Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Active materials based on implanted Si for obtaining intermediate band solar cells
Year:2010
Research Areas
  • Physics - Semiconductors and band structure
Information
Abstract
First-principles calculations carried out for compounds based on Si implanted with different species, as Ti or chalcogens (S, Se, Te), show them as solid candidates to intermediate band (IB) photovoltaic materials. This DFT study predicts electronic structures, formation energies,relaxed atomic structures, optoelectronic properties, diffusion paths, for supercells containing up to several hundreds of atoms. The knowledge of Si-based devices is a relevant factor to facilitate the creation of an IB solar cell. Crystalline samples with a concentration of Ti several orders of magnitude above the solubility limit have been already grown. Formation energy calculations agree with the experiment in showing mainly interstitial implantation. Calculated electronic structure presents an IB, which is in agreement with electrical measurements and models, and is expected to cause an increase of the absorption coefficient across the solar spectrum. Chalcogen-implanted Si is an efficient IR absorber when implantation is carried out at ultra-high concentrations. Substitutional implantation produces a filled band inside Si band-gap and our calculations predict that plausible co-doping with IIIA atoms (as Al, B) would allow to obtain an IB fulfilling all the needed requirements.
International
Si
JCR
No
Title
ADVANCES IN SCIENCE AND TECHNOLOGY
ISBN
1662-0356
Impact factor JCR
0
Impact info
Volume
74
Journal number
From page
151
To page
156
Month
ENERO
Ranking
Participants
  • Autor: Kefrén Sánchez Noriega (UPM)
  • Autor: Irene Aguilera Bonet (UPM)
  • Autor: Pablo Palacios Clemente (UPM)
  • Autor: Perla Wahnon Benarroch (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Silicio y Nuevos Conceptos para Células Solares
  • Departamento: Tecnologías Especiales Aplicadas a la Telecomunicación
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)