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Local Maps of the Polarization and Depolarization in Organic Ferroelectric Field-Effect Transistors

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Cai, Ronggang [UCL] Jonas, Alain M. [UCL]

We study the local ferroelectric polarization and depolarization of poly(vinylidene fluoride-cotrifluoroethylene) (P(VDF-TrFE)) in p-type ferroelectric field-effect transistors (FeFETs). Piezoresponse force microscopy (PFM) is used to obtain local maps of the polarization on model metal-semiconductorferroelectric stacks, and on FeFETs stripped from their top-gate electrode; transfer curves are measured on complete FeFETs. The influence of the semiconductor layer thickness and of the polarity and amplitude of the poling voltage are investigated. In accumulation, the stable “on” state consists of a uniform upward-polarized ferroelectric layer, with compensation holes accumulating at the ferroelectric/semiconducting interface. In depletion, the stable “off” state consists of a depolarized region in the center of the transistor channel, surrounded by partially downward-polarized regions over the source and drain electrodes and neighboring regions. The partial depolarization of these regions is due to the incomplete screening of polarization charges by the charges of the remote electrodes. Therefore, thinner semiconducting layers provide higher downward polarizations, which result in a more depleted transistor channel and a higher charge injection barrier between the electrodes and the semiconductor, leading to lower threshold voltages and higher on/off current values at zero gate bias. Clues for optimization of the devices are finally provided.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2016
Language Anglais
Journal information "Scientific Reports" - Vol. 6, p. 22116 (2016)
Peer reviewed yes
Publisher Nature Publishing Group (London)
issn 2045-2322
e-issn 2045-2322
Publication status Publié
Affiliation UCL - SST/IMCN/BSMA - Bio and soft matter
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Bibliographic reference Cai, Ronggang ; Jonas, Alain M.. Local Maps of the Polarization and Depolarization in Organic Ferroelectric Field-Effect Transistors. In: Scientific Reports, Vol. 6, p. 22116 (2016)
Permanent URL http://hdl.handle.net/2078.1/172328