Crystallographic phase changes and damage thresholds of CsPbI3 microwire waveguides through continuous wave photoablation

Russell, Kieran O, Osborne, Mark A and Fisher, Aidan A E (2020) Crystallographic phase changes and damage thresholds of CsPbI3 microwire waveguides through continuous wave photoablation. Materials Advances, 1 (2). pp. 161-166. ISSN 2633-5409

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Abstract

We investigate waveguide efficiency of CsPbI3 microwire waveguides and their photodegradation over a range of continuous wave laser excitation energies and intensities. Under modest laser input intensities <1 kW cm−2 we observe a wavelength dependent efficiency of light propagation in the waveguides. At increased power densities and wavelengths of 473 nm or shorter, microwires undergo photoablation into discrete fragments. Use of diffraction-limited excitation allowed localised cleavage of the microwires with observation of transient photoluminescence from degradation products. TEM analysis of the microwires revealed transformation from the yellow δ-phase to amorphous phases in the region of the photodamage with a degraded morphology consistent with efficient thermal transfer and induced melting.

Item Type: Article
Keywords: perovskites, optical nanomaterials, waveguides, laser ablation, photodegradation
Schools and Departments: School of Life Sciences > Chemistry
Research Centres and Groups: Energy and Materials Chemistry
Depositing User: Mark Osborne
Date Deposited: 20 Jul 2020 06:53
Last Modified: 20 Jul 2020 07:01
URI: http://sro.sussex.ac.uk/id/eprint/91223

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