Skip over navigation

Events - Weekly

<<   April 2015   >>
Sunday, April 19
Monday, April 20
Tuesday, April 21
Wednesday, April 22
Seminar 4/22/2015 - Stephen Fonash, Penn State University: Light Trapping in nc-Si Solar Cell Structures
Abstract: Nano-scale light trapping structures offer a path to attaining maximum use of the photons impinging on a solar cell surface while minimizing the use of absorber material. The topography and morphology of  these devices plays a critical role in affecting light trapping and in determining the roles of the various light trapping mechanisms and their wavelength range of importance. In this discussion, these guiding ideas will be addressed in the context of nc-Si, an attractive absorber material with environmental, supply, absorption strength, and cost attributes.  Devices using nc-Si materials are shown to be used successfully in light trapping designs, and without significant absorber defects, in a process flow that yields nc-Si solar cells that make effective use of the photocurrents potentially available per area in ultrathin nc-Si cells.

Bio: Stephen J. Fonash holds the Bayard D. Kunkle Chair Emeritus in Engineering Sciences at the Pennsylvania State University and is Director Emeritus of the Penn State Center for Nanotechnology Education and Utilization (CNEU). Dr. Fonash’s research focuses on utilizing nanotechnology in energy conversion, biomedical processes, detectors, sensors, and thin film transistors. He has published over 300 papers in these areas along with three books. His book contributions have been in the area of photovoltaics with the last two being “Solar Cell Device Physics” (Elsevier, 2010) and “Introduction to Light Trapping in Solar Cell and Photo-detector Devices” (Elsevier, 2014). Prof. Fonash’s device transport computer modeling code AMPS (, developed with a number of his graduate students and post-docs, has been downloaded by over 3000 groups around the world for diode, solar cell and photo-detector device design and physical understanding as well as for graduate-level teaching purposes.

Prof. Fonash holds 32 patents, a number of which have been licensed by industry. He has consulted for a variety of firms and has co-founded two companies. Prof. Fonash is a Life Fellow of the Institute of Electrical and Electronics Engineers and a Fellow of the Electrochemical Society. He received his Ph.D. from the University of Pennsylvania.

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.
Bowen Hall Auditorium  ·  12:00 p.m. 1:00 p.m.
Thursday, April 23
Friday, April 24
Saturday, April 25