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A Study of the Pressure-Induced Phase Transition in Bulk and Nanocrystalline Cadmium Sulfide

Published online by Cambridge University Press:  21 February 2011

Xue-Shu Zhao ,
John Schroeder ,
Peter D. Persans  and
Enlian Lu
Xue-Shu Zhao
Affiliation:
Department of Physics, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
John Schroeder
Affiliation:
Department of Physics, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
Peter D. Persans
Affiliation:
Department of Physics, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
Enlian Lu
Affiliation:
Department of Physics, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
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Abstract

We have used Resonant Raman scattering induced by pressure tuning to study the phase transition and electronic states of bulk and 60±20 Å colloidal microcrystallite CdS. The experimental results show that bulk CdS undergoes a well-defined first order phase transition at 27 kbar and that the intensity of the Raman scattering increases sharply when the level of the intermediate state (bound exciton I2) is close to the photon energy. After the phase transition no Raman scattering and photoluminescence can be observed. However, the phase transition in the colloidal CdS is quite different from the bulk CdS and the complete phase transition occurs above 60 kbar. Both bulk and colloidal CdS reverse to the original wurtzite phase after releasing the pressure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 164: Symposium H – Materials Issues in Microcrystalline Semiconductors , 1989 , 93
Copyright
Copyright © Materials Research Society 1990

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