基于单一类型载流子的电子倍增CCD倍增模型

摘要

基于单一类型载流子,讨论了电子倍增CCD(EMCCD)的雪崩倍增原理,并在此基础上使用经典分段电离率模型,结合雪崩倍增积分关系式建立了EMCCD的倍增模型.根据实际器件倍增结构和栅压幅值确定使用Wolff多次碰撞电离理论.通过倍增模型的理论计算与实际器件的倍增曲线比较发现边缘场强度足够大,倍增区足够宽才能引起适当的信号倍增.该模型可以方便地计算单一类型载流子信号通过全固态多级级联电子倍增寄存器后的总增益与倍增栅压的关系曲线.计算结果表明,倍增模型与现有EMCCD器件倍增数据吻合较好.%The avalanche multiplication principle of electron multiplying CCD (EMCCD) was discussed based on single type of carrier, and a multiplication model was built by using a classic piecewise ionization rate model and avalanche multiplication integral formula. Wolff's ionization rate model was selected according to the structure and the multiplication gate voltage amplitude of the actual devices. By comparing the theoretical result with the multiplication curve of the actual device, it can be found that only enough fringing field and multiplication area can lead to an adequate signal multiplication. The relationship between the multiplication gate voltage and the total gain of the cascaded boosting EMCCD can be determined by using the model. The calculation indicates that the actual device multiplication curve agreed well with the one of EMCCD theory model.