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加速实验中,参数退化模型描述了参数的退化规律,参数退化规律对应于器件退化机理,而退化机理又对应于内部的物理化学反应.因此,本文基于反应动力学中物理化学反应的温度效应速率模型及反应量浓度随时间的变化规律,研究并建立了GaN LED参数退化模型.本模型尝试从物理机理上解释参数退化过程中的退化规律,包括单调上升或单调下降退化规律、先上升后下降或先下降后上升等非单调退化规律,解决了实验后拟合方法不能建立非单调退化模型的问题.然后对GaN LED进行加速实验,确定模型参数.同时对GaN LED的退化规律进行分解,并且量化了GaN LED两种退化规律的退化比例及时间常数.
In the accelerated experiment, the parameter degradation model describes the degradation law of the parameters, the parameter degradation law corresponds to the device degradation mechanism, and the degradation mechanism corresponds to the internal physico-chemical reaction.Therefore, based on the temperature-response rate of physicochemical reaction in reaction kinetics Model and the variation of reaction concentration with time, a model of GaN LED parameter degradation has been studied and established.This model tries to explain the degradation law of parameter degradation process from the physical mechanism, including the monotonically increasing or monotonically decreasing degradation law, the first increase and then the decrease Or the first decline after the rise and other non-monotonous degradation of the law to solve the fitting method can not be established after the experiment non-monotonous degradation of the problem.Then the GaN LED accelerated experiments to determine the model parameters.At the same time, degradation of GaN LED degradation, and The degradation ratio and time constant of two degradation rules of GaN LED were quantified.