Improvement in the electronic quality of pulsed laser deposited CuIn0.7Ga0.3Se2 thin films via post-deposition elemental sulfur annealing process

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)50-56
Journal / PublicationThin Solid Films
Volume608
Publication statusPublished - 1 Jun 2016

Abstract

We synthesized CuIn0.7Ga0.3Se2 thin films on soda lime glass substrates using pulsed laser deposition and post-annealing under different conditions. Increasing substrate temperature during deposition and vacuum annealing after deposition both increased grain size but had negligible effect on the electronic properties of the films. As-deposited films demonstrated P-type conductivities with high carrier concentrations and low Hall mobilities, but annealing in elemental sulfur environment significantly improved the electronic properties of the films. We found that the incorporation of even small quantities of sulfur into the films reduced carrier concentrations by over three orders of magnitude and increased Hall mobilities by an order of magnitude. This resulted in films with resistivity ∼ 5 Ω·cm suitable for photovoltaic applications.

Research Area(s)

  • Cu(In,Ga)(Se,S)2 absorber, Elemental sulfur annealing, Hall effect, Pulsed laser deposition, Raman spectroscopy, Rutherford backscattering