Confirmation of the pyroelectric coefficient of strained InxGa1xAs/GaAs quantum well structures grown on (111)B GaAs by differential photocurrent spectroscopy
J. Appl. Phys. 91, 3002 (2002); doi:10.1063/1.1445278
Issue Date: 1 March 2002
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In this work we used the differential photocurrent technique to measure the strain-induced piezoelectric field in pseudomorphic InxGa1xAs/GaAs heterostructures grown by molecular beam epitaxy on (111)B GaAs substrates. Single and multiple quantum well pin diodes with two different In fractions in the well were analyzed in the temperature range of 25300 K. Our results for a sample with a 17% In fraction confirm the previously reported value of the pyroelectric coefficient for a similar sample obtained by photoreflectance spectroscopy, hence, the equivalence of the differential photocurrent and photoreflectance techniques is also demonstrated. For a sample with 21% In, we report experimental determination of the temperature dependence of the piezoelectric constant and, therefore, of the strain-induced component of the pyroelectric coefficient. ©2002 American Institute of Physics.
| History: | Received 11 September 2001; accepted 28 November 2001 |
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http://link.aip.org/link/?JAPIAU/91/3002/1 |
KEYWORDS and PACS
indium compounds,
gallium arsenide,
III-V semiconductors,
semiconductor quantum wells,
p-i-n diodes,
pyroelectricity,
piezoelectric semiconductors,
photoconductivity,
molecular beam epitaxial growth
- 77.70.+a
Dielectrics, piezoelectrics, and ferroelectrics and their properties Pyroelectric and electrocaloric effects - 73.63.Hs
Electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures Electronic transport in mesoscopic or nanoscale materials and structures Quantum wells - 77.65.Ly
Dielectrics, piezoelectrics, and ferroelectrics and their properties Piezoelectricity and electromechanical effects Strain-induced piezoelectric fields - 73.50.Pz
Electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures Electronic transport phenomena in thin films Photoconduction and photovoltaic effects - 77.65.Bn
Dielectrics, piezoelectrics, and ferroelectrics and their properties Piezoelectricity and electromechanical effects Piezoelectric and electrostrictive constants - 81.15.Hi
Materials science Methods of deposition of films and coatings; film growth and epitaxy Molecular, atomic, ion, and chemical beam epitaxy - YEAR: 2002
RELATED DATABASES
PUBLICATION DATA
0021-8979 (print)
1089-7550 (online)
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