Fractal Silver Trees (image) University of California - Davis Caption Fractal silver structures grown by electrochemical reduction of silver nitrate on a fluorine doped tin oxide film. These structures could be the basis of a new type of solar cell. Credit Frank Osterloh, UC Davis Usage Restrictions May be used with credit. 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.