Development of graphene-metal film composite high-current carrying electrodes

Cooledge照明产品由在柔性印刷电路板（pcb）上制造的发光二极管（led）组成。pcb由铜（Cu）线层压在聚合物基板上组成。使用铜，因为它是直接的模式使用湿化学蚀刻和组件连接是直接使用完善的焊接技术。铜的缺点包括相对较高的成本，对非环保的湿化学蚀刻工艺的要求，以及相对较高的原型制作和定制制造成本。另一种方法是使用环保工艺打印导体。迄今为止，印刷导电油墨的载流能力比铜要小得多，这是由于油墨的体积导电性比大块金属低5倍，而且无法印刷厚的导电电极。****提出的项目研究石墨烯-金属薄膜复合材料的制备和表征。石墨烯的载流能力是铜的100万倍，具有超高的室温电子迁移率，导热系数高达> 3000 WmK-1，是其他材料无法比拟的。石墨烯的缺点是难以制备低成本、高电子质量的材料。石墨烯-金属薄膜复合材料将在1000级洁净室中制造，其特征是每厚度的薄片电阻和最大载流能力的函数。安达博士的团队和Cooledge Lighting的合作将为制备石墨烯-金属复合材料带来新的知识和先进的制造工艺技术，并培养出两名高素质的人才。长期目标是展示使用柔性石墨烯的高载流能力，这种能力可以超过单独的金属。低成本高载流电极的开发在更广泛的电子工业中具有潜在的应用前景。**

Cooledge Lighting products consist of light emitting diodes (LEDs) that are fabricated on flexible printed circuit boards (PCBs). The PCBs consist of copper (Cu) traces laminated to a polymeric substrate. Copper is used because it is straightforward to pattern using wet chemical etching and component attach is straightforward using well-established solder techniques. Disadvantages of Cu include relatively high cost, the requirement of non-environmentally friendly wet chemical etch processes and relatively high cost for prototyping and customized manufacturing. An alternate approach would be to print the conductors using an environmentally friendly process. To date, printed conductive inks have much less current-carrying capability than copper due to the 5x lower bulk conductivity of inks compared to bulk metal and the inability to print thick conductive electrodes. ****The proposed project investigates the fabrication and characterization of graphene-metal film composite materials. Graphene has many unique properties than exceed those of any other materials including having one million times current carrying capability than Cu, ultra-high room temperature electron mobility, and very high thermal conductivity of > 3000 WmK-1. The disadvantage of graphene is difficulty in preparing low-cost and high electronic quality material. Graphene-metal film composite materials will be fabricated in a class-1000 cleanroom, and characterized as a function of sheet resistance per thickness and maximum current carrying capability. The collaboration between Dr Adachi's team and Cooledge Lighting will lead to new knowledge and advanced manufacturing process techniques for preparing graphene-metal composite materials and result in training of two highly qualified personnel. The long-term goal is to demonstrate high current carrying capability using flexible graphene that can exceed that of the metal alone. The development of low-cost high current carrying electrodes has potential applications in the broader electronics industries. **