Electron energy loss spectroscopy of ZnO nanocrystals with different oxygen vacancy concentrations

被引：35

作者：

Dileep, K. ^{[1
]}

Panchakarla, L. S. ^{[2
]}

Balasubramanian, K. ^{[1
]}

Waghmare, U. V. ^{[3
]}

Datta, R. ^{[1
]}

机构：

[1] Jawaharlal Nehru Ctr Adv Sci Res, Int Ctr Mat Sci, Bangalore 560064, Karnataka, India

[2] Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India

[3] Jawaharlal Nehru Ctr Adv Sci Res, Theoret Sci Unit, Bangalore 560064, Karnataka, India

来源：

JOURNAL OF APPLIED PHYSICS | 2011年 / 109卷 / 06期

关键词：

CHEMICAL-VAPOR-DEPOSITION; CO-DOPED ZNO; ROOM-TEMPERATURE; THIN-FILMS; MAGNETIC SEMICONDUCTORS; POLYCRYSTALLINE ZNO; FERROMAGNETISM; PHOTOLUMINESCENCE; NANOPARTICLES; EMISSION;

D O I：

10.1063/1.3555604

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

ZnO nanocrystals with different oxygen vacancy concentrations were characterized by high-resolution electron energy loss spectroscopy (HREELS). ZnO nanocrystals show a decrease in green emission with increasing annealing temperature in an oxygen environment and which significantly quenches in a sample annealed at 400 degrees C. O K and Zn L(3) pre-edge absorption structures of ZnO nanocrystals were studied by HREELS as a function of annealing temperature. Absorption edge peak broadening and variation in pre-edge absorption edge structure of Zn L(3) were observed in experimental electron energy loss spectroscopy spectra with different oxygen defect concentrations. All electron density functional theory (DFT) based (WIEN2k) calculation of electronic density of states and electron energy loss near edge structure were carried out with different oxygen vacancy concentrations and compared with experimental observations. Appearance of additional peaks in pre-edge electron energy loss structure with increasing oxygen vacancy is shown to be due to the oxygen defect states in the bandgap just below the conduction band. (C) 2011 American Institute of Physics. [doi:10.1063/1.3555604]

引用

页数：7

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