Microcavity-like exciton-polaritons can be the primary photoexcitation in bare organic semiconductors

Abstract

Strong-coupling between excitons and confined photonic modes can lead to the formation of new quasi-particles termed exciton-polaritons which can display a range of interesting properties such as super-fluidity, ultrafast transport and Bose-Einstein condensation. Strong-coupling typically occurs when an excitonic material is confided in a dielectric or plasmonic microcavity. Here, we show polaritons can form at room temperature in a range of chemically diverse, organic semiconductor thin films, despite the absence of an external cavity. We find evidence of strong light-matter coupling via angle-dependent peak splittings in the reflectivity spectra of the materials and emission from collective polariton states. We additionally show exciton-polaritons are the primary photoexcitation in these organic materials by directly imaging their ultrafast (5 × 106 m s−1), ultralong (~270 nm) transport. These results open-up new fundamental physics and could enable a new generation of organic optoelectronic and light harvesting devices based on cavity-free exciton-polaritons

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Item Type:	Article
Authors/Creators:	Pandya, R Chen, RYS Gu, Q Sung, J Schnedermann, C Ojambati, OS Chikkaraddy, R Gorman, J Jacucci, G Onelli, OD Willhammar, T Johnstone, DN Collins, SM https://orcid.org/0000-0002-5151-6360 Midgley, PA Auras, F Baikie, T Jayaprakash, R Mathevet, F Soucek, R Du, M Alvertis, AM Ashoka, A Vignolini, S Lidzey, DG Baumberg, JJ Friend, RH Barisien, T Legrand, L Chin, AW Yuen-Zhou, J Saikin, SK Kukura, P Musser, AJ Rao, A
Copyright, Publisher and Additional Information:	© The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Dates:	Published: 11 November 2021 Published (online): 11 November 2021 Accepted: 29 September 2021
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds)
Depositing User:	Symplectic Publications
Date Deposited:	22 Nov 2021 10:29
Last Modified:	25 Jun 2023 22:49
Status:	Published
Publisher:	Nature Research
Identification Number:	10.1038/s41467-021-26617-w
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:180289

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Microcavity-like exciton-polaritons can be the primary photoexcitation in bare organic semiconductors

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