PMID- 25782370
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20150831
LR  - 20160128
IS  - 2040-3372 (Electronic)
IS  - 2040-3364 (Linking)
VI  - 7
IP  - 14
DP  - 2015 Apr 14
TI  - Large-area synthesis of monolayer WS(2) and its ambient-sensitive photo-detecting 
      performance.
PG  - 5974-80
LID - 10.1039/c5nr01205h [doi]
AB  - 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 22.1 
      A 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 0.24 mA 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. [Corrected]
FAU - Lan, Changyong
AU  - Lan C
AD  - State Key Laboratory of Electronic Thin Film and Integrated Device, School of 
      Optoelectronic Information, University of Electronic Science and Technology of 
      China, Chengdu, 610054, China. lichun@uestc.edu.cn.
FAU - Li, Chun
AU  - Li C
FAU - Yin, Yi
AU  - Yin Y
FAU - Liu, Yong
AU  - Liu Y
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - England
TA  - Nanoscale
JT  - Nanoscale
JID - 101525249
EIN - Nanoscale. 2015 Nov 14;7(42):17980. PMID: 26451498
EDAT- 2015/03/19 06:00
MHDA- 2015/03/19 06:01
CRDT- 2015/03/19 06:00
PHST- 2015/03/19 06:00 [entrez]
PHST- 2015/03/19 06:00 [pubmed]
PHST- 2015/03/19 06:01 [medline]
AID - 10.1039/c5nr01205h [doi]
PST - ppublish
SO  - Nanoscale. 2015 Apr 14;7(14):5974-80. doi: 10.1039/c5nr01205h.