Solar Cell (IMAGE) Penn State Caption The concentrating photovoltaic system showing the top lenslet; the little black square visible near the middle is the solar cell and the lines running away from it are the contact wires. Credit Giebink Lab, Penn State Usage Restrictions non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.