Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit

Ankur Sharma; Linglong Zhang; Jonathan O. Tollerud; Miheng Dong; Yi Zhu; Robert Halbich; Tobias Vogl; Kun Liang; Hieu T. Nguyen; Fan Wang; Shilpa Sanwlani; Stuart K. Earl; Daniel Macdonald; Ping Koy Lam; Jeffrey A. Davis; Yuerui Lu

doi:10.1038/s41377-020-00347-y

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Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit

Original Articles

- Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit
- Light: Science & Applications Vol. 9, Issue 4, Pages: 1130-1142(2020)
- Affiliations：
  
  1.Research School of Electrical, Energy and Materials Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
  2.Optical Sciences Centre, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
  3.ARC Centre of Excellence for Future Low-Energy Electronics Technology, Australia
  4.Centre for Quantum Computation and Communication Technology, Department of Quantum Science, Research School of Physics and Engineering, The Australian National University, Acton, ACT 2601, Australia
  5.School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China
  6.Institute for Biomedical Materials and Devices (IBMD), Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia
- Author bio：
  
  Yuerui Lu (yuerui.lu@anu.edu.au)
- Funds：
- DOI：10.1038/s41377-020-00347-y
  CLC：
- Published：2020，
  
  Published Online：06 July 2020，
  
  Received：08 March 2020，
  
  Revised：14 May 2020，
  
  Accepted：09 June 2020
- Accepted：
Scan QR Code
Sharma, A. et al. Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit. Light: Science & Applications, 9, 1130-1142 (2020).
DOI：

Sharma, A. et al. Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit. Light: Science & Applications, 9, 1130-1142 (2020). DOI： 10.1038/s41377-020-00347-y.

摘要

Abstract

Long-range and fast transport of coherent excitons is important for the development of high-speed excitonic circuits and quantum computing applications. However

most of these coherent excitons have only been observed in some low-dimensional semiconductors when coupled with cavities

as there are large inhomogeneous broadening and dephasing effects on the transport of excitons in their native states in materials. Here

by confining coherent excitons at the 2D quantum limit

we first observed molecular aggregation-enabled 'supertransport' of excitons in atomically thin two-dimensional (2D) organic semiconductors between coherent states

with a measured high effective exciton diffusion coefficient of ~346.9 cm

/s at room temperature. This value is one to several orders of magnitude higher than the values reported for other organic molecular aggregates and low-dimensional inorganic materials. Without coupling to any optical cavities

the monolayer pentacene sample

a very clean 2D quantum system (~1.2 nm thick) with high crystallinity (J-type aggregation) and minimal interfacial states

showed superradiant emission from Frenkel excitons

which was experimentally confirmed by the temperature-dependent photoluminescence (PL) emi

ssion

highly enhanced radiative decay rate

significantly narrowed PL peak width and strongly directional in-plane emission. The coherence in monolayer pentacene samples was observed to be delocalised over ~135 molecules

which is significantly larger than the values (a few molecules) observed for other organic thin films. In addition

the supertransport of excitons in monolayer pentacene samples showed highly anisotropic behaviour. Our results pave the way for the development of future high-speed excitonic circuits

fast OLEDs

and other optoelectronic devices.

关键词

Keywords

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