AI 中文总结
研究气相沉积有机薄膜共混物相分离中动力学效应，通过改变沉积速率结合PSD、RSoXS等分析方法，揭示沉积动力学对畴尺寸等的影响，为设计新型有机电子器件提供了基于沉积速率调控畴尺寸的策略。
AI 中文摘要
相分离有机薄膜共混物的特征长度尺度是决定有机电子器件性能和功能的关键结构参数。气相沉积有机薄膜的停滞形态源于沉积过程中热力学驱动力和动力学约束之间的相互作用。本文通过在恒定衬底温度下改变共沉积的N,N'-双(3-甲基苯基)-N,N'-二苯基联苯胺(TPD)和分散橙37(DO37)分子玻璃共混物的沉积速率，旨在分离动力学效应在相分离中的作用。利用原子力显微镜(AFM)图像的功率谱密度(PSD)分析量化形态对沉积速率的依赖性。表面上两个不同的与沉积速率相关的长度尺度揭示了沉积动力学如何直接影响畴尺寸和薄膜形貌。互补的共振软X射线散射(RSoXS)测量表明相分离贯穿整个薄膜厚度。这些观察结果与先前描述的均匀气相沉积薄膜的表面平衡机制一致，即增强的表面迁移率使生长薄膜中的分子在沉积过程中部分平衡成不同的表面模板状态。在当前工作中，这种机制使多组分共混物相分离并粗化成具有多个长度尺度的结构，然后在动力学上阻滞到一定程度，这取决于沉积速率。沉积速率对畴尺寸的精细调控证明为设计具有所需形貌的新型有机电子器件提供了策略。
英文摘要
The characteristic length scale of phase-separated organic thin film blends is a critical structural parameter governing the performance and functionality of organic electronic devices. The arrested morphologies of vapor-deposited organic thin films result from the interplay between thermodynamic driving forces and kinetic constraints during deposition. Here, we aim to isolate the role of kinetic effects in phase separation by varying the deposition rate at a constant substrate temperature for a co-deposited molecular glass blend of N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine (TPD) and Disperse Orange 37 (DO37). The dependence of morphology on deposition rate is quantified using power spectral density (PSD) analysis of atomic force microscopy (AFM) images. Two distinct deposition rate-dependent length scales at the surface reveal how deposition kinetics directly influence domain size and film topography. Complementary Resonant Soft X-ray Scattering (RSoXS) measurements indicate that phase separation extends throughout the film thickness. These observations are consistent with the surface equilibration mechanism previously described for homogeneous vapor-deposited films, in which enhanced surface mobility allows molecules in the growing film to partially equilibrate into distinct surface-templated states during deposition. In the current work, this mechanism allows the multi-component blend to phase separate and coarsen into a structure with multiple length scales before kinetically arresting to an extent that depends on the deposition rate. The demonstration of finely tunable domain size with deposition rate provides strategies to design new organic electronic devices with desired morphologies.
Comments22 pages, 7 figures
