基于电场力显微镜的有机小分子电荷捕获材料存储特性及其机制研究

发布时间：2018-03-05 22:20

本文选题：有机小分子材料　切入点：电荷捕获　出处：《南京邮电大学》2017年硕士论文　论文类型：学位论文

【摘要】：有机小分子材料具有柔性、易于裁减、绿色加工、生产成本低的优点,近年来被广泛应用于有机电子器件领域,其中之一就是作为有机存储器件的电荷捕获层。作为下一代高密度存储器的候选者,电荷捕获型存储器一直是相关基础研究和产业开发的重点,电荷在捕获层中的存储位置、空间分布情况直接影响到器件的编写、擦除和保持能力,是决定器件实际性能的重要因素。为了深入认识该类材料的电学特性,进一步挖掘材料的光电属性从而改善器件的性能,我们在微纳尺度上对材料的电学特性展开研究。近年来,静电场力显微镜(EFM)与开尔文扫描探针显微镜(KPFM)以其广泛适用各类材料以及高分辨率的优势,在电学领域的研究中脱颖而出。我们的工作利用EFM与KPFM对有机小分子薄膜材料展开研究,得到了有关材料的电学特性,具体包括:(1)对位阻型有机小分子材料DSFXPY薄膜捕获电荷的注入、存储能力展开定性定量分析,对不同厚度DSFXPY薄膜的存储性能进行对比分析,发现DSFXPY薄膜中无明显横向扩散属性,且薄膜中空穴的保持性能优于电子的保持性能;(2)对位阻型有机小分子材料SFDBAO与PS共混膜捕获电荷的注入、存储展开定性定量分析,对不同掺杂浓度的PS/SFDBAO共混膜存储性能进行对比分析,发现SFDBAO与PS共混后可以大幅提升空穴的存储密度与保持能力,PS/SFDBAO共混膜中无明显横向扩散属性,PS/SFDBAO-10%薄膜有最优的空穴保持性能;(3)对n型有机小分子C_(60)与PS共混膜捕获电荷注入、存储展开定性定量展开分析,对不同掺杂浓度的PS/C_(60)共混膜存储性能对比分析,发现PS/C_(60)-15%薄膜有最优的保持性能。此外,还着重分析了薄膜中捕获电荷的扩散、擦除机制,发现PS/C_(60)共混膜中捕获的电子更易被擦除;PS/C_(60)共混膜中虽然同时存在横向扩散与纵向扩散,但纵向扩散才是电荷扩散的主导机制。我们的研究工作证明DSFXPY与PS/SFDBAO共混膜都具有良好的电荷局域能力以及保持能力,是有望应用于高密度有机存储器件的理想材料,而PS/C_(60)共混膜则拥有纵向扩散为主导的电学特性。随着有机材料微纳尺度电学性能更深层次研究,我们相信有机小分子薄膜材料也将进一步展现出自身独特的物理特性,在有机电子学领域得到充分的应用。
[Abstract]:Organic small molecular materials have the advantages of flexibility, easy reduction, green processing and low production cost, so they have been widely used in the field of organic electronic devices in recent years. As a candidate for the next generation of high density memory, charge capture memory has always been the focus of basic research and industrial development, and the storage location of charge in the capture layer. The spatial distribution directly affects the device preparation, erasure and retention ability, which is an important factor to determine the actual performance of the device. Further excavating the optoelectronic properties of materials to improve the performance of devices, we have studied the electrical properties of materials at the micro- and nanoscale scale. Electrostatic Field Force microscope (EFM) and Kelvin scanning probe microscope (KPFM) have the advantages of wide application of various materials and high resolution. Our work uses EFM and KPFM to study the organic small molecule thin film materials, and obtains the electrical properties of the related materials. It includes: 1) injection of trapping charge, qualitative and quantitative analysis of storage capacity of DSFXPY thin film, and comparison and analysis of storage properties of DSFXPY thin films with different thickness. It is found that there is no obvious transverse diffusion property in DSFXPY thin films. The hole retention performance of the film is better than that of electron retention. It can be used to inject the trapping charge of the SFDBAO / PS blend film, and to develop the qualitative and quantitative analysis of the storage. The storage performance of PS/SFDBAO blend films with different doping concentrations was compared and analyzed. It was found that the storage density and retention capacity of PS / PS blends could be greatly enhanced by SFDBAO / SFDBAO blend. There was no obvious transverse diffusion property in PSP / SFDBAO-10% films. PS/ SFDBAO-10% films had the best hole retention performance. The qualitative and quantitative analysis of storage expansion and the comparative analysis of storage performance of PS / C / C _ (60) / P / C _ (60) / S / C _ (60) / C _ (60) / C _ (60) / C _ (60) / C _ (60) / C _ (60) / C _ (60) / C _ (60) / C _ (60) / C _ (60) / C _ (60) / C _ (. It was found that the electrons trapped in the PS/ CST60) blend membrane were more easily erased, although there were both transverse and longitudinal diffusions in the blend film. But the longitudinal diffusion is the dominant mechanism of charge diffusion. Our work has proved that the DSFXPY / PS/SFDBAO blend film has good charge localization and retention ability, and is an ideal material for high density organic memory devices. And the PS / C / C / C 60) blend film has a longitudinal diffusion-dominated electrical property. With the deeper study of the micro- and nanoscale electrical properties of organic materials, we believe that the organic small molecular thin films will further exhibit their own unique physical properties. It has been fully applied in the field of organic electronics.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP333;TB383.2

【参考文献】