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Nucleation of CdTe thin films deposited by close-space sublimation under a nitrogen ambient

Major, J.D. and Proskuryakov, Y.Y. and Durose, K. and Green, S. (2007) Nucleation of CdTe thin films deposited by close-space sublimation under a nitrogen ambient. Thin Solid Films, 515 (15). pp. 5828-5832. ISSN 0040-6090

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Abstract

The early stages of the close-space sublimation growth of CdTe/ITO (indium tin oxide) at 500°C under 26.7 kPa (200 Torr) of N2 were investigated, the relatively high pressure being used to slow the growth. Film development was monitored over 60 mins by ex-situ AFM (atomic force microscopy), the growth being controlled by a shutter. The films formed by the ‘island’ or Volmer–Weber growth mechanism. Developments in the areal island growth rate, the island density and spatial distribution type were explained using growth mechanisms. Significant changes in these phenomena at t ≥ 10 mins were attributed to a change in growth mechanism from surface migration limited, to a regime in which island coalescence and direct impingement of vapour species on the islands became important. Since the islands are characterised by distinct crystalline facets, this indicates the growth mechanism to be uninterrupted step-flow like addition of material to each island. Arguments are given to relate the final grain size in the films to the density of nuclei that are stable to re-evaporation after t = 10 mins.

Item Type: Article
Journal or Publication Title: Thin Solid Films
Additional Information: <ce:title>Proceedings of Sympodium O on Thin Film Chalcogenide Photovoltaic Materials, EMRS 2006 Conference</ce:title> <ce:subtitle>EMRS 2006 Symposium O</ce:subtitle>
Uncontrolled Keywords: CdTe ; Thin film ; Nucleation ; Solar
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Engineering
ID Code: 57855
Deposited By: ep_importer_pure
Deposited On: 16 Oct 2012 16:07
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:32
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/57855

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