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Related Concept Videos

Valence Bond Theory02:42

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
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Optically induced metastability in Cu(In,Ga)Se2.

S A Jensen1, A Kanevce1, L M Mansfield1

  • 1National Renewable Energy Laboratory, 15013 Denver West Pkwy., Golden, Colorado, 80401, USA.

Scientific Reports
|October 25, 2017
PubMed
Summary
This summary is machine-generated.

This study investigates metastability in Copper Indium Gallium Selenide (CIGS) solar cells, identifying a sub-bandgap optical transition that degrades carrier lifetime. Findings support an expanded divacancy model, aiding future photovoltaic technology assessments.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Renewable Energy

Background:

  • Copper Indium Gallium Selenide (CIGS) is a leading thin-film photovoltaic technology with over 22% efficiency.
  • Metastability, a light-induced material change over weeks, impacts CIGS solar cell performance.
  • A (VSe -VCu) divacancy model is the current explanation for CIGS metastability.

Purpose of the Study:

  • To provide experimental evidence for optically induced metastability in CIGS.
  • To expand the existing divacancy model using first-principles calculations.
  • To assess the impact of metastability on CIGS device performance.

Main Methods:

  • Photoluminescence excitation spectroscopy to identify optical transitions.
  • First-principles calculations to expand the divacancy model.
  • Determination of density-capture cross-section product for induced states.

Main Results:

  • Experimental confirmation of optically induced metastability transition.
  • Identification of a sub-bandgap optical transition that reduces carrier lifetime.
  • Validation of the expanded divacancy model, linking sub-conduction band states to metastability.

Conclusions:

  • The study validates and expands the divacancy model for CIGS metastability.
  • Identified states significantly degrade carrier lifetime and device performance.
  • Provides a framework for assessing metastability in thin-film photovoltaic technologies.