Triperylene Hexaimides Based All-Small-Molecule Solar Cells with an Efficiency over 6% and Open Circuit Voltage of 1.04 V

Bulk-heterojunction (BHJ) organic solar cells (OSC) containing a p-type electron donor and an n-type acceptor material have caught the attention of researchers. Numerous research have been dedicated to the design and synthesis of novel donors and acceptors as the performance of OSC depends highly on the absorption ability energy levels and the charge transfer mobility of the donor and acceptor materials. A perylene diimide derivative with 3D rylene architecture as electron acceptor was adopted and systematically studied the effect of thermal annealing (TA) treatment on the BHJ morphology molecular packing and orientation in the BHJ active layers. Results show that the acceptor molecules triperylene hexaimides (TPH) greatly affects the molecular packing of donor DRCN5T and TA treatment has a great influence on the BHJ morphology enhancing the power conversion efficiency of DRCN5T:TPH based OSC from 0.47% to 6.16% with an open circuit voltage of 1.04 V.