Improvement of Photovoltaic Performance of Polymer Solar Cells by Rational Molecular Optimization of Organic Molecule Acceptors
Abstract
Two n‐type organic semiconductor (n‐OS) small molecules m‐ITIC‐2F and m‐ITIC‐4F with fluorinated 2‐(2,3‐dihydro‐3‐oxo‐1H‐inden‐1‐ylidene)propanedinitrile (IC) terminal moieties are prepared, for the application as an acceptor in polymer solar cells (PSCs), to further improve the photovoltaic performance of the n‐OS acceptor 3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene) indanone) ‐5,5,11,11‐tetrakis(3‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d′]‐sindaceno[1,2‐b:5,6‐b′]‐dithiophene (m‐ITIC). Compared to m‐ITIC, these two new acceptors show redshifted absorption, higher molecular packing order, and improved electron mobilities. The power conversion efficiencies (PCE) of the as‐cast PSCs with m‐ITIC‐2F or m‐ITIC‐4F as an acceptor and a low‐cost donor–acceptor (D–A) copolymer PTQ10 as a donor reach 11.57% and 11.64%, respectively, which are among the highest efficiency for the as‐cast PSCs so far. Furthermore, after thermal annealing treatment, improved molecular packing and enhanced phase separation are observed, and the higher PCE of 12.53% is achieved for both PSCs based on the two acceptors. The respective and unique advantage with the intrinsic high degree of order, molecular packing, and electron mobilities of these two acceptors will be suitable to match with different p‐type organic semiconductor donors for higher PCE values, which provide a great potential for the PSCs commercialization in the near future. These results indicate that rational molecular structure optimization is of great importance to further improve photovoltaic properties of the photovoltaic materials.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 21, 2018
- Source ID
- 10.1002/aenm.201800815
Entities
People
- Alexander Liebman‐pelaez
- Chenhui Zhu
- Chenkai Sun
- Chunhe Yang
- Harald Ade
- Indunil Angunawela
- Jia Yao
- Lingwei Xue
- Xiaojun Li
- Yongfang Li
- Zhi‐guo Zhang
Organizations
- Beijing Jiaotong University
- Chinese Academy of Sciences
- Lawrence Berkeley National Laboratory
- Ministry of Science and Technology of the People's Republic of China
- National Natural Science Foundation of China
- North Carolina State University
- Office of Naval Research
- Royal Institute of Chemistry
- Soochow University
- United States Department of Energy
- University of Chinese Academy of Sciences