Université de Toulouse, UPS, INPT, LAPLACE (Laboratoire Plasma et Conversion d'Energie), 118 route de Narbonne, F-31062 Toulouse cedex 9, France.
Langmuir. 2011 Apr 5;27(7):3611-7. doi: 10.1021/la104760a. Epub 2011 Mar 10.
For a lab-on-chip application, we fabricate a blue bottom emitting strong microcavity organic light emitting diode (OLED), using very smooth and optically thin (25 nm) silver film as anode on a glass substrate. To improve the hole injection in the OLED device, PEDOT-PSS (poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid)) has been used, so the silver anode must present not only a very smooth surface but also a strong adherence on the glass and a high wettability to allow a good PEDOT-PSS spin coating deposition. To obtain these physical properties, different 5 nm thick nucleation layers (germanium, chromium, and hydrogenated amorphous carbon) have been used to grow the silver thin films by e-beam deposition. The Ge/Ag bilayer presents all the desired properties: this bilayer, investigated by ellipsometry, optical profilometry, contact angle measurements, and XPS analysis, highlights an ultrasmooth surface correlated with the film growth mode and a high wettability related to its surface chemical composition.
对于一个芯片实验室应用，我们使用非常光滑和光学薄（25nm）的银膜作为玻璃基底上的阳极，制造了一个蓝色底部发射的强微腔有机发光二极管（OLED）。为了改善 OLED 器件中的空穴注入，使用了PEDOT-PSS（聚（3,4-乙撑二氧噻吩）-聚（苯乙烯磺酸）），因此银阳极不仅必须具有非常光滑的表面，而且必须在玻璃上具有很强的附着力，并且具有高润湿性，以允许良好的 PEDOT-PSS 旋涂沉积。为了获得这些物理性质，使用了不同的 5nm 厚的成核层（锗、铬和氢化非晶碳）通过电子束沉积来生长银薄膜。Ge/Ag 双层膜具有所有所需的性质：通过椭圆偏振法、光学轮廓仪、接触角测量和 XPS 分析研究了这种双层膜，它具有与膜生长模式相关的超光滑表面和与表面化学成分相关的高润湿性。
