Long radiative lifetimes of excitons in monolayer transition-metal dichalcogenides MX 2 (M = Mo, W; X = S, Se)

Nur Baizura Mohamed; Hong En Lim; Feijiu Wang; Sandhaya Koirala; Shinichiro Mouri; Keisuke Shinokita; Yuhei Miyauchi; Kazunari Matsuda

doi:10.7567/APEX.11.015201

Long radiative lifetimes of excitons in monolayer transition-metal dichalcogenides MX ₂ (M = Mo, W; X = S, Se)

Nur Baizura Mohamed, Hong En Lim, Feijiu Wang, Sandhaya Koirala, Shinichiro Mouri, Keisuke Shinokita, Yuhei Miyauchi, Kazunari Matsuda

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

We studied the effective exciton radiative lifetimes of monolayer two-dimensional transition-metal dichalcogenides MX ₂ (M = Mo, W; X = S, Se). The photoluminescence (PL) quantum yield and PL decay time were measured for monolayer MoS₂, MoSe₂, WS₂, and WSe₂ at room temperature. Effective exciton radiative lifetimes of >10 ns were determined from the PL quantum yield of 10^-2 to 10^-3 and the PL decay time of several hundred picoseconds. The results are explained on the basis of the long radiative lifetime of bright excitons at a low temperature limit, a finite exciton coherence area of several square nanometers, and the population of dark exciton states.

Original language	English (US)
Article number	015201
Journal	Applied Physics Express
Volume	11
Issue number	1
DOIs	https://doi.org/10.7567/APEX.11.015201
State	Published - Jan 2018

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Long radiative lifetimes of excitons in monolayer transition-metal dichalcogenides MX ₂ (M = Mo, W; X = S, Se). / Mohamed, Nur Baizura; Lim, Hong En; Wang, Feijiu; Koirala, Sandhaya; Mouri, Shinichiro; Shinokita, Keisuke; Miyauchi, Yuhei; Matsuda, Kazunari.

In: Applied Physics Express, Vol. 11, No. 1, 015201, 01.2018.

Research output: Contribution to journal › Article › peer-review

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abstract = "We studied the effective exciton radiative lifetimes of monolayer two-dimensional transition-metal dichalcogenides MX 2 (M = Mo, W; X = S, Se). The photoluminescence (PL) quantum yield and PL decay time were measured for monolayer MoS2, MoSe2, WS2, and WSe2 at room temperature. Effective exciton radiative lifetimes of >10 ns were determined from the PL quantum yield of 10-2 to 10-3 and the PL decay time of several hundred picoseconds. The results are explained on the basis of the long radiative lifetime of bright excitons at a low temperature limit, a finite exciton coherence area of several square nanometers, and the population of dark exciton states.",

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AU - Mohamed, Nur Baizura

AU - Lim, Hong En

AU - Wang, Feijiu

AU - Koirala, Sandhaya

AU - Mouri, Shinichiro

AU - Shinokita, Keisuke

AU - Miyauchi, Yuhei

AU - Matsuda, Kazunari

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AB - We studied the effective exciton radiative lifetimes of monolayer two-dimensional transition-metal dichalcogenides MX 2 (M = Mo, W; X = S, Se). The photoluminescence (PL) quantum yield and PL decay time were measured for monolayer MoS2, MoSe2, WS2, and WSe2 at room temperature. Effective exciton radiative lifetimes of >10 ns were determined from the PL quantum yield of 10-2 to 10-3 and the PL decay time of several hundred picoseconds. The results are explained on the basis of the long radiative lifetime of bright excitons at a low temperature limit, a finite exciton coherence area of several square nanometers, and the population of dark exciton states.

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