通过物理气相沉积制备的有机半导体高密度双组分玻璃
High density two-component glasses of organic semiconductors prepared by physical vapor deposition
AI总结：
研究多组分气相沉积有机半导体玻璃特性，用光谱椭偏仪表征共沉积的NPD和TPD玻璃，发现其形成高密度、热稳定性增强的玻璃，密度和稳定性与衬底温度有关，转变从自由表面开始，为表面平衡机制研究提供依据。
AI中文摘要：
物理气相沉积（PVD）因其能形成具有优异性能的薄层而被广泛用于生产有机半导体器件。尽管器件中的层通常由两种或更多种组分组成，但对于这种多组分气相沉积玻璃的基本特性了解有限。本文采用光谱椭偏仪表征了共气相沉积的NPD和TPD玻璃在整个成分范围内的密度、热稳定性和光学性能。发现共沉积的NPD和TPD形成了具有增强热稳定性的高密度玻璃。密度和稳定性对衬底温度的依赖性相关，共沉积玻璃的双折射由混合物降低的衬底温度决定。此外，观察到高稳定性和高密度双组分玻璃向过冷液体的转变从自由表面开始并以恒定速度向体相传播，这与表面平衡机制一致。
英文摘要：
Physical Vapor Deposition (PVD) is widely utilized for the production of organic semiconductor devices due to its ability to form thin layers with exceptional properties. Although the layers in the device usually consist of two or more components, there is limited understanding about the fundamental characteristics of such multi-component vapor-deposited glasses. Here, spectroscopic ellipsometry was employed to characterize the densities, thermal stabilities and optical properties of co-vapor deposited NPD and TPD glasses across the entire range of composition. We find that co-deposited NPD and TPD form high density glasses with enhanced thermal stability. The dependences of density and stability upon substrate temperature are correlated, and the birefringence of the co-deposited glasses is determined by the reduced substrate temperature of mixtures. Additionally, we observe that the transformation of a highly stable and dense two component glass into its supercooled liquid initiates from the free surface and propagates into the bulk at constant velocity, like single component PVD glasses. All these features are consistent with the surface equilibration mechanism.
