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Title: Pulsed laser deposition of Mn doped CdSe quantum dots for improved solar cell performance

In this work, we demonstrate (1) a facile method to prepare Mn doped CdSe quantum dots (QDs) on Zn{sub 2}SnO{sub 4} photoanodes by pulsed laser deposition and (2) improved device performance of quantum dot sensitized solar cells of the Mn doped QDs (CdSe:Mn) compared to the undoped QDs (CdSe). The band diagram of photoanode Zn{sub 2}SnO{sub 4} and sensitizer CdSe:Mn QD is proposed based on the incident-photon-to-electron conversion efficiency (IPCE) data. Mn-modified band structure leads to absorption at longer wavelengths than the undoped CdSe QDs, which is due to the exchange splitting of the CdSe:Mn conduction band by the Mn dopant. Three-fold increase in the IPCE efficiency has also been observed for the Mn doped samples.
Authors:
; ;  [1] ;  [2]
  1. Department of Physics and Astronomy, University of Wyoming, Laramie, Wyoming 82071 (United States)
  2. Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071 (United States)
Publication Date:
OSTI Identifier:
22269208
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CADMIUM SELENIDES; DOPED MATERIALS; ELECTRONIC STRUCTURE; ENERGY BEAM DEPOSITION; LASER RADIATION; PULSED IRRADIATION; QUANTUM DOTS; SOLAR CELLS