简介: |
【Abstract】Roll to roll processing of thin film has been one of the most promising and challenging technologies for industries, such solar cells, LED, and TFT, etc. The primary barriers are cost and quality. For example in thin film solar cells, to have a chance at large-scale success one needs (i) the highest possible efficiencies and (ii) to reduce manufacturing costs of the active elements of thin film solar-cell modules. In addition, scalable 3D patterned thin film structures are needed for unique physical properties. For example, 3D thin film structures could be used as a strong light absorbent or concentrators. However, the current thin film processing is limited by high temperature, non-selective and high cost. There is a critical need for fast, selective, room temperature and low cost thin film processing techniques.
This talk will discuss the process mechanisms of a few industry-transforming new processes which promise to solve most of these problems simultaneously. 1) Roll to roll speed laser crystallization for thin film from nanoparticles. Thin film processing on flexible substrates will be discussed. 2) From 1D to 2D/3D thin film structures by laser dynamic forming, which has advantages of good micro/nanoscale formability, flexibility in wide range of materials, and scalability with parallel processing.
【Bio】 Gary J. Cheng received a B.S. and M.S. in Materials Science from University of Science and Technology Beijing, China, and a Ph.D. from Columbia University in Mechanical Engineering in 2002. He is an Associate Professor in School of Industrial Engineering at Purdue University. He began his academic career as an assistant professor in the School of Mechanical and Materials Engineering at Washington State University in 2002, and joined Purdue University in 2007. His research focuses on laser materials processing, micro/nano manufacturing, bulk manufacturing of micro/nano 3D structures, mechanical/physical property enhancement of materials, renewable energy. He received the Young Investigator Award from the Office of Naval Research (ONR) in 2007 and the CAREER Award from the National Science Foundation (NSF) in 2006. He received Outstanding Young Manufacturing Engineer award from the Society of Manufacturing Engineer (SME) in 2007. He has published about 50 Journal articles and more than 30 peer reviewed conference papers. |
