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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5001043· OSTI ID:1425053
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)
+ Show Author Affiliations

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.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC00122704
OSTI ID:
1425053
Alternate ID(s):
OSTI ID: 1411282
Report Number(s):
BNL-114871-2017-JAAM; TRN: US1802019
Journal Information:
Applied Physics Letters, Vol. 111, Issue 23; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

References (31)

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Cited By (1)

High-performance organic/inorganic hybrid ultraviolet p-NiO/PVK/n-ZnO heterojunction photodiodes with a poly( N -vinylcarbazole) insertion layer journal January 2019

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