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Fine Structure of the Optical Absorption Resonance in Cs~2~AgBiBr~6~ Double Perovskite Thin Films by Alexander Schmitz; L. Leander Schaberg; Svetlana Sirotinskaya; Martina Pantaler; Doru C. Lupascu; Niels Benson; Gerd Bacher is a Engineering article available to read on EtoBox.

What is Fine Structure of the Optical Absorption Resonance in Cs~2~AgBiBr~6~ Double Perovskite Thin Films about?

The lead-free double perovskite Cs 2 AgBiX 6 (X = Br, Cl) has recently demonstrated great potential for applications in solar cells, photodetectors, and X-ray detectors. This material is characterized by a dominant resonant absorption feature in the UV-blue spectral region, which is still under controversial discussion regarding its origin. Here, we uncover an electronic fine structure of this optical feature in Cs 2 AgBiBr 6 thin films. A detailed temperature-resolved study combining photoluminescence (PL), photoluminescence excitation (PLE), and absorption spectroscopy reveals the existence of three optical transitions, situated approximately 100 meV around the resonance at 2.83 eV. PL measurements under pulsed excitation uncover a short-lived blue emission at the absorption resonance energy that persists up to room temperature and indicates the competition of direct emission from the resonant state and fast relaxation into the red emissive ground state. We derive a comprehensive energy scheme and suggest possible mechanisms leading to the observed fine structure splitting.

Who reads Fine Structure of the Optical Absorption Resonance in Cs~2~AgBiBr~6~ Double Perovskite Thin Films?

Author

Alexander Schmitz; L. Leander Schaberg; Svetlana Sirotinskaya; Martina Pantaler; Doru C. Lupascu; Niels Benson; Gerd Bacher

Publisher

American Chemical Society (ACS)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)