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

Yan, Danhua; Zhang, Wenrui; Cen, Jiajie; Stavitski, Eli; Sadowski, Jerzy T.; Vescovo, Elio; Walter, Andrew; Attenkofer, Klaus; Stacchiola, Darío J.; Liu, Mingzhao

doi:10.1063/1.5001043

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

Journal Article · Mon Dec 04 00:00:00 EST 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5001043· OSTI ID:1425053

^[1]; ^[2]; ^[3]; Stavitski, Eli ^[2]; ^[2]; Vescovo, Elio ^[2]; Walter, Andrew ^[2]; ^[2]; Stacchiola, Darío J. ^[2]; Liu, Mingzhao ^[2]

Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Stony Brook Univ., NY (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1425053

Alternate ID(s):: OSTI ID: 1411282

Report Number(s):: BNL-114871-2017-JAAM

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 23 Vol. 111; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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