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Title: Controlled synthesis of Eu{sup 2+} and Eu{sup 3+} doped ZnS quantum dots and their photovoltaic and magnetic properties

Abstract

Eu-doped ZnS quantum dots (QDs) have been synthesized by wet-chemical method and found to form in zinc blende (cubic) structure. Both Eu{sup 2+} and Eu{sup 3+} doped ZnS can be controllably synthesized. The Eu{sup 2+} doped ZnS QDs show broad photoluminescence emission peak around 512 nm, which is from the Eu{sup 2+} intra-ion transition of 4f{sup 6}d{sup 1} – 4f{sup 7}, while the Eu{sup 3+} doped samples exhibit narrow emission lines characteristic of transitions between the 4f levels. The investigation of the magnetic properties shows that the Eu{sup 3+} doped samples exhibit signs of ferromagnetism, on the other hand, Eu{sup 2+} doped samples are paramagnetic of Curie-Weiss type. The incident photon to electron conversion efficiency is increased with the Eu doping, which suggests the QD solar cell efficiency can be enhanced by Eu doping due to widened absorption windows. This is an attractive approach to utilize benign and environmentally friendly wide band gap ZnS QDs in solar cell technology.

Authors:
; ; ;  [1]; ;  [2]
  1. Department of Physics and Astronomy, University of Wyoming, Laramie, Wyoming 82071 (United States)
  2. Department of Electrical Engineering, University of Wyoming, Laramie, Wyoming 82071 (United States)
Publication Date:
OSTI Identifier:
22611662
Resource Type:
Journal Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 4; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2158-3226
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; CONVERSION; DOPED MATERIALS; EFFICIENCY; EUROPIUM ADDITIONS; FERROMAGNETISM; MAGNETIC PROPERTIES; PARAMAGNETISM; PHOTOLUMINESCENCE; PHOTONS; PHOTOVOLTAIC EFFECT; QUANTUM DOTS; SOLAR CELLS; SYNTHESIS; ZINC SULFIDES

Citation Formats

Horoz, Sabit, Poudyal, Uma, Wang, Wenyong, Tang, Jinke, E-mail: jtang2@uwyo.edu, Yakami, Baichhabi, and Pikal, Jon M. Controlled synthesis of Eu{sup 2+} and Eu{sup 3+} doped ZnS quantum dots and their photovoltaic and magnetic properties. United States: N. p., 2016. Web. doi:10.1063/1.4948510.
Horoz, Sabit, Poudyal, Uma, Wang, Wenyong, Tang, Jinke, E-mail: jtang2@uwyo.edu, Yakami, Baichhabi, & Pikal, Jon M. Controlled synthesis of Eu{sup 2+} and Eu{sup 3+} doped ZnS quantum dots and their photovoltaic and magnetic properties. United States. doi:10.1063/1.4948510.
Horoz, Sabit, Poudyal, Uma, Wang, Wenyong, Tang, Jinke, E-mail: jtang2@uwyo.edu, Yakami, Baichhabi, and Pikal, Jon M. Fri . "Controlled synthesis of Eu{sup 2+} and Eu{sup 3+} doped ZnS quantum dots and their photovoltaic and magnetic properties". United States. doi:10.1063/1.4948510.
@article{osti_22611662,
title = {Controlled synthesis of Eu{sup 2+} and Eu{sup 3+} doped ZnS quantum dots and their photovoltaic and magnetic properties},
author = {Horoz, Sabit and Poudyal, Uma and Wang, Wenyong and Tang, Jinke, E-mail: jtang2@uwyo.edu and Yakami, Baichhabi and Pikal, Jon M.},
abstractNote = {Eu-doped ZnS quantum dots (QDs) have been synthesized by wet-chemical method and found to form in zinc blende (cubic) structure. Both Eu{sup 2+} and Eu{sup 3+} doped ZnS can be controllably synthesized. The Eu{sup 2+} doped ZnS QDs show broad photoluminescence emission peak around 512 nm, which is from the Eu{sup 2+} intra-ion transition of 4f{sup 6}d{sup 1} – 4f{sup 7}, while the Eu{sup 3+} doped samples exhibit narrow emission lines characteristic of transitions between the 4f levels. The investigation of the magnetic properties shows that the Eu{sup 3+} doped samples exhibit signs of ferromagnetism, on the other hand, Eu{sup 2+} doped samples are paramagnetic of Curie-Weiss type. The incident photon to electron conversion efficiency is increased with the Eu doping, which suggests the QD solar cell efficiency can be enhanced by Eu doping due to widened absorption windows. This is an attractive approach to utilize benign and environmentally friendly wide band gap ZnS QDs in solar cell technology.},
doi = {10.1063/1.4948510},
journal = {AIP Advances},
issn = {2158-3226},
number = 4,
volume = 6,
place = {United States},
year = {2016},
month = {4}
}