The role of surface and deep-level defects on the emission of tin oxide quantum dots

Vinod Kumar; Vijay Kumar; S. Som; J. H. Neethling; Ezra Olivier; O. M. Ntwaeaborwa; H. C. Swart

doi:10.1088/0957-4484/25/13/135701

The role of surface and deep-level defects on the emission of tin oxide quantum dots

Vinod Kumar, Vijay Kumar, S. Som, J. H. Neethling, Ezra Olivier, O. M. Ntwaeaborwa, H. C. Swart

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

124 Citations (Scopus)

Abstract

This paper reports on the role of surface and deep-level defects on the blue emission of tin oxide quantum dots (SnO₂QDs) synthesized by the solution-combustion method at different combustion temperatures. X-ray diffraction studies showed the formation of a single rutile SnO₂ phase with a tetragonal lattice structure. High resolution transmission electron microscopy studies revealed an increase in the average dot size from 2.2 to 3.6 nm with an increase of the combustion temperature from 350 to 550 °C. A decrease in the band gap value from 3.37 to 2.76 eV was observed with the increase in dot size due to the quantum confinement effect. The photoluminescence emission was measured for excitation at 325 nm and it showed a broad blue emission band for all the combustion temperatures studied. This was due to the creation of various oxygen and tin vacancies/defects as confirmed by x-ray photoelectron spectroscopy data. The origin of the blue emission in the SnO₂ QDs is discussed with the help of an energy band diagram.

Original language	English
Article number	135701
Journal	Nanotechnology
Volume	25
Issue number	13
DOIs	https://doi.org/10.1088/0957-4484/25/13/135701
Publication status	Published - 4 Apr 2014
Externally published	Yes

Keywords

blue emission
surface defect and deeplevel defect

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

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10.1088/0957-4484/25/13/135701

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title = "The role of surface and deep-level defects on the emission of tin oxide quantum dots",

abstract = "This paper reports on the role of surface and deep-level defects on the blue emission of tin oxide quantum dots (SnO2QDs) synthesized by the solution-combustion method at different combustion temperatures. X-ray diffraction studies showed the formation of a single rutile SnO2 phase with a tetragonal lattice structure. High resolution transmission electron microscopy studies revealed an increase in the average dot size from 2.2 to 3.6 nm with an increase of the combustion temperature from 350 to 550 °C. A decrease in the band gap value from 3.37 to 2.76 eV was observed with the increase in dot size due to the quantum confinement effect. The photoluminescence emission was measured for excitation at 325 nm and it showed a broad blue emission band for all the combustion temperatures studied. This was due to the creation of various oxygen and tin vacancies/defects as confirmed by x-ray photoelectron spectroscopy data. The origin of the blue emission in the SnO2 QDs is discussed with the help of an energy band diagram.",

keywords = "blue emission, surface defect and deeplevel defect",

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AU - Kumar, Vinod

AU - Kumar, Vijay

AU - Som, S.

AU - Neethling, J. H.

AU - Olivier, Ezra

AU - Ntwaeaborwa, O. M.

AU - Swart, H. C.

PY - 2014/4/4

Y1 - 2014/4/4

N2 - This paper reports on the role of surface and deep-level defects on the blue emission of tin oxide quantum dots (SnO2QDs) synthesized by the solution-combustion method at different combustion temperatures. X-ray diffraction studies showed the formation of a single rutile SnO2 phase with a tetragonal lattice structure. High resolution transmission electron microscopy studies revealed an increase in the average dot size from 2.2 to 3.6 nm with an increase of the combustion temperature from 350 to 550 °C. A decrease in the band gap value from 3.37 to 2.76 eV was observed with the increase in dot size due to the quantum confinement effect. The photoluminescence emission was measured for excitation at 325 nm and it showed a broad blue emission band for all the combustion temperatures studied. This was due to the creation of various oxygen and tin vacancies/defects as confirmed by x-ray photoelectron spectroscopy data. The origin of the blue emission in the SnO2 QDs is discussed with the help of an energy band diagram.

AB - This paper reports on the role of surface and deep-level defects on the blue emission of tin oxide quantum dots (SnO2QDs) synthesized by the solution-combustion method at different combustion temperatures. X-ray diffraction studies showed the formation of a single rutile SnO2 phase with a tetragonal lattice structure. High resolution transmission electron microscopy studies revealed an increase in the average dot size from 2.2 to 3.6 nm with an increase of the combustion temperature from 350 to 550 °C. A decrease in the band gap value from 3.37 to 2.76 eV was observed with the increase in dot size due to the quantum confinement effect. The photoluminescence emission was measured for excitation at 325 nm and it showed a broad blue emission band for all the combustion temperatures studied. This was due to the creation of various oxygen and tin vacancies/defects as confirmed by x-ray photoelectron spectroscopy data. The origin of the blue emission in the SnO2 QDs is discussed with the help of an energy band diagram.

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The role of surface and deep-level defects on the emission of tin oxide quantum dots

Abstract

Keywords

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