铁电性
材料科学
锆钛酸铅
电介质
X射线光电子能谱
分析化学(期刊)
电容器
极化(电化学)
介电常数
薄膜
相(物质)
电极
矿物学
核磁共振
光电子学
化学
纳米技术
电压
电气工程
物理化学
物理
有机化学
色谱法
工程类
作者
Ibrahima Gueye,G. Le Rhun,O. Renault,F. Pierre,Emmanuel Defaÿ,N. Barrett
摘要
We present a study of the impact of Pb excess content on electrical performance of lead zirconate titanate (PbZr0.52Ti0.48O3, PZT) thin-film capacitors. High Pb excess eliminates the ZrOx interface layer between the PZT and the electrode but also reduces the breakdown field, while the linear dielectric character of the capacitor response increases with Pb excess. The chemical sensitivity of hard x-ray photoelectron spectroscopy with in situ bias provides direct evidence of a polar but the non-ferroelectric PbOx phase in the bulk of the sol-gel film. The phase has a distinct core level signature and is consistent with the dielectric response at low field, which becomes more ferroelectric at higher field, as well as the lower remanent polarization and breakdown field.
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