Thermal Properties of Small-Molecule Organic Semiconductors

*技术摘要*本项目将进行实验，以测量小分子有机半导体的导热系数和相关性质，这对包括薄膜晶体管和热电发电机在内的许多预期应用非常重要。虽然近几十年来已经制定了几条将电子性质和晶体结构联系起来的规则，但在理解热输运方面却并非如此；此外，传统的热导率测量技术通常不适用于许多有机晶体，因为这些晶体很小，热导率低且各向异性。PI和他的学生将使用一些静态和动态技术，其中一些是在这个项目中开发的，来测量与大多数设备相关的块状晶体和薄膜的热导率。其目的既是为了了解什么限制和控制热传导，也是为了筛选可能应用的材料。除了博士生，他们将在不同的实验技术方面获得丰富的经验，该项目将雇用本科教育专业的学生，他们将在做科学研究方面获得宝贵的经验，以便与未来的学生分享。*非技术摘要*本项目将继续进行实验，以测量小分子有机半导体的热(热)传导性和相关性质。这些材料正在被探索和开发用于许多应用，包括作为薄膜晶体管、太阳能电池和热电设备。对于晶体管和太阳能电池应用，重要的是材料具有足够高的导热系数，以便有效地带走在其运行中产生的热量。另一方面，对于热电应用，人们需要较低的导热系数，这样就可以很容易地在样品上建立温降。PI和他的学生将使用一些技术，其中一些是在这个项目中开发的，来测量选定材料的块状晶体和薄膜的导热系数，这些技术与许多应用相关。除了博士生，他们将在不同的实验技术方面获得丰富的经验，该项目将雇用本科教育专业的学生，他们将在科学研究方面获得宝贵的经验，并与未来的学生分享。

****Technical Abstract****This project will pursue experiments to measure thermal conductivities and related properties of small-molecule organic semiconductors, important for many anticipated applications including thin film transistors and thermoelectric power generators. Whereas several rules correlating electronic properties and crystal structures have been developed over recent decades, the same is not true about understanding thermal transport; in addition, traditional techniques for measuring thermal conductivity often don't work well for many organic crystals, for which crystals are small and thermal conductivities low and anisotropic. The PI and his students will use a number of static and dynamic techniques, some developed in this project, to measure thermal conductivities of bulk crystals and thin films, relevant for most devices. The aims are to both gain understanding of what limits and controls heat conduction and to screen materials for possible applications. In addition to Ph.D. students, who will gain extensive experience in different experimental techniques, the project will employ undergraduate education majors, who will gain valuable experience in doing scientific research which they can share with their future pupils.****Non-Technical Abstract****This project will pursue experiments to measure thermal (heat) conductivities and related properties of small-molecule organic semiconductors. These materials are being explored and developed for a number of applications, including as thin-film transistors, solar cells, and thermoelectric devices. For transistor and solar cell applications, it is important that the materials have sufficiently high thermal conductivities so that heat generated in their operation can be efficiently carried away. For thermoelectric applications, on the other hand, one desires a low thermal conductivity so that one can easily establish a temperature drop across the sample. The PI and his students will use a number of techniques, some developed in this project, to measure the thermal conductivities of both bulk crystals and thin films, relevant for many applications, of select materials. In addition to Ph.D. students, who will gain extensive experience in different experimental techniques, the project will employ undergraduate education majors, who will gain valuable experience in doing scientific research which they can share with their future pupils.