摘要
The exciton dynamics in a WS2 monolayer with strain are studied by transient absorption measurements.We measure the differential transmission signal from monolayer WS2 as a function of the probe wavelength at different levels of strain applied to the sample.The differential transmission spectrum has a positive maximum value at about 614 nm and shows no significant strain dependence.By time-resolving the differential transmission signal,we find that the strain has a minimal effect on the exciton formation process.However,the exciton lifetime is significantly reduced by strain.These results provide useful information for applications of WS2 in flexible electronic and optoelectronic devices where strain is inevitable.
The exciton dynamics in a WS2 monolayer with strain are studied by transient absorption measurements. We measure the differential transmission signal from monolayer WS2 as a function of the probe wavelength at different levels of strain applied to the sample. The differential transmission spectrum has a positive maximum value at about 614 nm and shows no significant strain dependence. By time-resolving the differential transmission signal, we find that the strain has a minimal effect on the exciton formation process. However, the exciton lifetime is significantly reduced by strain. These results provide useful information for applications of WS2 in flexible electronic and optoelectronic devices where strain is inevitable.
基金
Project supported by the National Key Research and Development Program of China(Grant No.2016YFA0202302)
the National Natural Science Foundation of China(Grant Nos.61527817 and 61875236)
the Initiative Postdocs Supporting Program of China(Grant No.BX201600013)
the General Financial Grant from the China Postdoctoral Science Foundation(Grant No.2017M610756)
the Overseas Expertise Introduction Center for Discipline Innovation,China
the 111 Center of China
