Enhancement of electronic and optoelectronic performance of multilayer InSe via strain engineering
- 1 May 2020
- journal article
- research article
- Published by IOP Publishing in Semiconductor Science and Technology
- Vol. 35 (5), 055016
- https://doi.org/10.1088/1361-6641/ab73e9
Abstract
In this letter, we report a study on the strain-tuned optical bandgap, piezoresistive effect and photoresponse of multilayer beta-InSe. A redshift of photoluminescence is observed in multilayer InSe under uniaxial tensile strains and the shift rate of the optical gap is 57.7 meV/%. The multilayer InSe shows pronounced piezoresistive effect with a reduced resistance and the calculated gauge factor is 47, which is larger than those of graphene and traditional metal foils. The photoresponsivity of the photodetector is enhanced to 115.9 AW(-1) measured at 1.06% uniaxial tensile strain, three times higher than that of a device measured without strain. Our results demonstrate that strain-engineering can effectively modulate electronic and optoelectronic properties of multilayer InSe, opening a door for InSe applications in strain sensors, flexible photodetectors and electronic skin devices.Funding Information
- National Natural Science Foundation of China (21302029)
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