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Surface modifications of ITO electrodes for polymer light-emitting devices

机译：用于聚合物发光器件的ITO电极的表面改性

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Surface modifications were performed on the indium tin oxide (ITO) substrates for polymer light-emitting devices, using the different treatment methods including solvent cleaning, hydrochloric acid treatment and oxygen plasma. The influence of modifications on the surface properties of ITO electrodes were investigated by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), contact angle, and four-point probe. The surface energies of the ITO substrates were also calculated from the measured contact angles. Experimental results demonstrate that the surface properties of the ITO substrates strongly depend on the modification methods, and oxygen plasma more effectively improves the ITO surface properties compared with the other treatments. Furthermore, the polymer light-emitting electrochemical cells (LECs) with the differently treated ITO substrates as device electrodes were fabricated and characterized. It is observed that the surface modifications on ITO electrodes have a certain degree of influence upon the injection current, luminance and efficiency, but hardly upon the turn-on voltages of current injection and light emission which are close to the measured energy gap of electroluminescent polymer. Oxygen plasma treatment on the ITO electrode yields the better performance of the LECs, due to the improvement of interface formation and electrical contact of the ITO electrode with the polymer blend in the LECs. (c) 2006 Elsevier B.V. All rights reserved.
机译：使用包括溶剂清洁，盐酸处理和氧等离子体的不同处理方法，在用于聚合物发光器件的铟锡氧化物（ITO）基板上进行了表面改性。通过X射线光电子能谱（XPS），原子力显微镜（AFM），接触角和四点探针研究了修饰对ITO电极表面性能的影响。 ITO衬底的表面能也由测得的接触角计算得出。实验结果表明，ITO基板的表面性能在很大程度上取决于改性方法，与其他处理相比，氧等离子体可以更有效地改善ITO表面性能。此外，制备并表征了以不同处理的ITO衬底作为器件电极的聚合物发光电化学电池（LEC）。可以看出，ITO电极上的表面改性对注入电流，亮度和效率有一定程度的影响，但几乎不影响电流注入和发光的开启电压，这些电压接近电致发光聚合物的测量能隙。 ITO电极上的氧等离子体处理可改善LEC的性能，这是由于界面形成以及ITO电极与LEC中的聚合物共混物之间的电接触得到了改善。 （c）2006 Elsevier B.V.保留所有权利。

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