Thermal Characterization of Nanoengineered Chalcogenide Materials for Phase-Change Memory

0853350 Goodson该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。硫属化物相变（PC）材料由于其在高密度PC光记录和随机存取存储器（PCRAM）器件中的广泛应用而受到关注。这些装置的操作涉及温度和电势分布的复杂相互作用，其强烈地耦合到PC结晶动力学。这项研究将大大提高对PC纳米工程材料中纳米级热（和电荷）传输的理解深度。 该项目包括结晶动力学参数和传输特性的实验测量，如热导率，电阻率，塞贝克系数，熔点，热容和潜热。 实验结构将被集成到一个新的MicroThermal阶段，是能够真实的时间监测的全周期结晶过程中使用电阻和光学反射率测量，并配备了传统的规定，或原位透射电子显微镜（TEM）的研究。智力优势：寻求答案的问题，如但不限于：如何传输性能和结晶参数的影响超过数百万个完整的周期结晶过程？ 有没有可能在不影响电导率的情况下提高塞贝克系数？熔融温度和潜热如何受PC纳米颗粒尺寸分布的影响？ 新型微型仪器将使超快（超过1000万K/s）结晶动力学过程的研究成为可能。 纳米热量计将允许调查的熔融温度和潜热的PC材料的分辨率超过1 nJ。 更广泛的影响：这项研究增加了理解的阈值开关的起源，阈值电压和复位电阻的漂移，以及在PCRAM器件的故障机制。 因此，该研究可能导致识别具有显著增强的热电性能的纳米工程PC材料。除了涉及本科生和研究生的研究人员，传热可视化工具以前仅限于在先进的实验室使用，将被带到本科类的领域。现有的主要是理论传热（HT）课程将转换为动手互动体验。 将准备说明传热基本概念的HT演示教育视频，重点是传热可视化。他们将被张贴在YouTube上，我们将征求观众的反馈。随后，我们将与获奖的Silicon Run系列的制作人合作，以4个讲座视频系列的形式编辑最相关的内容，每个15分钟，以改善早期的YouTube帖子。

0853350Goodson This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Chalcogenide Phase Change (PC) materials are of interest due to their widespread application in high density PC optical recording and random access memory (PCRAM) devices. The operation of these devices involves a complex interaction of temperature and electrical potential distributions, which are strongly coupled to the PC crystallization kinetics. This research will substantially improve the depth of understanding of nanoscale heat (and charge) transport in PC nanoengineered materials. The project includes experimental measurements of the crystallization kinetics parameters and transport properties such as thermal conductivity, electrical resistivity, Seebeck coefficient, melting point, heat capacity, and latent heat. The experimental structures will be integrated into a novel MicroThermal Stage that is capable of real time monitoring of the full cycle crystallization process using electrical resistance and optical reflectivity measurements and equipped with provisions for conventional, or in situ Transmission Electron Microscopy (TEM) studies. Intellectual Merit: Answers are sought to questions such as but not limited to: How are the transport properties and crystallization parameters affected over millions of full cycle crystallization processes? Is it possible to increase the Seebeck coefficient without adversely affecting the electrical conductivity? How are the melting temperature and latent heat affected by the PC nanoparticle size distribution? Novel micro-instruments will enable study of ultrafast (over 10 million K/s) crystallization kinetics processes. A nanocalorimeter will allow investigation of melting temperatures and latent heats of PC materials with a resolution in excess of 1 nJ. Broader Impact: This research increases understanding of the origins of the threshold switching, drift in threshold voltage and reset resistance, and failure mechanisms in PCRAMs devices. Hence, the research may lead to identification of nanoengineered PC materials with substantially enhanced thermoelectric properties. In addition to involving undergraduate and graduate student researchers, heat transfer visualization tools previously limited to use in advanced laboratories, will be brought to the realm of the undergraduate class. The existing, mainly theoretical heat transfer (HT) course will be converted to a hands-on interactive experience. HT demonstration educational videos that illustrate the basic concepts of heat transfer will be prepared, with an emphasis on heat transfer visualization. They will be posted on YouTube, and we will solicit feedback from viewers. Subsequently, we will improve the early YouTube postings by compiling the most relevant contents in the form of 4 lectures video series, 15 minutes each, working with the producers of the award winning Silicon Run series.