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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Computational Chemistry

Background:

  • Cesium silver bismuth bromide (Cs2AgBiBr6) is a halide double perovskite with potential for solar cells and LEDs.
  • Understanding its excited states is key to optimizing its optoelectronic properties.

Purpose of the Study:

  • Investigate the excited states of Cs2AgBiBr6.
  • Accurately predict its absorption and emission properties.
  • Clarify the origins of its photoluminescence.

Main Methods:

  • Time-dependent density functional theory (TD-DFT).
  • Nonempirical hybrid functionals: PBE0(α) and dielectric-dependent hybrids (DDH).
  • Analysis of direct, indirect, and self-trapped excitons.

Main Results:

  • TD-DFT with hybrid functionals accurately predicts the absorption spectrum.
  • The fundamental band gap of Cs2AgBiBr6 was underestimated in prior studies.
  • Experimental photoluminescence at 1.9-2.0 eV is linked to self-trapped excitons and electron polarons.
  • A complex interplay of direct, indirect, and self-trapped excitons was identified.

Conclusions:

  • Advanced computational methods provide accurate predictions for Cs2AgBiBr6 optoelectronic properties.
  • Self-trapped excitons and electron polarons are responsible for the observed photoluminescence.
  • The findings offer insights into halide double perovskites for next-generation optoelectronic devices.