Vacancy relaxation in cuprous oxide (Cu2−xO1−y)

Laszlo Frazer; Kelvin B. Chang; Richard D. Schaller; Kenneth R. Poeppelmeier; John B. Ketterson

doi:10.1016/j.jlumin.2016.11.011

Vacancy relaxation in cuprous oxide (Cu_2−xO_1−y)

Laszlo Frazer^*, Kelvin B. Chang, Richard D. Schaller, Kenneth R. Poeppelmeier, John B. Ketterson

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Phonons are produced when an excited vacancy in cuprous oxide (Cu₂O) relaxes. Time resolved luminescence was used to find the excited copper vacancy (acceptor) and oxygen vacancy (donor) trap levels and lifetimes. It was also used to determine the typical energy and number of phonons in the phonon pulses emitted by vacancies. The vacancy properties of cuprous oxide are controlled by several synthesis parameters and by the temperature. We directly demonstrate the absorption of light by oxygen vacancies with transient absorption. Copper and oxygen vacancies behave differently, in part because the two kinds of traps capture carriers from different states. For example, the copper vacancy luminescence lifetime is around 25 times greater at low temperature. However, both kinds of vacancy luminescence are consistent with a Poissonian multiple phonon emission model.

Original language	English (US)
Pages (from-to)	281-290
Number of pages	10
Journal	Journal of Luminescence
Volume	183
DOIs	https://doi.org/10.1016/j.jlumin.2016.11.011
State	Published - Mar 1 2017

Funding

L.F. was supported by NSF IGERT DGE-0801685 and the Institute for Sustainability and Energy at Northwestern (ISEN). Crystal growth was supported by NSF DMR-1307698 and in part by Argonne National Laboratory under U.S. Department of Energy contract DE-AC02-06CH11357 . K.C. was supported as part of the Center for Inverse Design, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under award number DE-AC36-08GO28308 . Use of the Center for Nanoscale Materials was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357 . This work made use of the X-ray and OMM Facilities supported by the MRSEC program of the NSF DMR-1121262 at the MRC of Northwestern.

Keywords

Bound exciton
Cuprous oxide
Exciton
Phonon
Stoichiometry
Vacancy

ASJC Scopus subject areas

Biophysics
Atomic and Molecular Physics, and Optics
General Chemistry
Biochemistry
Condensed Matter Physics

Access to Document

10.1016/j.jlumin.2016.11.011

Cite this

@article{445d8d54e2a74945b585584715b2cd7e,

title = "Vacancy relaxation in cuprous oxide (Cu2−xO1−y)",

abstract = "Phonons are produced when an excited vacancy in cuprous oxide (Cu2O) relaxes. Time resolved luminescence was used to find the excited copper vacancy (acceptor) and oxygen vacancy (donor) trap levels and lifetimes. It was also used to determine the typical energy and number of phonons in the phonon pulses emitted by vacancies. The vacancy properties of cuprous oxide are controlled by several synthesis parameters and by the temperature. We directly demonstrate the absorption of light by oxygen vacancies with transient absorption. Copper and oxygen vacancies behave differently, in part because the two kinds of traps capture carriers from different states. For example, the copper vacancy luminescence lifetime is around 25 times greater at low temperature. However, both kinds of vacancy luminescence are consistent with a Poissonian multiple phonon emission model.",

keywords = "Bound exciton, Cuprous oxide, Exciton, Phonon, Stoichiometry, Vacancy",

author = "Laszlo Frazer and Chang, {Kelvin B.} and Schaller, {Richard D.} and Poeppelmeier, {Kenneth R.} and Ketterson, {John B.}",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2017",

month = mar,

day = "1",

doi = "10.1016/j.jlumin.2016.11.011",

language = "English (US)",

volume = "183",

pages = "281--290",

journal = "Journal of Luminescence",

issn = "0022-2313",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Vacancy relaxation in cuprous oxide (Cu2−xO1−y)

AU - Frazer, Laszlo

AU - Chang, Kelvin B.

AU - Schaller, Richard D.

AU - Poeppelmeier, Kenneth R.

AU - Ketterson, John B.

PY - 2017/3/1

Y1 - 2017/3/1

N2 - Phonons are produced when an excited vacancy in cuprous oxide (Cu2O) relaxes. Time resolved luminescence was used to find the excited copper vacancy (acceptor) and oxygen vacancy (donor) trap levels and lifetimes. It was also used to determine the typical energy and number of phonons in the phonon pulses emitted by vacancies. The vacancy properties of cuprous oxide are controlled by several synthesis parameters and by the temperature. We directly demonstrate the absorption of light by oxygen vacancies with transient absorption. Copper and oxygen vacancies behave differently, in part because the two kinds of traps capture carriers from different states. For example, the copper vacancy luminescence lifetime is around 25 times greater at low temperature. However, both kinds of vacancy luminescence are consistent with a Poissonian multiple phonon emission model.

AB - Phonons are produced when an excited vacancy in cuprous oxide (Cu2O) relaxes. Time resolved luminescence was used to find the excited copper vacancy (acceptor) and oxygen vacancy (donor) trap levels and lifetimes. It was also used to determine the typical energy and number of phonons in the phonon pulses emitted by vacancies. The vacancy properties of cuprous oxide are controlled by several synthesis parameters and by the temperature. We directly demonstrate the absorption of light by oxygen vacancies with transient absorption. Copper and oxygen vacancies behave differently, in part because the two kinds of traps capture carriers from different states. For example, the copper vacancy luminescence lifetime is around 25 times greater at low temperature. However, both kinds of vacancy luminescence are consistent with a Poissonian multiple phonon emission model.

KW - Bound exciton

KW - Cuprous oxide

KW - Exciton

KW - Phonon

KW - Stoichiometry

KW - Vacancy

UR - http://www.scopus.com/inward/record.url?scp=84998980229&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84998980229&partnerID=8YFLogxK

U2 - 10.1016/j.jlumin.2016.11.011

DO - 10.1016/j.jlumin.2016.11.011

M3 - Article

AN - SCOPUS:84998980229

SN - 0022-2313

VL - 183

SP - 281

EP - 290

JO - Journal of Luminescence

JF - Journal of Luminescence

ER -