PVDF薄膜的极化及其电性能研究.pdf

《PVDF薄膜的极化及其电性能研究.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、第41卷第3期电子科技大学学报Vol.41No.32012年5月JournalofUniversityofElectronicScienceandTechnologyofChinaMay2012·电子信息材料与器件·PVDF薄膜的极化及其电性能研究1122叶芸，郭太良，蒋亚东，黎威智(1.福州大学物理与信息工程学院福州350002;2.电子科技大学电子薄膜与集成器件国家重点实验室成都610054)【摘要】利用傅里叶红外光谱(FTIR)、示差扫描量热分析(DSC)、电滞回线和漏电流的分析，研究热极化和电晕极化对PVDF薄膜电性能的影响。结果表明，热极化和电晕极化

2、都可以提高PVDF薄膜的铁电性能，但是不同的极化温度、极化电场强度和极化时间使得PVDF薄膜具有不同的漏电流性能。在强电场作用下，热极化的温度更高，时间更长，偶极电荷的沿电场取向更完全，晶型向晶型的转变更彻底，因此剩余极化值、结晶度和晶型的含量均高于电晕极化后的薄膜。热极化中注入的空间电荷主要被PVDF的深阱俘获；而电晕极化过程中大量的空间电荷被聚合物材料的浅阱俘获。浅阱俘获的空间电荷稳定性要弱于深阱中的电荷，因此电晕极化的PVDF薄膜的漏电流需要更长的稳定时间。关键词电晕极化;铁电性能;漏电流;PVDF薄膜;热极化+中图分类号TQ342.712文献标识码

3、Adoi:10.3969/j.issn.1001-0548.2012.03.027InvestigationonPolingandElectricPropertiesofPVDFFilms1122YEYun,GUOTai-liang,JIANGYa-dong,andLIWei-zhi(1.CollegeofPhysicsandTelecommunicationEngineering,FuzhouUniversityFuzhou350002;2.StateKeyLaboratoryofElectronicThinFilmsandIntegratedDevices,

4、UniversityofElectronicScienceandTechnologyofChinaChengdu610054)AbstractInthispaper,theinfluenceofthermallypolingandcoronachargingonelectricpropertiesofPVDFfilmswasinvestigatedbyFouriertransforminfrared(FTIR),differentialscanningcalorimetry(DSC),ferroelectrichysteresisloopsandleakagec

5、urrentmeasurement.TheresultsshowedthattheferroelectricpropertiesofPVDFfilmswerebothimprovedbythermallypolingandcoronacharging,buttheleakagepropertiesofPVDFfilmsweredistinctduetodifferentpolingtemperatures,polingelectricfieldsandpolingtimes.Withtheeffectofhighelectricfieldathightemper

6、atureinthermallypoling,thedipoleswereorientedalongthedirectionofelectricfieldcompletely,whichcausedmorepolarcrystallinetransitedfromnon-polarαcrystalline.Soitwasfoundthatthecrystallinedegree,crystallinecontentandremanentpolarizationofthermallypoledPVDFfilmswerehigherthanthoseofcoro

7、nachargedPVDFfilms.Thereasonthatcausedleakagecurrentwasalsoanalyzed.ThespacechargesinjectedduringthepolingprocesswerestoredintheshallowtrapsofPVDFfilmsforcoronapolingandinthedeeptrapsforthermallypoling,respectively.Therefore,theleakagecurrentofcoronapoledPVDFwasunstablethanthatofther

8、mallypoledPV