Large-area synthesis of monolayer WS₂ and its ambient-sensitive photo-detecting performance

Nanoscale
Changyong LanYong Liu

Abstract

We demonstrate the synthesis of large-area monolayer WS2 films by chemical vapor deposition (CVD) and investigate their photoresponse properties by fabricating n-type field effect transistors (FETs) with Al as the ohmic contact. Our CVD-grown monolayer WS2 shows an electron mobility of 0.91 cm(2) V(-1) s(-1) and an ON/OFF ratio of 10(6), indicating its comparable electronic properties to the mechanically exfoliated flake sample. In a vacuum, by applying a gate bias (60 V), the responsivity of the monolayer WS2 phototransistor can increase up to 18.8 mA W(-1) and a decent sub-second level response time can be maintained. In contrast, in air, it shows a very fast response time of less than 4.5 ms, but at the cost of responsivity reduction to 0.2 μA W(-1). Such a distinctive ambient-sensitive photo-detecting performance can be well-explained by the pronounced effect of charge-acceptor-like O2/H2O molecule adsorption/desorption on the photocarrier transport. Our CVD-grown high quality monolayer WS2 may pave the way for developing industrial-scale optoelectronic devices for photo-detecting and chemical sensing applications.

References

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Citations

Jan 23, 2016·ACS Applied Materials & Interfaces·Zhiyan JiaZhongyuan Liu
May 7, 2016·ACS Applied Materials & Interfaces·Jiandong YaoGuowei Yang
Nov 4, 2016·Advanced Materials·Dain LeeJeong Ho Cho
Jun 29, 2016·ACS Applied Materials & Interfaces·Changyong LanYong Liu
Nov 30, 2016·Scientific Reports·Yang YuCharles Surya
Jan 14, 2016·Scientific Reports·Kathleen M McCrearyBerend T Jonker
Aug 31, 2018·Physical Chemistry Chemical Physics : PCCP·Soohyun ChoSeung Ryong Park
Nov 4, 2017·Scientific Reports·Francesco RealeCecilia Mattevi
Mar 19, 2021·Physical Chemistry Chemical Physics : PCCP·Tanmay Sarkar AkashMd Mahbubul Islam
Feb 28, 2020·Nano-micro Letters·Ali ZavabetiJian Zhen Ou
Jul 7, 2017·ACS Omega·Si ZhouJamie H Warner
Apr 10, 2020·ACS Nano·Tsung-Han TsaiPo-Wen Chiu
Dec 10, 2016·ACS Applied Materials & Interfaces·Ye FanJamie H Warner
Sep 27, 2018·ACS Applied Materials & Interfaces·Kartikey ThakarSaurabh Lodha
Feb 1, 2019·ACS Applied Materials & Interfaces·Tongxin ChenJamie H Warner
Sep 29, 2020·Chemistry of Materials : a Publication of the American Chemical Society·Niting ZengDavid J Lewis
May 6, 2019·ACS Applied Materials & Interfaces·Jiajun ChenJunyong Kang

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