Growth dynamics of pentacene thin films
Growth dynamics of pentacene thin films
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DOI：
10.1038/35087532
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发表时间：
2001-08-02
期刊：
影响因子：
64.8
通讯作者：
Tromp, RM
中科院分区：
文献类型：
--
作者：
Heringdorf, FJMZ;Reuter, MC;Tromp, RM
最近单晶有机光电子器件的演示受到了广泛的关注（1-4）。但是这种器件的实际应用需要使用沉积在各种各样的衬底上的廉价有机膜。不幸的是，这些有机薄膜的物理性质不能与单晶材料的物理性质相比。此外，有机薄膜生长和结晶的基本物理原理还没有得到很好的理解。在这里，我们报告的并五苯薄膜的演变原位研究，利用光电子发射显微镜的实时成像能力。通过仔细的衬底制备和表面能控制相结合，我们成功地生长出单晶晶粒尺寸接近0.1毫米的薄膜（比以前大20-100倍），这些薄膜大到足以完全容纳一个完整的器件。我们认为有机薄膜的生长与无机材料的外延生长非常相似，我们期望为这些无机系统开发的策略和概念将为分子薄膜器件的进一步开发和优化提供指导。
The recent demonstration of single-crystal organic optoelectronic devices has received widespread attention(1-4). But practical applications of such devices require the use of inexpensive organic films deposited on a wide variety of substrates. Unfortunately, the physical properties of these organic thin films do not compare favourably to those of single-crystal materials. Moreover, the basic physical principles governing organic thin-film growth and crystallization are not well understood. Here we report an in situ study of the evolution of pentacene thin films, utilizing the real-time imaging capabilities of photoelectron emission microscopy. By a combination of careful substrate preparation and surface energy control, we succeed in growing thin films with single-crystal grain sizes approaching 0.1 millimetre (a factor of 20-100 larger than previously achieved), which are large enough to fully contain a complete device. We rnd that organic thin-film growth closely mimics epitaxial growth of inorganic materials, and we expect that strategies and concepts developed for these inorganic systems will provide guidance for the further development and optimization of molecular thin-film devices.