nanoxNJOPFMNano ExpressNANOXNano Express2632-959XIOP Publishingnanoxabfe3c10.1088/2632-959X/abfe3cabfe3cNANOX-100444.R1PaperFocus on Cathodoluminescence and Electron Beam Induced Current of Semiconductor NanostructuresUsing pulsed mode scanning electron microscopy for cathodoluminescence studies on hybrid perovskite films0000-0002-0432-5932Ferrer OrriJordi120000-0003-0071-8445TennysonElizabeth M10000-0003-2743-1022KuschGunnar20000-0003-2775-610XDivitiniGiorgio20000-0003-3758-1198MacphersonStuart1OliverRachel A2DucatiCaterina2cd251@cam.ac.uk0000-0002-8303-7292StranksSamuel D13sds65@cam.ac.uksds65@cam.ac.uk Cavendish Laboratory, University of Cambridge, United Kingdom Department of Materials Science and Metallurgy, University of Cambridge, United Kingdom Department of Chemical Engineering and Biotechnology, University of Cambridge, United Kingdom

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16202114052021140520212202400231122020150420210505202116042021© 2021 The Author(s). Published by IOP Publishing Ltd2021 Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.Abstract

The use of pulsed mode scanning electron microscopy cathodoluminescence (CL) for both hyperspectral mapping and time-resolved measurements is found to be useful for the study of hybrid perovskite films, a class of ionic semiconductors that have been shown to be beam sensitive. A range of acquisition parameters is analysed, including beam current and beam mode (either continuous or pulsed operation), and their effect on the CL emission is discussed. Under optimized acquisition conditions, using a pulsed electron beam, the heterogeneity of the emission properties of hybrid perovskite films can be resolved via the acquisition of CL hyperspectral maps. These optimized parameters also enable the acquisition of time-resolved CL of polycrystalline films, showing significantly shorter lived charge carriers dynamics compared to the photoluminescence analogue, hinting at additional electron beam-specimen interactions to be further investigated. This work represents a promising step to investigate hybrid perovskite semiconductors at the nanoscale with CL.

hybrid perovskitecathodoluminescencepulsed modebeam damagehyperspectral mappingEngineering and Physical Sciences Research Council https://doi.org/10.13039/501100000266 EP/L015978/1EP/P007767/1EP/P024947/1EP/R023980/1EP/R025193/1Horizon 2020 Framework Programme https://doi.org/10.13039/100010661 756962841265ccc2632-959X/21/024002+10$33.00crossmarkyes