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The copolymer of vinylidene fluoride (VDF) with trifluoroethylene (TrFE) has attracted much interest due to the potential use in nonvolatile memory devices with easy formability. A repetitive application of electric stress causes a decrease of switchable polarization. This phenomenon, referred to as fatigue, is one of the primary sources of concern in the ferroelectric memory devices. Having realized...
Piezoelectric response force microscopy, PFM, is a kind of SPM technique. It measures the change of the position of surface in accordance with the applied voltage, giving local piezoelectric activity. This method is widely applied to ferroelectric ceramics as well as to ferroelectric polymers. We used this method to study the dynamics of polarization reversal in thin films of VDF/TrFE copolymer.
The copolymer of vinylidene fluoride (VDF) with trifluoroethylene (TrFE) is a ferroelectric polymer undergoing polarization reversal as a result of rotational motions of molecules about their chain axes. It requires a very high electric field of approximately 100 MV/m for polarization reversal. Therefore, the thickness reduction below 50 nm is a technological requirement to achieve low-voltage operations...
A metal-ferroelectrics-semiconductor (MFS) capacitor with a ferroelectric polymer as a gate dielectric has recently attracted much interest owing to its potential applications in nonvolatile memory. In order to understand switching dynamics, we performed simultaneous measurements of the charge Q and the capacitance C for Au/vinylidene fluoride- trifluoroethylene (VDF-TrFE) /n-Si structure using a...
The solder joint reliability of IGBT chip surface interconnection with a lead-frame structure is described in the power cycling (P/C) capability which is greatly improved due to a chip surface cooling effect in comparison with aluminum wire interconnection. The lead-frame is joined on a Ni and Au plated chip surface with Sn-Ag or Sn-Sb system solders. The P/C capability obtained with the Sn-Sb system...
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