Free Trions with Near-Unity Quantum Yield in Monolayer MoSe2

被引：28

作者：

Kim, Bumho ^{[1
]}

Luo, Yue ^{[2
,3
,4
]}

Rhodes, Daniel ^{[1
]}

Bai, Yusong ^{[5
]}

Wang, Jue ^{[5
]}

Liu, Song ^{[1
]}

Jordan, Abraham ^{[5
]}

Huang, Baili ^{[6
]}

Li, Zhaochen ^{[6
]}

Taniguchi, Takashi ^{[7
]}

Watanabe, Kenji ^{[8
]}

Owen, Jonathan ^{[5
]}

Strauf, Stefan ^{[2
]}

Barmak, Katayun ^{[6
]}

Zhu, Xiaoyang ^{[5
]}

Hone, James ^{[1
]}

机构：

[1] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

[2] Stevens Inst Technol, Dept Phys, Hoboken, NJ 07030 USA

[3] Harvard Univ, Ctr Nanoscale Syst, Cambridge, MA 02138 USA

[4] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[5] Columbia Univ, Dept Chem, New York, NY 10027 USA

[6] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA

[7] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki 3050044, Japan

[8] Natl Inst Mat Sci, Funct Mat Res Ctr, Tsukuba, Ibaraki 3050044, Japan

来源：

ACS NANO | 2022年 / 16卷 / 01期

基金：

美国国家科学基金会;

关键词：

transition metal dichalcogenide; MoSe2; trion; quantum yield; intrinsic lifetime; diffusion; DYNAMICS; EXCITONS; BIEXCITONS; TRANSPORT;

D O I：

10.1021/acsnano.1c04331

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Trions, quasiparticles composed of an electron-hole pair bound to a second electron and/or hole, are many-body states with potential applications in optoelectronics. Trions in monolayer transition metal dichalcogenide (TMD) semiconductors have attracted recent interest due to their valley/spin polarization, strong binding energy, and tunability through external gate control. However, low materials quality (i.e., high defect density) has hindered efforts to understand the intrinsic properties of trions. The low photoluminescence (PL) quantum yield (QY) and short lifetime of trions have prevented harnessing them in device applications. Here, we study the behavior of trions in a series of MoSe2 monolayers, with atomic defect density varying by over 2 orders of magnitude. The QY increases with decreasing defect density and approaches unity in the cleanest material. Simultaneous measurement of the PL lifetime yields both the intrinsic radiative lifetime and the defect-dependent nonradiative lifetime. The long lifetime of similar to 230 ps of trions allows direct observation of their diffusion.

引用

页码：140 / 147

页数：8

共 52 条

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