EAGER: Enhanced Optoelectronic Devices Through Integration of Single-Crystal Graphene and Bernal Bilayer and Trilayer Graphene

本研究的目的是在中红外半导体激光器顶部采用石墨烯透明电接触，以确定严格限制高温操作的基本物理机制。 该方法是使用锑基半导体激光器作为平台来测试单层和少层石墨烯的光学透明度，导电性和散热效率。 无论是多域和单晶石墨烯单层将进行比较，以及双层和三层与非Bernal和Bernal AB stacking.The能力石墨烯将提供同时光泵和电偏置激光器件将使载流子浓度的精确测量阈值以上，以提高这些有前途的3？100 K以上的5 µm器件。 除了石墨烯的高光学透射率和优异的电学性质可以导致中红外发射器的更低阈值，更高的输出功率和更高的工作温度之外，石墨烯还表现出优异的散热潜力，这将被研究并与其作为一般电子设备中的单原子厚度散热器的潜力相关。薄，具有高迁移率和优异散热的透明接触可在光电子器件中具有广泛的应用，所述光电子器件包括发光二极管、激光器、晶体管和需要良好热管理同时使散热层的尺寸最小化的其它器件。 中红外设备的重要应用包括环境监测、对抗措施和自由空间通信。 PI将继续让女性，高中生和本科生参与研究，并接触K-12学生和教师。

The objective of this research is to employ graphene transparent electrical contacts atop mid-infrared semiconductor lasers to determine the fundamental physical mechanisms that critically limit high-temperature operation. The approach is to use antimonide-based semiconductor lasers as the platform to test optical transparency, electrical conductivity, and the heat dissipation efficacy of single and few-layer graphene. Both multi-domain and single-crystal graphene monolayers will be compared as well as bilayers and trilayers with non-Bernal and Bernal AB stacking.The capability graphene will provide to simultaneously optically pump and electrically bias laser devices will enable precise measurements of carrier concentrations above threshold in order to elevate the characteristic temperature of these promising 3?5 µm devices above 100 K. In addition to the high optical transmission and excellent electrical properties of graphene that could lead to lower thresholds, higher output powers, and higher operating temperatures in mid-infrared emitters, graphene has demonstrated excellent potential for heat dissipation, which will be studied and related to its potential as a single-atom-thick heat dissipater in electronic devices in general.Thin, transparent contacts with high mobility and excellent heat dissipation may have extensive applications in optoelectronic devices, including light emitting diodes, lasers, transistors, and other devices that require good thermal management while minimizing the size of the heat dissipating layer. Important applications of mid-infrared devices include environmental monitoring, countermeasures, and free space communications. The PIs will continue to involve women, high school students, and undergraduates in the research and to reach out to K-12 students and teachers.