Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Advances in quantum dot intermediate band solar cells
Year:2010
Research Areas
  • Physics - Semiconductors and band structure
Information
Abstract
Several groups have reported on intermediate band solar cells (IBSC) fabricated with InAs/GaAs quantum dots (QD) which exhibit quantum efficiencies (QE) for sub-bandgap photon energies. However, this QE is produced by the absorption of photons only through valence band (VB) to intermediate band (IB) transitions. The absorption of photons of that energy in IB to conduction band (CB) transitions is weak and is usually replaced by carrier escape. This mechanism is incompatible with the preservation of the output voltage, and therefore, it cannot lead to the high efficiencies predicted by the IBSC model. In this work, we discuss the contribution of thermal and tunneling mechanisms to IB-CB carrier escape in current QD-IBSCs. It is experimentally demonstrated that in QDIBSC prototypes where tunnel escape has been eliminated, the sub-bandgap QE is suppressed at sufficiently low temperatures, and when this occurs, the only limit for the open-circuit voltage (VOC) is the fundamental semiconductor bandgap, as stated by the IBSC theoretical model
International
Si
Congress
35th IEEE Photovoltaic Specialists Conference
960
Place
Hawaii, Honolulu (EEUU)
Reviewers
Si
ISBN/ISSN
978-1-4244-5891-2
Start Date
20/06/2010
End Date
25/06/2010
From page
65
To page
70
Proc. 35th IEEE Photovoltaic Specialists Conference
Participants
  • Autor: Elisa Antolin Fernandez (UPM)
  • Autor: Antonio Marti Vega (UPM)
  • Autor: Pablo Garcia-Linares Fontes (UPM)
  • Autor: Iñigo Ramiro Gonzalez (UPM)
  • Autor: Estela Hernandez Martin (UPM)
  • Autor: Antonio Luque Lopez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Silicio y Nuevos Conceptos para Células Solares
  • Centro o Instituto I+D+i: Instituto de Energía Solar
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)
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