有机小分子电荷捕获材料及其晶体管存储器中电荷陷阱可视化表征与机制研究

Charge trapping memory is regarded as a promising new generation of nonvolatile memory devices. Sterically hindered organic small molecule material has showed great application potential since its advantages of high thermal stability, nice electronic structure, and can be synthesized with low cost. However, the storage mechanism based on this material is still unclear, the electrostatic force microscopy (EFM) and scanning kelvin probe microscopy (KPFM) are adopted in this project to do an study on the sterically hindered organic small molecule film and relative memory devices. Our job is aimed at constructing the relationship between the charge trapping properties and their molecular structure, the properties of the sample, and experimental environment, and improving the analytical method for the images of the trapped charges. As a result, provide theoretical and experimental guidance for the preparation of more stable and efficient storage devices, guide the direction of molecular design, filter non-volatile organic small molecule charge trapping materials with high storage density, fast response speed, long service life, can read and write repeatedly.

继纳米浮栅型存储器之后，电荷捕获型存储器被认为是一种极具应用前景的新一代非易失性存储器。位阻型有机小分子材料由于具有较高的热稳定性、电子结构可调、低成本的制备方法等优势，使其在新一代非易失性电荷捕获型存储器件中显示出了巨大的应用潜力。然而，基于该类材料的存储器件存储机制来源仍不清楚，本项目将采用静电力扫描探针显微镜(KPFM/EFM)表征技术对位阻型有机小分子材料及相关存储器件的电荷捕获动力学过程及机制开展研究，构建分子结构特点、样品特性、实验环境与小分子材料的电荷捕获、扩散及保持特性的关系；建立分子结构与存储器存储性能参数关系,为制备更加稳定，高效的存储器件提供理论和实验指导，指导分子设计方向；筛选一批具有高的存储密度、快的响应速度、长的使用寿命、可以反复读写的非易失性有机小分子电荷捕获材料；完善基于静电力扫描探针显微镜的材料捕获电荷可视化测量与分析方法。

电荷捕获存储器作为下一代高密度存储器的候选者,备受微电子领域相关基础研究和产业开发领域的关注。有机小分子材料由于具有较高的热稳定性、电子结构可调、低成本的制备方法等优势，使其在新一代非易失性电荷捕获型存储器件中显示出了巨大的应用潜力。然而，基于该类材料的存储器件存储机制来源仍不清楚，本项目采用静电力扫描探针显微镜(KPFM/EFM)表征技术对有机小分子材料复合驻极体薄膜的电荷捕获动力学过程及机制进行了研究，探究了电荷注入方式、注入时间电压等实验参数，样品形貌、厚度等样品特性，以及样品保存环境等外部实验条件对该类复合材料的电荷捕获、扩散及保持特性的影响；发现了PS/CNSFX, PS/DCNSFX等具有优异电荷捕获特性的材料，并在非易失性存储器件中得到了应用，为制备更加稳定，高效的存储器件提供了理论和实验基础；完善了基于静电力扫描探针显微镜的材料捕获电荷可视化测量与分析方法，讨论了该类材料电荷捕获特性可能的机制。