Structure and luminescence characteristics of ZnS nanodot array in porous anodic aluminum oxide

Valeev, R.; Romanov, E.; Beltukov, A.; Mukhgalin, V.; Roslyakov, I.; Eliseev, A.

Авторы: Valeev R., Romanov E., Beltukov A., Mukhgalin V., Roslyakov I., Eliseev A.
Журнал: Physica Status Solidi (C) Current Topics in Solid State Physics
Том: 9
Номер: 6
Год издания: 2012
Первая страница: 1462
Последняя страница: 1465
DOI: 10.1002/pssc.201100677
Аннотация: Here we report an investigation of structure and luminescence characteristics of ZnS nanostructures formed in porous anodic aluminum oxide (AAO). Nanostructures were obtained by physical vapor deposition of ZnS onto porous aluminum oxide templates possessing ordered system of channels. Scanning electron microscopy (SEM) studies reveal a periodic arrangement of nearly identical nanostructures (with diameters of ~ 50 nm and the height of 50±20 nm) in hexagonal close packed network with a spatial periodicity of ~100 nm. According to XRD ZnS nanostructures crystalize in AAO matrix preferably in sphalerite phase with preferred growth of cubic ZnS in (111) structure direction. Contrary ZnS@Al2O3 reference sample grown on smooth Al2O3 substrate contains metal Zn phase, originated from an enhanced adhesion of zinc atoms to the substrate at the initial stage of deposition. Raman spectra of both ZnS in AAO matrix and on smooth Al2O3 indicate the presence of ZnS-LO mode at ~ 345 cm-1 corresponding to cubic ZnS phase. The luminuescence spectrum of zinc sulfide nanostructures in AAO matrix has main components located at 407, 445, 490, 517, 537 and 576 nm ascibed accordingly to luminescence of Al2O3 F+ and F centres, intrinsic luminescence of zinc sulphide and recombination of excitons at the ZnS surface states appearing due to interaction of semiconductor with the matrix material on ZnS/AAO interface. ZnS films grown on smooth Al2O3 does not provides luminescence due to the presence of the metal phase of Zn.
Добавил в систему: Елисеев Андрей Анатольевич

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Structure and luminescence characteristics of ZnS nanodot array in porous anodic aluminum oxideстатья

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