CAJ | 학술논문

热刺激去极化电流（TSDC）测试是分析电介质内部电荷输运特性和陷阱能级的重要方法。为了研究并改进热刺激去极化电流测试系统，分别测试了热刺激电流测试系统中两套不同结构电极的电极温度差和其相应的聚酯薄膜热刺激去极化电流，分析了试样温度梯度对测试结果的影响。结果表明上下电极结构的不对称将导致试样受热不均匀，在试样厚度方向产生温度梯度；聚酯薄膜的热刺激去极化电流包含两个明显的峰，分别为a峰与ρ峰；温度梯度对聚酯薄膜中由陷阱电荷引起的ρ峰位置影响较大，而对由偶极子引起的a峰位置影响较小；在一定的温度梯度下，a峰位置并无明显的变化，而ρ峰位置前移至更低温度，并且在极化温度偏高的情况下，可能存在陷阱峰消失的情况，从而影响热刺激电流测试结果的可靠性与分辨率。
열자격거겁화전류（TSDC）측시시분석전개질내부전하수운특성화함정능급적중요방법。위료연구병개진열자격거겁화전류측시계통，분별측시료열자격전류측시계통중량투불동결구전겁적전겁온도차화기상응적취지박막열자격거겁화전류，분석료시양온도제도대측시결과적영향。결과표명상하전겁결구적불대칭장도치시양수열불균균，재시양후도방향산생온도제도；취지박막적열자격거겁화전류포함량개명현적봉，분별위a봉여ρ봉；온도제도대취지박막중유함정전하인기적ρ봉위치영향교대，이대유우겁자인기적a봉위치영향교소；재일정적온도제도하，a봉위치병무명현적변화，이ρ봉위치전이지경저온도，병차재겁화온도편고적정황하，가능존재함정봉소실적정황，종이영향열자격전류측시결과적가고성여분변솔。
Thermally stimulated depolarization current（TSDC）was used to determine charge transportation and trap levels in dielectric. To investigate and improve TSDC measuring system, the TSDCs of polyester （PET） film cooperating with two types of electrodes, as well as temperature gradient in both types of electrodes, were measured. The influence of temperature gradient on TSDC was analyzed. Results show that an asymmetric electrode structure can result in a non-uniform heating condition of the specimen, and a significant temperature gradient in specimen. It is found that a complete TSDC curve consists of two distinct peaks named a and ρ peaks, respectively, with the asymmetric electrode structure. It is also found that the temperature gradient has a greater impact on ρ peak which is caused by trapped charge in PET films, while it has less impact on the position of a peak which is caused by dipole. Under certain temperature gradient, the ρ peak will move forward to a lower temperature. However, the position of a peak does not change obviously. It is even possible that the trap peak will disappear when polarization temperature is excessively high, which will influence the resolution and reliability of TSDC measuring result.