High Speed Picosecond Laser Scribing of Multilayer Thin Films in Solar Cell

本研究的目的是获得一个基本的理解有关的物理机制的高速皮秒激光划片的多层薄膜材料，并确定最佳的加工条件。 研究方法将包括基于物理的计算建模，以更好地了解物理过程和实验工作，以表征所得的形态，微观结构和电学特性。工艺参数和相关的物理机制，如光热和光机械反应之间的关系将被开发和最佳的工艺条件高速划片的多层薄膜材料将被确定。 这项工作的成功完成将提供科学的理解下的皮秒制度，高功率激光，等离子体的形成，以及它与用于太阳能电池的各种薄膜层的目标材料的相互作用的激光-材料的相互作用。 此外，这项工作将在薄膜电子制造中产生基础技术进步，如光伏器件，平板显示器，柔性电子和先进的半导体逻辑器件，从而将对这些领域的制造相关问题产生广泛的影响。 高频超短激光器具有从薄膜的脉冲激光制造到激光微/纳米制造的许多应用。 因此，提高对高频、超短激光与材料相互作用的理解可以显著提高皮秒激光的潜在应用。 该项目还将通过制造类、本科研究员项目和本科独立项目对本科教育产生积极影响。

The objective of this research project is to gain a fundamental understanding about the physical mechanisms of high speed picosecond laser scribing of multilayer thin film materials and determine optimal processing conditions. Research approaches will include both physics-based computational modeling to better understand the physical processes and an experimental work to characterize the resultant morphological, microstructural and electrical properties. The relationship between process parameters and associated physical mechanisms, such as photo-thermal and photo-mechanical reactions will be developed and optimal process conditions for high speed scribing of multilayer thin film materials will be identified. The successful completion of this work will provide a scientific understanding of the laser-material interaction under the picosecond regime, high power laser, plasma formation, and its interaction with the target material of various thin film layers used for solar cells. Furthermore, this work will produce fundamental technology advances in the manufacturing of thin film electronics, such as photovoltaic devices, flat panel displays, flexible electronics and advanced semiconductor logic devices and thus will bring a broad impact on manufacturing related issues on these areas. High frequency, ultrashort lasers have many applications from pulsed laser fabrication of thin films to laser micro/nano fabrication. Therefore, improving the understanding of high frequency, ultrashort laser-material interaction can significantly improve the potential applications of picosecond lasers. This project will also bring a positive impact on undergraduate education through the manufacturing classes, undergraduate research fellow programs and undergraduate independent projects.