TY - JOUR
T1 - Free Trions with Near-Unity Quantum Yield in Monolayer MoSe2
AU - Kim, Bumho
AU - Luo, Yue
AU - Rhodes, Daniel
AU - Bai, Yusong
AU - Wang, Jue
AU - Liu, Song
AU - Jordan, Abraham
AU - Huang, Baili
AU - Li, Zhaochen
AU - Taniguchi, Takashi
AU - Watanabe, Kenji
AU - Owen, Jonathan
AU - Strauf, Stefan
AU - Barmak, Katayun
AU - Zhu, Xiaoyang
AU - Hone, James
N1 - Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/1/25
Y1 - 2022/1/25
N2 - 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 230 ps of trions allows direct observation of their diffusion.
AB - 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 230 ps of trions allows direct observation of their diffusion.
KW - MoSe
KW - diffusion
KW - intrinsic lifetime
KW - quantum yield
KW - transition metal dichalcogenide
KW - trion
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U2 - 10.1021/acsnano.1c04331
DO - 10.1021/acsnano.1c04331
M3 - Article
C2 - 34935357
AN - SCOPUS:85122326337
SN - 1936-0851
VL - 16
SP - 140
EP - 147
JO - ACS Nano
JF - ACS Nano
IS - 1
ER -