29.15% Efficiency Is the New World Record for a Tandem Solar Element (image) Kaunas University of Technology Share Print E-Mail Caption The tandem solar cell was realized on a typical laboratory scale of one square centimeter. However, scaling up is possible. Credit © Eike Köhnen/HZB Usage Restrictions Always credit the source Share Print E-Mail 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.