电介质陷阱能量分布的光刺激放电法实验研究  

Experimental study on the distribution of trap levels in dielectric by photo-stimulated discharge

作　　者：朱智恩[1] 张冶文[1] 安振连[1] 郑飞虎[1] 

机构地区：[1]同济大学波耳固体物理研究所,上海200092

出　　处：《物理学报》2010年第7期5067-5072,共6页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:50537040);国家自然科学基金(批准号:50807040);上海市科学技术委员会(批准号:07DZ22302)资助的课题~~

摘　　要：利用光刺激放电方法研究了线性低密度聚乙烯(LLDPE)中的陷阱能级分布,分别介绍了连续扫描与分段扫描这两种扫描方式并对它们进行了对比.指出在通常使用的连续扫描过程中,光刺激脱阱的不彻底给实验数据带来了一定的误差,着重讲述了分段扫描的理论基础以及实验过程.实验结果表明:单一波长辐照下的光刺激衰减电流的对数与时间成线性关系,它和分段扫描方法中的理论分析完全符合,同时也验证了在本实验中忽略载流子的重俘获过程是合理的;LLDPE中的俘获电荷位于4.14—6.22eV的陷阱能带内,但它们主要集中在陷阱能级为4.78—5.18eV的窄陷阱能带内.The distribution of trap levels in the low density polyethylene（LDPE） was studied by means of photo-stimulated discharge（PSD）.And two scanning modes,continuous scanning and step scanning,were discussed.It was pointed out that there may be some problems because of the incomplete detrapping of the trapping charges for the continuous scanning.The principle and the experimental process for the step scanning were presented.It is found that there is a linear relationship between the logarithm of PSD current produced under the irradiation of the monochromatic light and the time,which is in accordance with the theoretical analysis and indicates that the retrapping effect of the carriers can be neglected.The charges are trapped in the levels of 4.36—6.22 eV in LDPE,the main part of which were trapped in the energy levels of 4.78—5.18 eV.

关 键 词：光刺激放电 陷阱能级分布 衰减电流 

分 类 号：O481.1[理学—固体物理]