Red-blue effect in Cu(In,Ga)Se2-based devices revisited

M. Igalson, A. Urbaniak, P. Zabierowski, H. Abdel Maksoud, Marie Buffiere, N. Barreau, S. Spiering

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The controversial issue of a source for the fill factor losses in Cu(In,Ga)Se2-based solar cells observed under red light is discussed. Experimental evidence is presented that removal of the fill factor loss by blue light is accompanied by a decrease in capacitance. Similar kinetics for both effects are observed. This effect is demonstrated not only on CdS-buffered devices but also on Zn(O,S)- and In2S3-buffered cells. The explanation, supported by simulations, is based on a model of a reduction of the p + layer by holes photogenerated in the buffer. This effect might be differentiated from the effect of a photosensitive secondary barrier in the buffer-window part of the junction by a sign of the capacitance change under blue light.

Original languageEnglish
Pages (from-to)302-306
Number of pages5
JournalThin Solid Films
Issue number1
Publication statusPublished - 15 May 2013
Externally publishedYes



  • Alternative buffers
  • Capacitance
  • CIGS
  • Fill factor
  • Solar cells

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Igalson, M., Urbaniak, A., Zabierowski, P., Maksoud, H. A., Buffiere, M., Barreau, N., & Spiering, S. (2013). Red-blue effect in Cu(In,Ga)Se2-based devices revisited. Thin Solid Films, 535(1), 302-306.