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Optimising The Parameters For The Synthesis Of Cuin-Nanoparticles By Chemical Reduction Method For Chalcopyrite Thin Film Precursors

Published online by Cambridge University Press:  21 August 2013

Matthias Schuster
Affiliation:
Department Materials Science, Chair Materials for Electronics and Energy Technology, Friedrich-Alexander-University of Erlangen-Nürnberg, Martensstr. 7, 91058 Erlangen, Germany;
Stefan A. Möckel
Affiliation:
Department Materials Science, Chair Materials for Electronics and Energy Technology, Friedrich-Alexander-University of Erlangen-Nürnberg, Martensstr. 7, 91058 Erlangen, Germany;
Rachmat Adhi Wibowo
Affiliation:
Chair for Crystallography and Structure Physics, Friedrich-Alexander-University of Erlangen-Nürnberg, Staudtstr. 3, 91058 Erlangen, Germany.
Rainer Hock
Affiliation:
Chair for Crystallography and Structure Physics, Friedrich-Alexander-University of Erlangen-Nürnberg, Staudtstr. 3, 91058 Erlangen, Germany.
Peter J. Wellmann
Affiliation:
Department Materials Science, Chair Materials for Electronics and Energy Technology, Friedrich-Alexander-University of Erlangen-Nürnberg, Martensstr. 7, 91058 Erlangen, Germany;
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Abstract

Roll-to-roll deposition techniques for the fabrication of chalcopyrite solar cells are of major interest and are a promising alternative to state of the art vacuum processes. However, for roll-to-roll processes the preparation of precursor materials like nanoparticle inks is a crucial point. In this work a study on the preparation technique of copper-indium intermetallic nanoparticles was conducted. The preparation of the nanoparticles is based on the chemical reduction of copper and indium cations with sodium borohydride. Different parameters are discussed regarding their influence on (1) size and shape of the nanoparticles, (2) Cu/In ratio within the synthesised nanoparticles and (3) yield of the synthesis. Results show a strong dependency of the Cu/In ratio of the nanoparticles and the yield of the synthesis on the synthesis parameters. The influence of different parameters like (a) the ratio of metal cations to BH4- anions, (b) the Cu2+/In3+ cation ratio within the precursor solution and (c) the dropping rate of the copper-indium precursor solution are discussed. The Cu/In ratio within the nanoparticles can mainly be controlled by the Cu2+/In3+ cation ratio and the dropping rate of the copper-indium precursor solution. The yield of the synthesis shows saturation behaviour depending on the ratio of metal cations to BH4- anions. Shape and size of the nanoparticles are independent of the varied parameters.

Type
Articles
Copyright
Copyright © Materials Research Society 2013 

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References

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