Professor Alex Jen (IMAGE) City University of Hong Kong Caption Professor Alex Jen (center) and his research team: Dr Francis Lin (left) and Mr Jiang Kui (right). Professor Jen presents a prototype of the printable perovskite solar cells. Credit City University of Hong Kong Usage Restrictions Image must be used with appropriate caption and credit. License Original 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.