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Optical Properties of Nano Crystalline InP in Opal 3-Dimensional Gratings

Published online by Cambridge University Press:  15 February 2011

N. P. Johnson ,
S. G. Romanov ,
V. Butko ,
H. Yates ,
M. E. Pemble  and
C. M. Sotomayor Torres
N. P. Johnson
Affiliation:
Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow, G12 8LT, UK. Email: n.johnson@elec.gla.ac.uk
S. G. Romanov
Affiliation:
A.F. Ioffe Physical Technical Institute, St. Petersburg, 194021, Russia
V. Butko
Affiliation:
A.F. Ioffe Physical Technical Institute, St. Petersburg, 194021, Russia
H. Yates
Affiliation:
Department of Chemistry, University of Salford, Manchester, UK.
M. E. Pemble
Affiliation:
Department of Chemistry, University of Salford, Manchester, UK.
C. M. Sotomayor Torres
Affiliation:
Department of Electronics, University of Wuppertal, Germany
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Abstract

Opal consists of a three dimensional array of silica balls with diameter in the range 150 -350 nm and acts as a 3-D grating. Within the microcrystals (a few hundred microns) of opal there is typically 5% variation in ball diameter arranged in a fee structure. Using a specially modified MOCVD process InP can be grown within the voids between the touching silica balls. These interconnecting voids are approximately 1/5 and 2/5 the silica sphere diameter, Raman spectroscopy confirms the crystallinity of the InP for two samples loaded with 2.5 volume % of InP. The LO phonon is shifted to the red by 10 cm−l from the bulk value of 345 cm−1, while the TO phonon is shifted 22 cm−l to the blue from the bulk value of 303.7 cm−l. This shift is attributed to strain in the nanocry stals.

The half width of the reflectance is dependent upon InP loading with the 2.5 vol.% samples giving 0.19 eV and the lower loaded 0.4 vol. % giving 0.17 eV for samples with the same ball diameter. Photoluminescence emission near 1.7 eV is attributed to confined InP compared with a bulk value of 1.4 eV. The energy of the emission is determined by the combined contribution of the laterally confined InP and its interaction with the opal matrix.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 269
Copyright
Copyright © Materials Research Society 1997

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References

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