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Room Temperature Excitonic Absorption in Small Cds Crystallites

Published online by Cambridge University Press:  21 February 2011

D.K. Rai  and
Binod Kumar
D.K. Rai
Affiliation:
University of Dayton Research Institute, Dayton, OH 45469
Binod Kumar
Affiliation:
University of Dayton Research Institute, Dayton, OH 45469
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Abstract

The absorption characteristics of commercial CdS-containing yellow glass which shows constant transmitted intensity over a range of incident CW laser intensity have been studied at room temperature. Although the thick specimen (t>0.6 mm) shows only a broad step-like feature near λ>460 nm, a thin (t-0.09 mm) specimen shows two absorption features which can be interpreted as the first two quantum-confined exciton absorption features corresponding to a crystallite size of -45 Å. The absorption spectrum of a sample (t∼O.6 mm) heated for 15 min. at 700°C shows two new absorption features at 450 nm and 380 nm, which correspond to a much smaller crystallite size of -25 Å. This reduction in size is not inconsistent with estimates made from a well-known model for crystallite growth. Some consequences of these changes in the absorption features on the optical nonlinearities of the glass will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 164: Symposium H – Materials Issues in Microcrystalline Semiconductors , 1989 , 135
Copyright
Copyright © Materials Research Society 1990

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