Solar Cell Basics

This is how a solar cell works. The silicon wafer has an electron rich (n) layer and an electron poor (p or hole) layer. A photon of light energy is absorbed by the silicon semiconductor and if it has sufficient energy it forms an electron/hole pair or exciton. Under the right conditions the charges are separated and the free electron flows through the circuit creating an potential. Meanwhile another electron flows from the circuit back into the hole layer where it recombines with the original hole that was created.

 

The Washington Research Foundation has provided a six-year gift of $6.74 million to support nine new faculty hires, six postdoctoral researchers and the creation of a new experimental manufacturing facility on campus that will help move discoveries from the laboratory to the marketplace. This investment in the CEI is truly transformational.”
– Daniel Schwartz, CEI Director
“Providing clean energy to the inhabitants of our planet is a major challenge to future generations. The University of Washington is to be congratulated for establishing an Institute where faculty and students can work together to tackle the difficult global challenge of energy sustainability.”
– Mildred Dresselhaus, Professor of Physics and Electrical Engineering, Emerita and Institute Professor, Massachusetts Institute of Technology
“Energy competition is opening up in a variety of ways, the push for carbon control will continue, and the rate of technology advancement is exponential. All the things I’ve seen at the CEI are just perfect for the way we see things going in energy. You guys are at the cutting edge. We’re counting on you.”
– Ronald Litzinger, President, Edison Energy
Since its founding the Clean Energy Institute has contributed more than $1.1 million toward the education of 66 STEM scholars and recruitment of 12 students through our fellowship programs.