Over 12% Efficiency Nonfullerene All‐Small‐Molecule Organic Solar Cells with Sequentially Evolved Multilength Scale Morphologies
Abstract
In this paper, two near‐infrared absorbing molecules are successfully incorporated into nonfullerene‐based small‐molecule organic solar cells (NFSM‐OSCs) to achieve a very high power conversion efficiency (PCE) of 12.08%. This is achieved by tuning the sequentially evolved crystalline morphology through combined solvent additive and solvent vapor annealing, which mainly work on ZnP‐TBO and 6TIC, respectively. It not only helps improve the crystallinity of the ZnP‐TBO and 6TIC blend, but also forms multilength scale morphology to enhance charge mobility and charge extraction. Moreover, it simultaneously reduces the nongeminate recombination by effective charge delocalization. The resultant device performance shows remarkably enhanced fill factor and Jsc. These result in a very respectable PCE, which is the highest among all NFSM‐OSCs and all small‐molecule binary solar cells reported so far.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 07, 2019
- Source ID
- 10.1002/adma.201807842
Entities
People
- Alex K.‐y. Jen
- Bin Kan
- Bo Xu
- Feng Liu
- Francis Lin
- Guofu Zhou
- Ke Gao
- Li Nian
- Lingling Shui
- Ming Zhang
- Qikun Rong
- Sae Byeok Jo
- Xiaobin Peng
- Xueliang Shi
- Yong Cao
- Yuanyuan Kan
Organizations
- City University of Hong Kong
- National Natural Science Foundation of China
- Office of Naval Research
- Shanghai Jiao Tong University
- South China University of Technology
- University of Washington