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Choi, Kyoung Jin
Energy Conversion Materials (EcoMAT) Lab
Research Interests
  • Solar cells, thermoelectrics, piezoelectric

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Vertical Growth of Core-Shell III-V Nanowires for Solar Cells Application

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Title
Vertical Growth of Core-Shell III-V Nanowires for Solar Cells Application
Author
Kim, D. Y.Bae, M. H.Shin, J. C.Kim, Y. J.Lee, Y. J.Choi, Kyoung JinSeong, T. Y.Choi, W. J.
Keywords
Nanowire(s);  Core-Shell Nanowire(s);  Solar Cell;  MOCVD;  III-V Compound(s)
Issue Date
201404
Publisher
AMER SCIENTIFIC PUBLISHERS
Citation
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.14, no.4, pp.2913 - 2918
Abstract
High density (In)GaAs/GaAs/AlGaAs nanowires (NWs) consisting of n-type core and p-type shell have been vertically grown on (111) GaAs substrate using metal organic chemical vapor deposition (MOCVD) and fabricated into solar cells. Au colloidal nanoparticles (NPs) are employed as a catalyst. High density nanowires were obtained by uniform distribution of Au NPs. Fe-SEM, TEM and HRTEM images show that the morphology of shell is sensitive to p-doping concentration. Increase in the density of p-doping precursor results in "kinking" of NPs and rough shell surface. The origin of kinking has been explained by the GaAs twin phases due to Zn segregation on the surface of shell. It has been observed that the morphology of NPs can be controlled through optimizing various source purge technique of DEZn and deposition temperature. Electrical properties of core shell doped NWs are carried out using I V characterization. The core shell NWs show characteristics of p-n junction as revealed by I-V studies.
URI
http://scholarworks.unist.ac.kr/handle/201301/4207
DOI
http://dx.doi.org/10.1166/jnn.2014.8606
ISSN
1533-4880
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MSE_Journal Papers
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