David Barbero, Umeå University (IMAGE) Umea University Caption Professor David Barbero, chemistry researcher at Umeå University in Sweden has, together with his research team, made a breakthrough involving organic semiconductors. Credit Mattias Pettersson, Umeå University. Usage Restrictions This photo may only be used in the context of this news release. 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.