Ferroelectric properties of spin-coated ultrathin (down to 10 nm) copolymer films

Müller, Klaus; Mandal, Dipankar; Henkel, Karsten; Paloumpa, Ioanna; Schmeisser, Dieter
September 2008
Applied Physics Letters;9/15/2008, Vol. 93 Issue 11, p112901
Academic Journal
Spin-cast films of the ferroelectric copolymer poly(vinylidene fluoride-trifluoroethylene) are attractive for various applications. For such films the question arises whether there exists a ferroelectric functionality depending on film thickness. We characterize the ferroelectric properties of ultrathin films down to a layer thickness of 10 nm with spectroscopic and electrical methods (capacitance-voltage). The measurements indicate an extrinsic switching mechanism with a much lower operation voltage than that for a collective intrinsic switching. Both independent methods agree that there is no critical thickness for spin-coated copolymer films down to 10 nm if an adapted system of electrodes is used.


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