Carrier-Type Modulation and Mobility Improvement of Thin MoTe2

© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 29(2017), 39 vom: 07. Okt.
1. Verfasser: Qu, Deshun (VerfasserIn)
Weitere Verfasser: Liu, Xiaochi, Huang, Ming, Lee, Changmin, Ahmed, Faisal, Kim, Hyoungsub, Ruoff, Rodney S, Hone, James, Yoo, Won Jong
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article MoTe2 controllable doping mobility improvement unipolar transistors
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520 |a A systematic modulation of the carrier type in molybdenum ditelluride (MoTe2 ) field-effect transistors (FETs) is described, through rapid thermal annealing (RTA) under a controlled O2 environment (p-type modulation) and benzyl viologen (BV) doping (n-type modulation). Al2 O3 capping is then introduced to improve the carrier mobilities and device stability. MoTe2 is found to be ultrasensitive to O2 at elevated temperatures (250 °C). Charge carriers of MoTe2 flakes annealed via RTA at various vacuum levels are tuned between predominantly pristine n-type ambipolar, symmetric ambipolar, unipolar p-type, and degenerate-like p-type. Changes in the MoTe2 -transistor performance are confirmed to originate from the physical and chemical absorption and dissociation of O2 , especially at tellurium vacancy sites. The electron branch is modulated by varying the BV dopant concentrations and annealing conditions. Unipolar n-type MoTe2 FETs with a high on-off ratio exceeding 106 are achieved under optimized doping conditions. By introducing Al2 O3 capping, carrier field effect mobilities (41 for holes and 80 cm2 V-1 s-1 for electrons) and device stability are improved due to the reduced trap densities and isolation from ambient air. Lateral MoTe2 p-n diodes with an ideality factor of 1.2 are fabricated using the p- and n-type doping technique to test the superb potential of the doping method in functional electronic device applications 
650 4 |a Journal Article 
650 4 |a MoTe2 
650 4 |a controllable doping 
650 4 |a mobility improvement 
650 4 |a unipolar transistors 
700 1 |a Liu, Xiaochi  |e verfasserin  |4 aut 
700 1 |a Huang, Ming  |e verfasserin  |4 aut 
700 1 |a Lee, Changmin  |e verfasserin  |4 aut 
700 1 |a Ahmed, Faisal  |e verfasserin  |4 aut 
700 1 |a Kim, Hyoungsub  |e verfasserin  |4 aut 
700 1 |a Ruoff, Rodney S  |e verfasserin  |4 aut 
700 1 |a Hone, James  |e verfasserin  |4 aut 
700 1 |a Yoo, Won Jong  |e verfasserin  |4 aut 
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773 1 8 |g volume:29  |g year:2017  |g number:39  |g day:07  |g month:10 
856 4 0 |u http://dx.doi.org/10.1002/adma.201606433  |3 Volltext 
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