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Title: Near band edge photoluminescence of ZnO nanowires: Optimization via surface engineering

Zinc oxide (ZnO) nanowire arrays have potential applications for various devices including ultra-violet light emitting diodes and lasers, where photoluminescence of intense near band edge emission without defect emissions is usually desired. Here, we demonstrate, counter-intuitively, that the near band edge emission may become dominant by introducing certain surface defects to ZnO nanowires via surface engineering. Specifically, near band edge emission (NBE) is effectively enhanced after a low pressure O 2 plasma treatment that sputters off surface oxygen species to produce a reduced and oxygen vacancy-rich surface. The effect is attributed to the lowered surface valence band maximum of the reduced ZnO surface that creates an accumulative band bending, which screens the photo-generated minority carriers (holes) from reaching or being trapped by the surface defects.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ;  [2] ; ORCiD logo [2] ;  [2] ;  [2] ; ORCiD logo [2] ;  [2] ;  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Stony Brook Univ., NY (United States)
Publication Date:
Report Number(s):
BNL-114871-2017-JAAM
Journal ID: ISSN 0003-6951; TRN: US1802019
Grant/Contract Number:
SC0012704; SC00122704
Type:
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)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1425053
Alternate Identifier(s):
OSTI ID: 1411282

Yan, Danhua, Zhang, Wenrui, Cen, Jiajie, Stavitski, Eli, Sadowski, Jerzy T., Vescovo, Elio, Walter, Andrew, Attenkofer, Klaus, Stacchiola, Darío J., and Liu, Mingzhao. Near band edge photoluminescence of ZnO nanowires: Optimization via surface engineering. United States: N. p., Web. doi:10.1063/1.5001043.
Yan, Danhua, Zhang, Wenrui, Cen, Jiajie, Stavitski, Eli, Sadowski, Jerzy T., Vescovo, Elio, Walter, Andrew, Attenkofer, Klaus, Stacchiola, Darío J., & Liu, Mingzhao. Near band edge photoluminescence of ZnO nanowires: Optimization via surface engineering. United States. doi:10.1063/1.5001043.
Yan, Danhua, Zhang, Wenrui, Cen, Jiajie, Stavitski, Eli, Sadowski, Jerzy T., Vescovo, Elio, Walter, Andrew, Attenkofer, Klaus, Stacchiola, Darío J., and Liu, Mingzhao. 2017. "Near band edge photoluminescence of ZnO nanowires: Optimization via surface engineering". United States. doi:10.1063/1.5001043.
@article{osti_1425053,
title = {Near band edge photoluminescence of ZnO nanowires: Optimization via surface engineering},
author = {Yan, Danhua and Zhang, Wenrui and Cen, Jiajie and Stavitski, Eli and Sadowski, Jerzy T. and Vescovo, Elio and Walter, Andrew and Attenkofer, Klaus and Stacchiola, Darío J. and Liu, Mingzhao},
abstractNote = {Zinc oxide (ZnO) nanowire arrays have potential applications for various devices including ultra-violet light emitting diodes and lasers, where photoluminescence of intense near band edge emission without defect emissions is usually desired. Here, we demonstrate, counter-intuitively, that the near band edge emission may become dominant by introducing certain surface defects to ZnO nanowires via surface engineering. Specifically, near band edge emission (NBE) is effectively enhanced after a low pressure O2 plasma treatment that sputters off surface oxygen species to produce a reduced and oxygen vacancy-rich surface. The effect is attributed to the lowered surface valence band maximum of the reduced ZnO surface that creates an accumulative band bending, which screens the photo-generated minority carriers (holes) from reaching or being trapped by the surface defects.},
doi = {10.1063/1.5001043},
journal = {Applied Physics Letters},
number = 23,
volume = 111,
place = {United States},
year = {2017},
month = {12}
}