Thumbnail
Access Restriction
Open

Author Basu, T. ♦ Kumar, M. ♦ Som, T. ♦ Nandy, S. ♦ Satpati, B. ♦ Saini, C. P. ♦ Kanjilal, A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ARGON IONS ♦ BEAMS ♦ DOPED MATERIALS ♦ MORPHOLOGY ♦ NANOSTRUCTURES ♦ PEAKS ♦ PHOTOLUMINESCENCE ♦ SUBSTRATES ♦ TEMPERATURE RANGE 0273-0400 K ♦ THICKNESS ♦ THIN FILMS ♦ ZINC OXIDES
Abstract Al-doped ZnO (AZO) thin films of thicknesses 5,10, 15, 20, and 30 nm were deposited on 500 eV argon ion-beam fabricated nanoscale self-organized rippled-Si substrates at room temperature and are compared with similar films deposited on pristine-Si substrates (without ripples). It is observed that morphology of self-organized AZO films is driven by the underlying substrate morphology. For instance, for pristine-Si substrates, a granular morphology evolves for all AZO films. On the other hand, for rippled-Si substrates, morphologies having chain-like arrangement (anisotropic in nature) are observed up to a thickness of 20 nm, while a granular morphology evolves (isotropic in nature) for 30 nm-thick film. Photoluminescence studies reveal that excitonic peaks corresponding to 5–15 nm-thick AZO films, grown on rippled-Si templates, show a blue shift of 8 nm and 3 nm, respectively, whereas the peak shift is negligible for 20-nm thick film (with respect to their pristine counter parts). The observed blue shifts are substantiated by diffuse reflectance study and attributed to quantum confinement effect, associated with the size of the AZO grains and their spatial arrangements driven by the anisotropic morphology of underlying rippled-Si templates. The present findings will be useful for making tunable AZO-based light-emitting devices.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-09-14
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 118
Issue Number 10


Open content in new tab

   Open content in new tab