Palacios Clemente (UPM)
  • Autor: D. Montero
  • Autor: R. García-Hernansanz
  • Autor: G. González-Diaz
  • Autor: Perla Wahnon Benarroch (UPM)
Research Group, Departaments and Institutes related
  • Creador: Centro o Instituto I+D+i: Instituto de Energía Solar
  • Departamento: Física Aplicada a Las Ingenierías Aeronáutica y Naval
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)