期刊
ACS NANO
卷 11, 期 11, 页码 10808-10815出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b03457
关键词
molybdenum disulfide; photoluminescence; trion; 2D materials; doping
类别
资金
- Research Grant Council of Hong Kong SAR [16204815]
- Center for 1D/2D Quantum Materials
- Innovation and Technology Commission [ITC-CNERC14SC01, ITS/267/15]
The 2D geometry nature and low dielectric constant in transition-metal dichalcogenides lead to easily formed strongly bound excitons and trions. Here, we studied the photoluminescence of van der Waals heterostructures of monolayer MoS2 and graphene at room temperature and observed two photoluminescence peaks that are associated with trion emission. Further study of different hetero-structure configurations confirms that these two peaks are intrinsic to MoS2 and originate from a bound state and Fermi level, respectively, of which both accept recoiled electrons from trion recombination. We demonstrate that the recoil effect allows us to electrically control the photon energy of trion emission by adjusting the gate voltage. In addition, significant thermal smearing at room temperature results in capture of recoil electrons by bound states, creating photoemission peak at low doping level whose photon energy is less sensitive to gate voltage tuning. This discovery reveals an unexpected role of bound states for photoemission, where binding of recoil electrons becomes important.
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