Two-dimensional(2D)WS2 offers great prospects for assembling next-generation optoelectronic and electronic devices due to its thickness-dependent optical and electronic properties.However,layer-number-controlled growt...Two-dimensional(2D)WS2 offers great prospects for assembling next-generation optoelectronic and electronic devices due to its thickness-dependent optical and electronic properties.However,layer-number-controlled growth of WS2 is still a challenge up to now.This work presents controlled growth of bilayer WS2 triangular flakes by carbon-nanoparticle-assisted chemical vapor deposition(CVD)process.The growth mechanism is also proposed.In addition,the field effect transistors(FETs)based on monolayer and bilayer WS2 are also fabricated and investigated.The bilayer FET displays a mobility of 34 cm2·V^-1·s^-1,much higher than that of the monolayer FET.The high figures of merit make bilayer WS2 a promising candidate in high-performance electronics and optoelectronics.展开更多
基金The authors are grateful for financial support from the National Natural Science Foundation of China(Nos.51920105004,51420105002,and 51572199)the Zhejiang Provincial Natural Science Foundation of China(No.LY19E030008).J.L.would like to thank Yaqi Huang for drawing the schematic.
文摘Two-dimensional(2D)WS2 offers great prospects for assembling next-generation optoelectronic and electronic devices due to its thickness-dependent optical and electronic properties.However,layer-number-controlled growth of WS2 is still a challenge up to now.This work presents controlled growth of bilayer WS2 triangular flakes by carbon-nanoparticle-assisted chemical vapor deposition(CVD)process.The growth mechanism is also proposed.In addition,the field effect transistors(FETs)based on monolayer and bilayer WS2 are also fabricated and investigated.The bilayer FET displays a mobility of 34 cm2·V^-1·s^-1,much higher than that of the monolayer FET.The high figures of merit make bilayer WS2 a promising candidate in high-performance electronics and optoelectronics.
