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Metal site disorder in zinc tin phosphide

Published online by Cambridge University Press:  31 January 2011

M. A. Ryan
Affiliation:
Department of Chemistry, Mount Holyoke College, South Hadley. Massachusetts 01075
Mark W. Peterson
Affiliation:
Photoconversion Branch, Solar Energy Research Institute, 1607 Cole Boulevard, Golden, Colorado 80401
D. L. Williamson
Affiliation:
Department of Physics, Colorado School of Mines, Golden, Colorado 80401
James S. Frey
Affiliation:
Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
Gary E. Maciel
Affiliation:
Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
B. A. Parkinson*
Affiliation:
E. I. du Pont de Nemours and Co., Central Research and Development Department, Experimental Station E328/216, Wilmington, Delaware 19898
*
a)Author to whom correspondence should be addressed.
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Abstract

The optoelectronic properties of the II-IV-V2 semiconductor ZnSnP2 are studied as a function of the cooling rate of the crystal growth melt. The structure of the material, as studied by x-ray diffraction, is seen to change from chalcopyrite to sphalerite as the cooling rate is increased. Photoelectrochemical measurements show that the bandgap of the material decreases from 1.64 eV for the chalcopyrite to 1.25 eV as the structure approaches sphalerite. The 119Sn Mössbauer spectroscopy shows both an isomer shift and a broadening of the 119Sn resonance as a result of new tin environments produced by disordering of zinc and tin sites at the faster cooling rates. The 31P solid-state nuclear magnetic resonance spectroscopy clearly shows new resonances associated with the additional phosphorus environments produced by metal site disordering. A model based on zinc and tin site exchange with the introduction of compensating donor and acceptor states is proposed and discussed.

Type
Articles
Copyright
Copyright © Materials Research Society 1987

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References

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