Optical tuning of exciton and trion emissions in monolayer phosphorene

Jiong Yang; Renjing Xu; Jiajie Pei; Ye Win Myint; Fan Wang; Zhu Wang; Shuang Zhang; Zongfu Yu; Yuerui Lu

doi:10.1038/lsa.2015.85

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Optical tuning of exciton and trion emissions in monolayer phosphorene

Original Articles

- Optical tuning of exciton and trion emissions in monolayer phosphorene
- Light: Science & Applications Vol. 4, Issue 3, (2015)
- Affiliations：
  
  1.Research School of Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 0200, Australia
  2.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
  3.Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200, Australia
  4.Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI 53706, USA
- Author bio：
  
  Y Lu, E-mail: yuerui.lu@anu.edu.au
- Funds：
- DOI：10.1038/lsa.2015.85
  CLC：
- Published：2015-09，
  
  Published Online：01 April 2015，
  
  Received：21 December 2014，
  
  Revised：30 March 2015，
  
  Accepted：31 March 2015
- Accepted：
Scan QR Code
Yang, J. et al. Optical tuning of exciton and trion emissions in monolayer phosphorene. Light: Science & Applications, 4, e312 (2015).
DOI：

Yang, J. et al. Optical tuning of exciton and trion emissions in monolayer phosphorene. Light: Science & Applications, 4, e312 (2015). DOI： 10.1038/lsa.2015.85.

摘要

Abstract

Monolayer phosphorene provides a unique two-dimensional (2D) platform to investigate the fundamental dynamics of excitons and trions (charged excitons) in reduced dimensions. However

owing to its high instability

unambiguous identification of monolayer phosphorene has been elusive. Consequently

many important fundamental properties

such as exciton dynamics

remain underexplored. We report a rapid

noninvasive

and highly accurate approach based on optical interferometry to determine the layer number of phosphorene

and confirm the results with reliable photoluminescence measurements. Furthermore

we successful

ly probed the dynamics of excitons and trions in monolayer phosphorene by controlling the photo-carrier injection in a relatively low excitation power range. Based on our measured optical gap and the previously measured electronic energy gap

we determined the exciton binding energy to be ~0.3 eV for the monolayer phosphorene on SiO

/Si substrate

which agrees well with theoretical predictions. A huge trion binding energy of ~100 meV was first observed in monolayer phosphorene

which is around five times higher than that in transition metal dichalcogenide (TMD) monolayer semiconductor

such as MoS

. The carrier lifetime of exciton emission in monolayer phosphorene was measured to be ~220 ps

which is comparable to those in other 2D TMD semiconductors. Our results open new avenues for exploring fundamental phenomena and novel optoelectronic applications using monolayer phosphorene.

关键词

Keywords

excitonmonolayer phosphoreneoptical injectiontwo-dimensional materials

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