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Journal of Materials Science: Materials in Electronics

, Volume 29, Issue 17, pp 14406–14415 | Cite as

Metallic/chalcogen dual phase effects on dielectric relaxations, resonance and spectroscopic impedance in amorphous chalcopyrite CuxInyGa10Se70−xTe20−y thin films

  • Harkawal Singh
  • Amardeep Bharti
  • Navdeep Goyal
  • P. S. Gill
Article
  • 44 Downloads

Abstract

Copper Indium Gallium Diselenide (CIGS) is a well-known chalcopyrite photovoltaic material for its highest efficiency and flexibility. It is necessary to maintain this technology economic and affordable for better commercial use without affecting performance. We fabricate the structurally complex, the pentanary CuxInyGa10Se70−xTe20−y (CIGST) composition in bulk and thin film form through economic melt-quench and thermal evaporation technique respectively to enhance the light trapping centers by obviating unnecessary reflection through structural complexities. We are first to report the frequency dependent optical parameters and dielectric response of compounds having composition varied from metallic rich phase to chalcogen rich phase at around 10% of constant Gallium to understand their interaction in an electromagnetic field through UV–Vis spectroscopy and LCR meter experiment. Enhanced absorbance edge with multiple band gap has translated the divergence of complex dielectric function from the standard Drude model at optical (higher) frequencies. Multiple relaxations occur along with the dipolar relaxation at electrical (lower) frequencies depicts the varied Debye behavior. Photo-response has been measured through impedance spectroscopy which shows a loss in the order of 3 KΩ under illumination depicts the significant charge carrier generation, led to the excellent photovoltaic properties of CIGST cells.

Notes

Acknowledgements

The authors acknowledge the support given by University Grants Commission (UGC) and Department of Physics, Panjab University, Chandigarh for major research project (F.No-42-898/2-13(SR)).

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of PhysicsPanjab UniversityChandigarhIndia
  2. 2.Sri Guru Gobind Singh CollegeChandigarhIndia

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