The effect of band offsets in quantum dots

Panchak, Aleksandr and Luque López, Antonio and Vlasov, Alexey and Andreev, Viacheslav M. and Martí Vega, Antonio (2016). The effect of band offsets in quantum dots. "Solar Energy Materials And Solar Cells", v. 145 ; pp. 180-184. ISSN 0927-0248. https://doi.org/10.1016/j.solmat.2015.09.051.

Description

Title: The effect of band offsets in quantum dots
Author/s:
  • Panchak, Aleksandr
  • Luque López, Antonio
  • Vlasov, Alexey
  • Andreev, Viacheslav M.
  • Martí Vega, Antonio
Item Type: Article
Título de Revista/Publicación: Solar Energy Materials And Solar Cells
Date: 1 February 2016
ISSN: 0927-0248
Volume: 145
Subjects:
Freetext Keywords: Quantum dot Intermediateband, Potentialoffsets
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The insertion of quantum dots in a host material produces band offsets which are greatly dependent on the field of strains brought about by this insertion. Based on the Empiric KP Hamiltonian model, the energy spectrum of the quantum dot/host system is easily calculated and a relationship between the conduction and valence band offsets is determined by the energy at which the lowest peak of the sub-bandgap quantum efficiency of an intermediate band solar cell is situated; therefore knowledge of the valence band offset leads to knowledge of both offsets. The calculated sub-bandgap quantum efficiency due to the quantum dot is rather insensitive to the value of the valence band offset. However, the calculated quantum efficiency of the wetting layer, modeled as a quantum well, is sensitive to the valence band offset and a fitting with the measured value is possible resulting in a determination of both offsets in the finished solar cell with its final field of strains. The method is applied to an intermediate-band solar cell prototype made with InAs quantum dots in GaAs.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainENE2012-37804-C02-01PROMESAUnspecifiedAplicación de estructuras cuánticas y otros nuevos conceptos a la mejora de la eficiencia de las células solares

More information

Item ID: 45998
DC Identifier: http://oa.upm.es/45998/
OAI Identifier: oai:oa.upm.es:45998
DOI: 10.1016/j.solmat.2015.09.051
Official URL: http://www.sciencedirect.com/science/article/pii/S0927024815004845
Deposited by: Memoria Investigacion
Deposited on: 27 May 2017 10:28
Last Modified: 20 Mar 2019 17:10
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