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Reduction of the Optical Absorption of Zinc Germanium Phosphide Via Post-Growth Thermal Anneal

Published online by Cambridge University Press:  10 February 2011

How-Ghee Ang ,
Leng-Leng Chng ,
Yiew-Wang Lee ,
Colin J. Flynn ,
Phil C. Smith  and
Anthony W. Vere
How-Ghee Ang
Affiliation:
DSO National Laboratories, 20 Science Park Drive, Singapore118230
Leng-Leng Chng
Affiliation:
DSO National Laboratories, 20 Science Park Drive, Singapore118230
Yiew-Wang Lee
Affiliation:
DSO National Laboratories, 20 Science Park Drive, Singapore118230
Colin J. Flynn
Affiliation:
Defence Evaluation and Research Agency, Malvern, Worcs, WR14 3PS, United Kingdom
Phil C. Smith
Affiliation:
Defence Evaluation and Research Agency, Malvern, Worcs, WR14 3PS, United Kingdom
Anthony W. Vere
Affiliation:
Defence Evaluation and Research Agency, Malvern, Worcs, WR14 3PS, United Kingdom
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Abstract

This paper describes the reduction of the near-band-edge absorption of zinc germanium phosphide (ZGP) through thermal annealing. The effects of the annealing time, temperature and vapour atmosphere on the reduction of the optical absorption in the near infrared (NIR) region are reported. Results have shown that the optical absorption at 2µm is reduced by at least 50% upon thermal anneal of ZGP. The optimal annealing temperature was 600'C and the optimal annealing time ranged from 200 - 400 h. Annealing in vacuum yielded a larger reduction in the 2-µm optical absorption compared to annealing in the presence of additional zinc and phosphorus vapours. Re-annealing ZGP further reduced the absorption coefficient at 2-µm. However, the percentage decrease in the 2-µm absorption coefficient was much smaller compared to the first thermal anneal.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 607: Symposium OO – Infrared Applications of Semiconductors III , 1999 , 433
Copyright
Copyright © Materials Research Society 2000

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