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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S1 — Jan. 13, 2014
  • pp: A80–A89

Photovoltaic effect in multiphase Bi-Mn-O thin films

J. P. Chakrabartty, R. Nechache, C. Harnagea, and F. Rosei  »View Author Affiliations

Optics Express, Vol. 22, Issue S1, pp. A80-A89 (2014)

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We report an external solar power conversion efficiency of ~0.1% in Bi-Mn-O thin films grown onto (111) oriented Niobium doped SrTiO3 (STO) single crystal substrate by pulse laser deposition (PLD). The films contain BiMnO3 (BMO) and Mn3O4 (MO) phases, which both grow epitaxially. The growth conditions were tailored to obtain films with different Bi/Mn ratios. The films were subsequently illuminated under a sun simulator (AM 1.5 G). We find that the Bi/Mn ratio in the film affects the magnitude of the photo induced voltage and photocurrent and therefore the photovoltaic conversion efficiency. Specifically, a higher Bi/Mn ratio (towards unity) in the film increases the power conversion efficiency. This effect is described in terms of a more favorable energy band alignment of the film/substrate hetero-structure junction, which controls photo carrier separation.

© 2013 Optical Society of America

OCIS Codes
(040.5350) Detectors : Photovoltaic
(160.2260) Materials : Ferroelectrics
(240.0310) Optics at surfaces : Thin films
(310.5448) Thin films : Polarization, other optical properties
(310.6845) Thin films : Thin film devices and applications

ToC Category:

Original Manuscript: August 2, 2013
Revised Manuscript: November 25, 2013
Manuscript Accepted: November 25, 2013
Published: December 5, 2013

J. P. Chakrabartty, R. Nechache, C. Harnagea, and F. Rosei, "Photovoltaic effect in multiphase Bi-Mn-O thin films," Opt. Express 22, A80-A89 (2014)

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