Efficient and Nonhalogenated Solvent-Processed Conjugated Donor–Acceptor Block Copolymer-Based Organic Solar Cells Containing the Same Benzodithiophene Unit
발표자
()
초록
내용
Conjugated block copolymers (CBCs) for organic solar cells (OSCs) have gained considerable attention due to their simple one-pot solution process. However, their power conversion efficiencies (PCEs) demand significant enhancement. In this work, we develop a new CBC (PBDB-T-b-PY5BDT) and demonstrate efficient and stable OSCs achieved by a halogen-free solution process. The molecular design alleviates unfavorable molecular interactions between the blocks at their interfaces. The PBDB-T-b-PY5BDT-based devices exhibit a high PCE (10.55%), and they show good mechanical, thermal, and storage stabilities. Importantly, we discuss the potential of our OSCs with two different control systems, including a binary polymer blend (PBDB-T:PY5BDT), and a conjugated random copolymer (CRC, PBDB-T-r-PY5BDT). We demonstrate that the photovoltaic performance, device stability, and mechanical robustness of the CBC-based OSCs exceed those of the binary all-polymer solar cells and CRC-based OSCs.