Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
Volume 44, Issue 42-45, Pages L1385-L1388Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.44.L1385
Keywords
ferroelectric thin film; vinylidene fluoride/trifluoroethylene copolymer; switching characteristics; Au electrode; surface roughness; AFM
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Time-domain measurements of ferroelectric polarization reversal were conducted for spin-coated ultrathin vinylidene fluoride/trifluoroethylene copolymer films deposited with an Au electrode. It was found that full polarization reversal occurs in 50-330-nm-thick films that have switching time independent of the film thickness. We conclude that the thinning-induced increase in switching time reported previously is not a general feature of this copolymer but is specific to an Al-electrode-deposited sample. The intrinsic switching characteristics revealed here include the broadening of the switching time distribution with thinning, which is attributed to the nonuniform electric field caused by surface roughness.
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