A High‐Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor
Abstract
Besides broadening of the absorption spectrum, modulating molecular energy levels, and other well‐studied properties, a stronger intramolecular electron push–pull effect also affords other advantages in nonfullerene acceptors. A strong push–pull effect improves the dipole moment of the wings in IT‐4F over IT‐M and results in a lower miscibility than IT‐M when blended with PBDB‐TF. This feature leads to higher domain purity in the PBDB‐TF:IT‐4F blend and makes a contribution to the better photovoltaic performance. Moreover, the strong push–pull effect also decreases the vibrational relaxation, which makes IT‐4F more promising than IT‐M in reducing the energetic loss of organic solar cells. Above all, a power conversion efficiency of 13.7% is recorded in PBDB‐TF:IT‐4F‐based devices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 13, 2018
- Source ID
- 10.1002/adma.201707170
Entities
People
- Harald Ade
- Huifeng Yao
- Jianhui Hou
- Long Ye
- Sunsun Li
- Wanning Li
Organizations
- Chinese Academy of Sciences
- National Natural Science Foundation of China
- North Carolina State University
- Office of Naval Research
- United States Department of Energy
- University of Chinese Academy of Sciences