Rational Tuning of Molecular Interaction and Energy Level Alignment Enables High‐Performance Organic Photovoltaics
Abstract
The performance of organic photovoltaics (OPVs) has rapidly improved over the past years. Recent work in material design has primarily focused on developing near‐infrared nonfullerene acceptors with broadening absorption that pair with commercialized donor polymers; in the meanwhile, the influence of the morphology of the blend film and the energy level alignment on the efficiency of charge separation needs to be synthetically considered. Herein, the selection rule of the donor/acceptor blend is demonstrated by rationally considering the molecular interaction and energy level alignment, and highly efficient OPV devices using both‐fluorinated or both‐nonfluorinated donor/acceptor blends are realized. With the enlarged absorption, ideal morphology, and efficient charge transfer, the devices based on the PBDB‐T‐F/Y1‐4F blend and PBDB‐T‐F/Y6 exhibit champion power conversion efficiencies as high as 14.8% and 15.9%, respectively.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 09, 2019
- Source ID
- 10.1002/adma.201904215
Entities
People
- Chenhui Zhu
- Chunfeng Zhang
- Dong Meng
- Guangchao Han
- Hao‐cheng Wang
- Jingjing Xue
- Jun Yuan
- Kung‐hwa Wei
- Pei Cheng
- Rui Wang
- Tianyi Huang
- Wenchao Huang
- Yang Yang
- Yingping Zou
- Yuanping Yi
Organizations
- Air Force Office of Scientific Research
- Central South University
- Lawrence Berkeley National Laboratory
- Nanjing University
- National Chiao Tung University
- National Natural Science Foundation of China
- Office of Naval Research
- Royal Institute of Chemistry
- University of California, Los Angeles