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    Accurate Extraction of Charge Carrier Mobility in 4-Probe Field-Effect Transistors

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    Choi et al. AFM_2018.pdf
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    Type
    Article
    Authors
    Choi, Hyun Ho
    Rodionov, Yaroslav I.
    Paterson, Alexandra
    Panidi, Julianna
    Saranin, Danila
    Kharlamov, Nikolai
    Didenko, Sergei I.
    Anthopoulos, Thomas D. cc
    Cho, Kilwon
    Podzorov, Vitaly
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2018-04-30
    Online Publication Date
    2018-04-30
    Print Publication Date
    2018-06
    Permanent link to this record
    http://hdl.handle.net/10754/627753
    
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    Abstract
    Charge carrier mobility is an important characteristic of organic field-effect transistors (OFETs) and other semiconductor devices. However, accurate mobility determination in FETs is frequently compromised by issues related to Schottky-barrier contact resistance, that can be efficiently addressed by measurements in 4-probe/Hall-bar contact geometry. Here, it is shown that this technique, widely used in materials science, can still lead to significant mobility overestimation due to longitudinal channel shunting caused by voltage probes in 4-probe structures. This effect is investigated numerically and experimentally in specially designed multiterminal OFETs based on optimized novel organic-semiconductor blends and bulk single crystals. Numerical simulations reveal that 4-probe FETs with long but narrow channels and wide voltage probes are especially prone to channel shunting, that can lead to mobilities overestimated by as much as 350%. In addition, the first Hall effect measurements in blended OFETs are reported and how Hall mobility can be affected by channel shunting is shown. As a solution to this problem, a numerical correction factor is introduced that can be used to obtain much more accurate experimental mobilities. This methodology is relevant to characterization of a variety of materials, including organic semiconductors, inorganic oxides, monolayer materials, as well as carbon nanotube and semiconductor nanocrystal arrays.
    Citation
    Choi HH, Rodionov YI, Paterson AF, Panidi J, Saranin D, et al. (2018) Accurate Extraction of Charge Carrier Mobility in 4-Probe Field-Effect Transistors. Advanced Functional Materials: 1707105. Available: http://dx.doi.org/10.1002/adfm.201707105.
    Sponsors
    The authors are grateful to the following programs for the financial support of this work: the National Science Foundation under the grant DMR-1506609, the Rutgers Energy Institute (REI), the Center for Advanced Soft-Electronics funded by the Ministry of Science, ICT and Future Planning as Global Frontier Project (CASE-2011-0031628), and the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» (№ K3-2016-004), implemented by a governmental decree dated 16th of March 2013, N 211. T.D.A., and A.F.P, acknowledge the King Abdullah University of Science and Technology (KAUST) for financial support.
    Publisher
    Wiley
    Journal
    Advanced Functional Materials
    DOI
    10.1002/adfm.201707105
    Additional Links
    https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201707105
    ae974a485f413a2113503eed53cd6c53
    10.1002/adfm.201707105
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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