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提出一种有机半导体二极管电流电压关系的解析表达式.该表达式是基于Pasveer等人[Phys.Rev.Lett.94,206601(2005)]的迁移率模型建立的,其中考虑了影响有机半导体载流子输运最重要的因素,包括温度、载流子浓度和电场强度.将Pasveer等人迁移率公式中的栽流子浓度和电场强度用常数迁移率下严格解计算的平均值代入,然后将得到的迁移率取代Mott-Gurney电流电压关系中的常数迁移率从而得到解析电流电压表达式.将新解析表达式应用于三种材料制作的有机二极管,计算结果与实验数据符合很好,表明解析表达式是合理的.
An analytical expression for the current-voltage relationship of organic semiconductor diodes is proposed, which is based on the mobility model of Pasveer et al. [Phys. Rev. Lett. 94, 206601 (2005)], The most important factors of transport, including temperature, carrier concentration and electric field strength, are calculated by applying the average value of the exact solver calculated by the constant mobility under the mobility equation of Pasveer et al. The obtained mobility is substituted for the constant mobility in the Mott-Gurney current-voltage relationship to obtain the analytical current-voltage expression. The new analytical expression is applied to organic diodes fabricated from three materials, and the calculated results are in good agreement with the experimental data Parsing expressions is reasonable.