Institute of Acoustics, Chinese Academy of Sciences, Bei-Si-Huan-Xi Road 21, Beijing 100190, People's Republic of China.
J Phys Condens Matter. 2010 Jul 7;22(26):262001. doi: 10.1088/0953-8984/22/26/262001. Epub 2010 May 24.
The growth of pentacene thin films at elevated temperatures was studied. We observed decreased grain size and crystallinity with increasing substrate temperature in 30 nm films, despite the increased grain size of the submonolayer films. These were attributed to a two-dimensional to three-dimensional growth transition and a pronounced desorption of the first monolayer molecules. The observed coarsening-like behavior and the dendritic to compact grain geometry transition with temperature were explained by classic growth theories. A modified bimodal growth mechanism at elevated temperatures was proposed by analyzing both the out-of-plane and the in-plane grazing incidence x-ray diffraction patterns of the same films.
高温下并五苯薄膜的生长研究。我们观察到在 30nm 薄膜中，尽管亚单层薄膜的晶粒尺寸增加，但随着衬底温度的升高，晶粒尺寸和结晶度降低。这归因于二维到三维的生长转变和第一层分子的显著解吸。通过经典生长理论解释了与温度相关的类似粗化行为和枝晶到致密晶粒几何形状的转变。通过分析相同薄膜的面外和平面掠入射 X 射线衍射图案，提出了在高温下的改进的双峰生长机制。
