Changes in metallicity and electronic structure across the surface ferroelectric transition of ultrathin crystalline poly(vinylidene fluoride-trifluoroethylene) copolymers
Changes in metallicity and electronic structure across the surface ferroelectric transition of ultrathin crystalline poly(vinylidene fluoride-trifluoroethylene) copolymers
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DOI：
10.1103/physrevlett.80.1328
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发表时间：
1998-02-09
影响因子：
8.6
通讯作者：
Petukhova, N
中科院分区：
文献类型：
--
作者：
Choi, JW;Dowben, PA;Petukhova, N
由偏氟乙烯(70%)和三氟乙烯(30%)组成的共聚结晶薄膜在20℃左右发生表面铁电-顺电相变，伴随着电子结构和金属丰度的急剧变化。电子结构随温度的变化主要发生在导带。观察到这种P(VDF-TrFe70：30)材料类似于n型半导体，表面铁电转变处的电子结构变化类似于半导体到半金属的转变。
The surface ferroelectric-paraelectric phase transition in crystalline copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%), at about 20 degrees C, is accompanied by a dramatic change in both the electronic structure and metallicity. The temperature-dependent changes in the electronic structure occur primarily in the conduction band. This P(VDF-TrFE 70:30) material is observed to resemble an n-type semiconductor, and the change in electronic structure at the surface ferroelectric transition resembles a semiconductor-to-semimetal transition.