Bifunctional Bis‐benzophenone as A Solid Additive for Non‐Fullerene Solar Cells
Abstract
Simultaneously improving efficiency and stability is critical for the commercial application of non‐fullerene acceptor polymer solar cells (NFA‐PSCs). Multifunctional solid additives have been considered as a potential route to tune the morphology of the active layer and optimize performance. In this work, photoinitiator bifunctional bis‐benzophenone (BP‐BP) is used as a solid additive, replacing solvent additives, in the PBDB‐T:ITIC NFA system. With the addition of BP‐BP, the intermolecular π–π stacking of PBDB‐T and morphology is improved, leading to more balanced carrier transport and more effective exciton dissociation. Devices fabricated with BP‐BP show a power conversion efficiency (PCE) of 11.89%, with enhanced short‐circuit current (Jsc), and fill factor (FF). Devices optimized with BP‐BP show excellent reproducibility, insensitivity to thickness, and an improved thermal stability under atmospheric conditions without encapsulation. This work provides a new strategy for the application of solid additives in NFA‐PSCs.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 25, 2020
- Source ID
- 10.1002/adfm.202008699
Entities
People
- Junsheng Yu
- Pu Fan
- Q. Hu
- Qing Zhang
- Thomas Paul Russell
- Wenjian Sun
- Xiaohua Zhang
- Yao Wu
Organizations
- Lawrence Berkeley National Laboratory
- National Natural Science Foundation of China
- Office of Naval Research
- Shanghai Jiao Tong University
- University of Electronic Science and Technology of China
- University of Massachusetts Amherst