Long radiative lifetimes of excitons in monolayer transition-metal dichalcogenides MX2 (M = Mo, W; X = S, Se)
Long radiative lifetimes of excitons in monolayer transition-metal dichalcogenides MX2 (M = Mo, W; X = S, Se)
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DOI：
10.7567/apex.11.015201
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发表时间：
2018-01-01
影响因子：
2.3
通讯作者：
Matsuda, Kazunari
中科院分区：
文献类型：
--
作者：
Mohamed, Nur Baizura;Lim, Hong En;Matsuda, Kazunari
研究了单层二维过渡金属二硫族化合物MX2 （M = Mo， W; X = S, Se）的有效激子辐射寿命。测量了室温下单层MoS2、MoSe2、WS2和WSe2的光致发光（PL）量子产率和PL衰减时间。根据PL量子产额为10(-2)~ 10（-3）和PL衰减时间为几百皮秒，确定了bbb10 ns的有效激子辐射寿命。从低温极限下亮激子的长辐射寿命、数平方纳米的有限激子相干面积和暗激子态的居群等方面解释了这一结果。(C) 2018日本应用物理学会
We studied the effective exciton radiative lifetimes of monolayer two-dimensional transition-metal dichalcogenides MX2 (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. (C) 2018 The Japan Society of Applied Physics