V-substituted In2S3: an intermediate band material with photocatalytic activity in the whole visible light range

Lucena, Raquel and Conesa, Jose Carlos and Aguilera Bonet, Irene and Palacios Clemente, Pablo and Wahnón Benarroch, Perla (2014). V-substituted In2S3: an intermediate band material with photocatalytic activity in the whole visible light range. "Journal Of Materials Chemistry A" (n. 22); pp. 8236-8245. ISSN 2050-7488. https://doi.org/10.1039/C4TA00513A.

Description

Title: V-substituted In2S3: an intermediate band material with photocatalytic activity in the whole visible light range
Author/s:
  • Lucena, Raquel
  • Conesa, Jose Carlos
  • Aguilera Bonet, Irene
  • Palacios Clemente, Pablo
  • Wahnón Benarroch, Perla
Item Type: Article
Título de Revista/Publicación: Journal Of Materials Chemistry A
Date: June 2014
ISSN: 2050-7488
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

We proposed in our previous work V-substituted In2S3 as an intermediate band (IB) material able to enhance the efficiency of photovoltaic cells by combining two photons to achieve a higher energy electron excitation, much like natural photosynthesis. Here this hyper-doped material is tested in a photocatalytic reaction using wavelength-controlled light. The results evidence its ability to use photons with wavelengths of up to 750 nm, i.e. with energy significantly lower than the bandgap (=2.0 eV) of non-substituted In2S3, driving with them the photocatalytic reaction at rates comparable to those of non-substituted In2S3 in its photoactivity range (λ ≤ 650 nm). Photoluminescence spectra evidence that the same bandgap excitation as in V-free In2S3 occurs in V-substituted In2S3 upon illumination with photons in the same sub-bandgap energy range which is effective in photocatalysis, and its linear dependence on light intensity proves that this is not due to a nonlinear optical property. This evidences for the first time that a two-photon process can be active in photocatalysis in a single-phase material. Quantum calculations using GW-type many-body perturbation theory suggest that the new band introduced in the In2S3 gap by V insertion is located closer to the conduction band than to the valence band, so that hot carriers produced by the two-photon process would be of electron type; they also show that the absorption coefficients of both transitions involving the IB are of significant and similar magnitude. The results imply that V-substituted In2S3, besides being photocatalytically active in the whole visible light range (a property which could be used for the production of solar fuels), could make possible photovoltaic cells of improved efficiency.

Funding Projects

TypeCodeAcronymLeaderTitle
Madrid Regional GovernmentS2009/ENE-1477UnspecifiedUnspecifiedUnspecified

More information

Item ID: 37394
DC Identifier: http://oa.upm.es/37394/
OAI Identifier: oai:oa.upm.es:37394
DOI: 10.1039/C4TA00513A
Official URL: http://pubs.rsc.org/en/Content/ArticleLanding/2014/TA/c4ta00513a#!divAbstract
Deposited by: Memoria Investigacion
Deposited on: 21 Sep 2015 16:55
Last Modified: 21 Sep 2015 16:55
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