Zhong Z Y, Jiang Y D
Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China, Sichuan, Chengdu 610054, People's Republic of China.
J Colloid Interface Sci. 2006 Oct 15;302(2):613-9. doi: 10.1016/j.jcis.2006.07.009. Epub 2006 Aug 7.
In this work, we used different treatment methods (ultrasonic degreasing, hydrochloric acid treatment, and oxygen plasma) to modify the surfaces of indium-tin oxide (ITO) substrates for organic light-emitting devices. The surface properties of treated ITO substrates were studied by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), sheet resistance, contact angle, and surface energy measurements. Experimental results show that the ITO surface properties are closely related to the treatment methods, and the oxygen plasma is more efficient than the other treatments since it brings about smoother surfaces, lower sheet resistance, higher work function, and higher surface energy and polarity of the ITO substrate. Moreover, polymer light-emitting electrochemical cells (PLECs) with differently treated ITO substrates as device electrodes were fabricated and characterized. It is found that surface treatments of ITO substrates have a certain degree of influence upon the injection current, brightness, and efficiency, but hardly upon the turn-on voltages of current injection and light emission, which are in agreement with the measured optical energy gap of the electroluminescent polymer. The oxygen plasma treatment on the ITO substrate yields the best performance of PLECs, due to the improvement of interface formation and electrical contact of the ITO substrate with the polymer blend in the PLECs.
在本工作中，我们使用了不同的处理方法（超声脱脂、盐酸处理和氧等离子体）对用于有机发光器件的氧化铟锡（ITO）衬底表面进行改性。通过原子力显微镜（AFM）、X射线光电子能谱（XPS）、表面电阻、接触角和表面能测量等手段研究了处理后ITO衬底的表面性质。实验结果表明，ITO的表面性质与处理方法密切相关，氧等离子体处理比其他处理更有效，因为它能使ITO衬底表面更光滑、表面电阻更低、功函数更高、表面能和极性更高。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（PLEC）。结果发现，ITO衬底的表面处理对注入电流、亮度和效率有一定程度的影响，但对电流注入和发光的开启电压影响不大，这与所测电致发光聚合物的光学能隙一致。由于改善了ITO衬底与PLEC中聚合物共混物的界面形成和电接触，ITO衬底上的氧等离子体处理使PLEC表现出最佳性能。
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