Fast Exciton Diffusion in Monolayer PtSe2

Wang, Pengzhi; He, Dawei; Wang, Yongsheng; Zhang, Xiaoxian; He, Jiaqi; Zhao, Hui

doi:10.1002/lpor.202100594

Fast Exciton Diffusion in Monolayer PtSe2

Journal Article · Sun Apr 24 00:00:00 EDT 2022 · Laser & Photonics Reviews

DOI:https://doi.org/10.1002/lpor.202100594· OSTI ID:1976356

Wang, Pengzhi ^[1]; He, Dawei ^[2]; Wang, Yongsheng ^[2]; Zhang, Xiaoxian ^[2]; He, Jiaqi ^[3]; ^[4]

Beijing University of Chemical Technology (China); Beijing Jiaotong University (China); OSTI
Beijing Jiaotong University (China)
Beijing University of Chemical Technology (China)
University of Kansas, Lawrence, KS (United States)

Recently, 2D noble metal dichalcogenides have drawn considerable attention due to their thickness-tunable electronic and optical properties. However, the dynamical properties of photocarriers in these materials are less studied. In this report photocarrier dynamics in monolayer and bilayer PtSe₂ samples prepared by chemical vapor deposition are studied by transient absorption microscopy. Spatially and temporally resolved differential reflectance measurements yield room-temperature exciton lifetimes of 25 and 50 ps for monolayer and bilayer samples, respectively. The exciton diffusion coefficient in monolayer PtSe₂ is found to be as large as 48 cm² s^-1. This value is higher than exciton diffusion coefficients of most known monolayer semiconductors. The deduced exciton mobility is close to the theoretical limit of charge carrier mobility of monolayer PtSe₂. The superior exciton transport property is unique to monolayers, as the exciton diffusion coefficient drops to 6.7 cm² s^-1 in bilayers PtSe₂. The novel exciton transport properties, along with its high air stability, make monolayer PtSe₂ an attractive material for ultrathin excitonic devices. These results provide insights on the exciton dynamic properties of 2D PtSe₂ and help develop fundamental understanding on the performance of various optoelectronic devices based on 2D PtSe₂. .

View Accepted Manuscript (DOE)

Research Organization:: University of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: Beijing Natural Science Foundation of China; Central Universities; National Natural Science Foundation of China; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0020995

OSTI ID:: 1976356

Alternate ID(s):: OSTI ID: 1864622

Journal Information:: Laser & Photonics Reviews, Journal Name: Laser & Photonics Reviews Journal Issue: 7 Vol. 16; ISSN 1863-8880

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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