Research output: Contribution to journal › Article › peer-review
On the nature of the effect of adsorbed oxygen on the excitonic photoluminescence of ZnO. / Lisachenko, A.A.; Titov, V.V.; Akopyan, I.K.; Labzowskaya, M.E.; Novikov, B.V.
In: Journal of Luminescence, Vol. 195, 03.2018, p. 153-158.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - On the nature of the effect of adsorbed oxygen on the excitonic photoluminescence of ZnO
AU - Lisachenko, A.A.
AU - Titov, V.V.
AU - Akopyan, I.K.
AU - Labzowskaya, M.E.
AU - Novikov, B.V.
PY - 2018/3
Y1 - 2018/3
N2 - The mechanism of the effect of adsorbed oxygen on photoluminescence (PL) of ZnO powders and ZnO/Si ALD films in the UV–VIS regions was studied, simultaneously with the in-situ UV photoelectron spectroscopy (UPS) and mass spectrometry (MS) measurements. We have found a drastic (up to 10 times) increase of the exciton PL along with a slight (by ~ 1.5 times) increase of green PL induced by thermo-reducing of ZnO surface in H 2 or CO atmosphere or by a UV–VIS photo-reducing in the vacuum. The reaction products H 2O, CO 2 and photo-desorbed O 2 were registered by the MS. According to UPS (8.43 eV), the change in PL is accompanied by a significant change in the surface dipole value δ without shift of the Fermi level E F or of the band bending V S. We believe that the slow surface states interact with the adsorbed oxygen and thus create a surface 2D-quantum well whose internal field destroys the excitons. The internal fast surface states not interacting with the slow ones provide a pinning of the Fermi level and the stability of the band bending value. The adsorbed oxygen also affects the surface defects thus reducing the VIS luminescence of ZnO.
AB - The mechanism of the effect of adsorbed oxygen on photoluminescence (PL) of ZnO powders and ZnO/Si ALD films in the UV–VIS regions was studied, simultaneously with the in-situ UV photoelectron spectroscopy (UPS) and mass spectrometry (MS) measurements. We have found a drastic (up to 10 times) increase of the exciton PL along with a slight (by ~ 1.5 times) increase of green PL induced by thermo-reducing of ZnO surface in H 2 or CO atmosphere or by a UV–VIS photo-reducing in the vacuum. The reaction products H 2O, CO 2 and photo-desorbed O 2 were registered by the MS. According to UPS (8.43 eV), the change in PL is accompanied by a significant change in the surface dipole value δ without shift of the Fermi level E F or of the band bending V S. We believe that the slow surface states interact with the adsorbed oxygen and thus create a surface 2D-quantum well whose internal field destroys the excitons. The internal fast surface states not interacting with the slow ones provide a pinning of the Fermi level and the stability of the band bending value. The adsorbed oxygen also affects the surface defects thus reducing the VIS luminescence of ZnO.
KW - Mass-spectrometry
KW - Oxygen thermo/photo-desorption
KW - Powders and ZnO/Si ALD films
KW - Superficial 2D-quantum well
KW - UV–VIS Photoluminescence
KW - Zinc oxide
KW - DEFECTS
KW - ELECTRON
KW - NANOPARTICLES
KW - FILMS
KW - LUMINESCENCE
KW - SURFACE
KW - EMISSION
KW - ATOMIC LAYER DEPOSITION
KW - UV-VIS Photoluminescence
UR - http://www.scopus.com/inward/record.url?scp=85034759827&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/nature-effect-adsorbed-oxygen-excitonic-photoluminescence-zno
U2 - 10.1016/j.jlumin.2017.11.022
DO - 10.1016/j.jlumin.2017.11.022
M3 - Article
VL - 195
SP - 153
EP - 158
JO - Journal of Luminescence
JF - Journal of Luminescence
SN - 0022-2313
ER -
ID: 11261156