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Title: Effects of Mn dopant locations on the electronic bandgap of PbS quantum dots

Abstract

Dilute magnetic semiconductors (DMSs) are typically made by doping semiconductors with magnetic transition metal elements. Compared to the well-understood bulk and thin film DMS, the understanding of the magnetic element doping effects in semiconducting quantum dots (QDs) is relatively poor. In particular, the influence of the dopant locations is rarely explored. Here, we present a comprehensive study of the effects of Mn doping on the electronic density of states of PbS QDs. Based on the results observed by scanning tunneling microscopy, X-ray diffraction, electron paramagnetic resonance, and density functional theory calculations, it is found that the Mn doping causes a broadening of the electronic bandgap in the PbS QDs. The sp-d hybridization between the PbS host material and Mn dopants is argued to be responsible for the bandgap broadening. Moreover, the locations of the Mn dopants, i.e., on the surface or inside the QDs, have been found to play an important role in the strength of the sp-d hybridization, which manifests as different degrees of the bandgap change.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Univ. of Wyoming, Laramie, WY (United States)
Publication Date:
Research Org.:
Univ. of Wyoming, Laramie, WY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1505560
Alternate Identifier(s):
OSTI ID: 1411115
Grant/Contract Number:  
SC0004981; DEFG02-10ER46728
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 23; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Yost, Andrew J., Pimachev, Artem, Rimal, Gaurab, Tang, Jinke, Dahnovsky, Yuri, and Chien, TeYu. Effects of Mn dopant locations on the electronic bandgap of PbS quantum dots. United States: N. p., 2017. Web. doi:10.1063/1.5004463.
Yost, Andrew J., Pimachev, Artem, Rimal, Gaurab, Tang, Jinke, Dahnovsky, Yuri, & Chien, TeYu. Effects of Mn dopant locations on the electronic bandgap of PbS quantum dots. United States. doi:10.1063/1.5004463.
Yost, Andrew J., Pimachev, Artem, Rimal, Gaurab, Tang, Jinke, Dahnovsky, Yuri, and Chien, TeYu. Mon . "Effects of Mn dopant locations on the electronic bandgap of PbS quantum dots". United States. doi:10.1063/1.5004463. https://www.osti.gov/servlets/purl/1505560.
@article{osti_1505560,
title = {Effects of Mn dopant locations on the electronic bandgap of PbS quantum dots},
author = {Yost, Andrew J. and Pimachev, Artem and Rimal, Gaurab and Tang, Jinke and Dahnovsky, Yuri and Chien, TeYu},
abstractNote = {Dilute magnetic semiconductors (DMSs) are typically made by doping semiconductors with magnetic transition metal elements. Compared to the well-understood bulk and thin film DMS, the understanding of the magnetic element doping effects in semiconducting quantum dots (QDs) is relatively poor. In particular, the influence of the dopant locations is rarely explored. Here, we present a comprehensive study of the effects of Mn doping on the electronic density of states of PbS QDs. Based on the results observed by scanning tunneling microscopy, X-ray diffraction, electron paramagnetic resonance, and density functional theory calculations, it is found that the Mn doping causes a broadening of the electronic bandgap in the PbS QDs. The sp-d hybridization between the PbS host material and Mn dopants is argued to be responsible for the bandgap broadening. Moreover, the locations of the Mn dopants, i.e., on the surface or inside the QDs, have been found to play an important role in the strength of the sp-d hybridization, which manifests as different degrees of the bandgap change.},
doi = {10.1063/1.5004463},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 23,
volume = 111,
place = {United States},
year = {2017},
month = {12}
}

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Works referenced in this record:

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