Intrinsic carrier mobility of multi-layered MoS2 field-effect transistors on SiO2

By fabricating and characterizing multi-layered MoS2-based field-effect transistors in a four terminal configuration, we demonstrate that the two terminal-configurations tend to underestimate the carrier mobility μ due to the Schottky barriers at the contacts. For a back-gated two-terminal configura...

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Veröffentlicht in:Applied physics letters 2013-03, Vol.102 (12)
Hauptverfasser: Pradhan, N. R., Rhodes, D., Zhang, Q., Talapatra, S., Terrones, M., Ajayan, P. M., Balicas, L.
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container_issue 12
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container_title Applied physics letters
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creator Pradhan, N. R.
Rhodes, D.
Zhang, Q.
Talapatra, S.
Terrones, M.
Ajayan, P. M.
Balicas, L.
description By fabricating and characterizing multi-layered MoS2-based field-effect transistors in a four terminal configuration, we demonstrate that the two terminal-configurations tend to underestimate the carrier mobility μ due to the Schottky barriers at the contacts. For a back-gated two-terminal configuration, we observe mobilities as high as 91 cm2 V−1 s−1 which is considerably smaller than 306.5 cm2 V−1 s−1 as extracted from the same device when using a four-terminal configuration. This indicates that the intrinsic mobility of MoS2 on SiO2 is significantly larger than the values previously reported, and provides a quantitative method to evaluate the charge transport through the contacts.
doi_str_mv 10.1063/1.4799172
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title Intrinsic carrier mobility of multi-layered MoS2 field-effect transistors on SiO2
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