Skip to content Skip to navigation

Academic Events

Report | Some interesting physics about p-n junction and related devices LEDs, laser diodes and solar cells

Some interesting physics about p-n junction and related devices LEDs, laser diodes and solar cells

 

YongHang Zhang

 

Professor

School of Electrical, Computer and Energy Engineering
 

Director

ASU Nanofab and Center for Photonics Innovation
 
Arizona State University
Tempe, AZ 85287 
Tel: 480-965-2562
Email: yhzhang@asu.edu   
Web Pages: http://asumbe.eas.asu.edu/
 
Abstract: Why can LEDs have a theoretical power conversion efficiency >100% but not lasers?  When can solar cells reach power conversion efficiency greater than 50%? These interesting questions about energy conversion for various kinds of p-n junction devices have been studied for more than half a century.  However, they still remain active research topics and have attracted even more attention recently.  This talk will first give a brief summary of the history about the research on these topics and then focus on our recent study of the electroluminescence refrigeration, laser diodes, solar cells. The topics range from a newly developed semi-analytical model for high-efficiency multi-junction solar cells to recent experimental results of our solar cells with record performance. In the end, the general trend of solar cell power generation and its market will also be discussed.