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Using pulsed mode scanning electron microscopy for cathodoluminescence studies on hybrid perovskite films

Published version
Peer-reviewed

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Abstract

jats:titleAbstract</jats:title> jats:pThe 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.</jats:p>

Description

Keywords

hybrid perovskite, cathodoluminescence, pulsed mode, beam damage, hyperspectral mapping

Journal Title

Nano Express

Conference Name

Journal ISSN

2632-959X
2632-959X

Volume Title

2

Publisher

IOP Publishing
Sponsorship
Engineering and Physical Sciences Research Council (EP/L015978/1)
Engineering and Physical Sciences Research Council (EP/P007767/1)
European Research Council (756962)
Engineering and Physical Sciences Research Council (EP/R023980/1)
Engineering and Physical Sciences Research Council (EP/R025193/1)
Engineering and Physical Sciences Research Council (EP/P024947/1)
Royal Society (UF150033)
Engineering and Physical Sciences Research Council (EP/S019367/1)
Engineering and Physical Sciences Research Council (EP/R00661X/1)
J.F.O and C.D. acknowledge funding from the Engineering and Physical Sciences Research Council (EPSRC) Nano Doctoral Training Centre (EP/L015978/1). J.FO. and S.D.S. acknowledge the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (HYPERION, grant agreement no. 756962). E.M.T. thanks the ERC Horizon 2020 research and innovation programme (Marie Skłodowska-Curie, grant agreement no. 841265). S.D.S. and E.M.T. acknowledge funding from the EPSRC (EP/R023980/1), from the EPSRC Centre for Advanced Materials for Integrated Energy Systems (CAM-IES, EP/P007767/1), and the Cambridge Royce facilities grant (EP/P024947/1). CL studies were supported by the EPSRC (EP/R025193/1). Dr. Christian Monachon from Attolight is thanked for his ongoing support of the CL system. Yu-Hsien Chiang from the Stranks group is thanked for his support in the sample preparation.