新型功函数测量系统的建立及其应用研究

Establishment and Application of New Measurement System for Work Function

采用接触势差法,设计并组建了功函数测量系统。该系统由信号发生单元、振动单元和检测单元组成,信号发生单元输出低频正弦信号使参比电极振动,调节振动单元偏压使检测单元输出信号为零,通过计算加载偏压和标准参比电极的偏差可得样品功函数值。用该系统测量了UV处理对ITO功函数的影响,发现ITO功函数的提高存在极限值并可改善有机电致发光器件(OLED)的性能。该系统可在空气中快速、准确测量表面功函数。

Using the contact potential difference method, we have designed and established a measurement system for work function,which consists of three main parts such as,signal generation part, vibration part and detection part. The reference electrode is vibrated by a low frequency sine wave signal provided by signal generation part. When the output signal of de tection part is zero, by changing the load voltage of vibration part, we can get the work function of a sample by calclating the difference between the load voltage and the reference electrode. A change in the work function of ITO is observed when it is treated by UV ozone. The investigations indicate that the work function of ITO has a limiting value and the improvement in the work function of ITO can improve the performance of OLEDs. This system can measure the work function precisely accurately and quickly in atmosphere.