【作者】 王耀；

【导师】 崔一平； 徐春祥；

【作者基本信息】 东南大学 ， 物理电子学， 2005， 硕士

【摘要】 有机半导体材料以其特有的优点,如成本低廉、生产过程简便等,对用其制作有机场效应管的研究方兴未艾。有机半导体材料种类繁多,但近年来,以并五苯为代表的有机小分子单晶材料的表现最为引人注目,用这种材料制作的有机场效应管在载流子迁移率及开关电流比等方面的性能已经可以和无定形硅场效应管相媲美。优化有机晶体的生长工艺是获得性能优良的场效应管的重要基础。本论文在对有机场效应管有源层材料生长工艺进行优化的基础上,用真空热蒸发的方法制备了有机半导体薄膜,研究了薄膜的光谱特性。我们以热氧化后的硅片为衬底,用真空蒸镀的方法制备了有机半导体材料并五苯薄膜,通过X射线衍射和原子力显微镜以及Raman光谱等手段对薄膜的生长、晶体结构及形貌等进行了分析,讨论了薄膜制备过程中的衬底温度对晶体生长的影响。并用飞行时间(TOF)法测试了并五苯薄膜的载流子漂移迁移率,发现其量级在10-3cm2/V·s左右,这证明我们制备的并五苯薄膜具有良好的性能。我们对并五苯薄膜的紫外-可见吸收谱和光致发光谱进行了测试,对不同条件下的并五苯薄膜的光谱进行比较,分析了谱峰的形成过程。并分析了在光谱中存在的Davydov分裂的原因。更多还原

【Abstract】 In recent years, organic semiconductor materials have attracted great interests and its performance has been improved drastically because of its low cost and simple processing. Though there are a lot of organic semiconductor materials, pentacene is one kind of the most important materials because of it’s high carrier mobilities and excellent crystalline quality. OFET fabricated by pentacene has a high mobility which can be compared with that of Amorphous silicon.Optimization of the organic crystal fabrication process is important to obtain high performance of organic semiconductor devices such as organic field-effect transistors (OFETs). In this paper, the thin-films of organic semiconductor pentacene were fabricated by thermal evaporation on silicon substrates coated with SiO2 layer by dry oxidation. X-ray diffraction (XRD) patterns, atomic force microscopic images and Raman scatter spectrum were employed to analyze the surface morphologies and crystal structures of the samples. The influences of different substrate temperatures on the crystallization were explored and the thin films with good crystal quality were obtained. By the measurement of time-of-flight (TOF), we obtained the estimated value of the charge carrier drift mobility(μ) which was about 10-3cm2V-1s-1.UV-Visible absorption spectrum and photoluminescence (PL) spectrum of pentacene film were also analyzed. We assigned the main reasons of the peaks of these two spectra, especially taking emphases on the influence of Davydov splitting.更多还原