Device Structures (image) Ulsan National Institute of Science and Technology(UNIST) Share Print E-Mail Caption This shows: (a) Device structures, (b) J−V characteristics, and (c) EQE of PTB7:PC70BM-based PSCs with type I and type II architectures. Credit UNIST Usage Restrictions Academic use only. Reprint of this material is restricted. 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.