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Interface characterization of GaAs/Ge heterostructure grown by metalorganic vapor phase epitaxy

Krupanidhi, SB and Hudait, MK (2000) Interface characterization of GaAs/Ge heterostructure grown by metalorganic vapor phase epitaxy. In: Tenth International Workshop on the Physics of Semiconductor Devices, 14-18 Dec. 1999, New Delhi, India, pp. 171-178.

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GaAs/Ge heterostructures having abrupt interfaces were grown under different growth conditions and investigated by atomic force microscopy (AFM), cross sectional high resolution transmission electron microscopy (HRTEM), low temperature photoluminescence (LTPL) spectroscopy, electrochemical capacitance voltage (ECV) profiling and current/voltage (I/V) characteristics. Our results indicate that a 6° off cut Ge substrate coupled with a growth temperature of ~675° C, growth rate of ~3 μm/hr and a V/III ratio of ~88 is an optimum growth condition for the buffer layer growth of GaAs/Ge heterostructure solar cells. The surface morphology was found to be very good on 6° off oriented Ge substrate and rms roughness was ~30.8 nm over 10 × 10 μm2 area scan over 2° and 9° off oriented Ge substrates. The lattice indexing of HRTEM exhibited an excellent lattice line matching between GaAs and Ge substrates. The ECV profiler shows an excellent abruptness between the film/substrate interface of GaAs/Ge and also between various layers of the complete solar cell structures. Finally, the I/V characteristics of GaAs/Ge solar cells were analysed under AM0 condition

Item Type: Conference Paper
Publisher: SPIE - The International Society for Optical Engineering
Additional Information: Copyright of this article belongs to SPIE - The International Society for Optical Engineering
Keywords: atomic force microscopy;capacitance;gallium arsenide;germanium;III V semiconductors;interface roughness;MOCVD;photoluminescence;semiconductor heterojunctions;solar cells;transmission electron microscopy
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 26 Jul 2007
Last Modified: 27 Aug 2008 12:43
URI: http://eprints.iisc.ac.in/id/eprint/10315

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