Visible Light Emission from Ordered Nanopatterned InP Surface
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Published:2007-11
Issue:
Volume:31
Page:56-58
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ISSN:1662-8985
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Container-title:Advanced Materials Research
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language:
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Short-container-title:AMR
Author:
Mohanta S.K.1,
Soni R.K.1,
Tripathy S.2,
Chua Soo Jin2
Affiliation:
1. Indian Institute of Technology Delhi
2. Institute of Materials Research and Engineering
Abstract
The InP nanostructures have been fabricated by low-energy Ar+-ion of dose 1 × 1018 cm-2
and energy 50 keV, at normal incidence. The InP nanodot size varies from 50 to 90 nm.
Photoluminescence spectra show blue shifted visible emission band at 1.98 eV, and quenching of
the band edge emission from the nanopatterned surface. The blue-shifted emission band arises due
to size convoluted band-to-band emission form the surface nanodots while the defects formation in
the irradiated surface leads to the quenching of band edge emission. Thermal annealing results in
clustering of the patterned surface and enhancement of the band edge emission accompanied with
absence of visible band. Our results show that the origin of visible emission is from the surface
nanodots and not from the nanocrystallites in the implanted surface region. This is corroborated by
the wavelength dependence of photoluminescence measurement by probing different depth of the
disordered region.
Publisher
Trans Tech Publications, Ltd.
Subject
General Engineering