Record Details

Growth of strained ZnSe layers on GaAs substrates by pulsed laser deposition carried out in an off-axis deposition geometry

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Growth of strained ZnSe layers on GaAs substrates by pulsed laser deposition carried out in an off-axis deposition geometry
 
Creator GANGULI, T
PORWAL, S
SHARMA, T
INGALE, A
KUMAR, S
TIWARI, P
BALAMURUGAN, AK
RAJAGOPALAN, S
TYAGI, AK
CHANDRASEKARAN, KS
ARORA, BM
RUSTAGI, KC
 
Subject molecular-beam-epitaxy
hot-wall epitaxy
heteroepitaxial layers
heterojunctions
interface
transport
pld
thin films
znse
high-resolution x-ray diffraction
 
Description We have deposited thin layers of ZnSe on (001) oriented GaAs substrates by pulsed laser deposition at different incident laser fluence (referred to as normal geometry) and in an off-axis geometry where the plasma plume direction is at an angle of similar to 25 degrees away from the direction of the substrate. The crystalline quality of these layers has been studied by high-resolution X-ray diffraction measurements and Raman scattering. We find that we are in a position to deposit pseudomorphic strained layers of ZnSe on GaAs in the off-axis deposition geometry when the ZnSe layer thickness is less than the critical thickness of ZnSe on GaAs i.e. 150 nm. Secondary ion mass spectroscopy, scanning electron microscopy, photoluminescence and electrical transport measurements have also been carried out in all the ZnSe layers and the results of all the above characterizations have been compared for the normal geometry and the off-axis geometry of deposition. All the results indicate that the ZnSe layers deposited in the off-axis geometry have better crystalline quality and an improved interface as compared to the ones deposited in the normal geometry. We attribute this improvement in the overall quality of the ZnSe layers in the off-axis geometry to the reduction in the average energy of the plume particles that reach the GaAs substrate in the off-axis geometry. (C) 2007
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-11-07T16:12:53Z
2011-12-26T13:01:21Z
2011-12-27T05:44:44Z
2011-11-07T16:12:53Z
2011-12-26T13:01:21Z
2011-12-27T05:44:44Z
2007
 
Type Article
 
Identifier THIN SOLID FILMS, 515(20-21), 7834-7842
0040-6090
http://dx.doi.org/10.1016/j.tsf.2007.04.029
http://dspace.library.iitb.ac.in/xmlui/handle/10054/16584
http://hdl.handle.net/10054/16584
 
Language en