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Applied Physics Letters / Volume 96 / Issue 9 / ELECTRONIC TRANSPORT AND SEMICONDUCTORS

Appl. Phys. Lett. 96, 092104 (2010); doi:10.1063/1.3340459 (3 pages)

Influence of Na on Cu(In,Ga)Se2 solar cells grown on polyimide substrates at low temperature: Impact on the Cu(In,Ga)Se2/Mo interface

R. Caballero, C. A. Kaufmann, T. Eisenbarth, A. Grimm, I. Lauermann, T. Unold, R. Klenk, and H. W. Schock

Helmholtz Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109 Berlin, Germany

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(Received 20 November 2009; accepted 9 February 2010; published online 2 March 2010)

There are still open questions regarding the nature of the positive effect of the presence of Na on the performance of Cu(In,Ga)Se2 based, chalcopyrite thin film solar cells, especially at low processing temperatures. Studying Cu(In,Ga)Se2 thin film devices fabricated from low-temperature coevaporated absorbers on polyimide substrates by admittance and J-V-T measurements, characteristic properties are identified for different amounts of Na present during the growth. A roll-over behavior can be directly correlated with the Na-content. X-ray photoelectron spectroscopy shows the development of a MoSe2 phase at the back contact of the device. Efficiencies of 15.1% with MgF2 antireflection coating are demonstrated.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

antireflection coatings, copper compounds, electric admittance, gallium compounds, indium compounds, magnesium compounds, molybdenum, semiconductor growth, semiconductor-metal boundaries, solar absorber-convertors, solar cells, ternary semiconductors, vapour deposition, X-ray photoelectron spectra

PACS

  • 88.40.jn

    Thin film Cu-based I-III-VI2 solar cells

  • 81.15.Kk

    Vapor phase epitaxy; growth from vapor phase

  • 88.40.H-

    Solar cells (photovoltaics)

  • 79.60.Bm

    Clean metal, semiconductor, and insulator surfaces

  • 73.40.Ns

    Metal-nonmetal contacts

ARTICLE DATA

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http://link.aip.org/link/doi/10.1063/1.3340459

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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