Citation: YI Yanlin, LIANG Qiuju, LI Lingdong, LIU Jian'gang, HAN Yanchun. Constructing Interpenetrating Network of Polymer/Non-fullerene Blend System by Small Molecule Preferential Crystallization[J]. Chinese Journal of Applied Chemistry, ;2019, 36(4): 423-430. doi: 10.11944/j.issn.1000-0518.2019.04.180404 shu

Constructing Interpenetrating Network of Polymer/Non-fullerene Blend System by Small Molecule Preferential Crystallization

YI Yanlin ^a ,
LIANG Qiuju ^b ,
LI Lingdong ^a,, ,
LIU Jian'gang ^b,, ,
HAN Yanchun ^b,,

a.
State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin, Liaoning 124221, China
b.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: LI Lingdong, lild@dlut.edu.cn LIU Jian'gang, niitawh@ciac.ac.cn HAN Yanchun, ychan@ciac.ac.cn
Received Date: 20 December 2018
Revised Date: 13 January 2019
Accepted Date: 23 January 2019

Fund Project: Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry 2015.07Fundamental Research Funds for the Central Universities DUT17LK17Supported by the Fundamental Research Funds for the Central Universities(No.DUT14RC(3)081, No.DUT17LK17), the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry(No.2015.07)Fundamental Research Funds for the Central Universities DUT14RC(3)081

Figures(6)

The ordered aggregation of non-fullerene small molecular acceptors(SMAs) is critical in determining the charge transport and bimolecular recombination in polymer/SMAs solar cells. However, due to the asymmetric phase separation, the polymers prefer to form crystalline networks, which inhibits the molecular diffusion of SMAs and results in weak crystallinity of SMAs. In poly[(2, 6-(4, 8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1, 2-b:4, 5-b']dithiophene))-alt-(5, 5-(1', 3'-di-2-thienyl-5', 7'bis(2-ethylhexyl)benzo[1', 2'-c:4', 5'-c']dithiophene-4, 8-dione))](PBDB-T)/9-bis(2-methylene-((3-(1, 1-dicyanomethylene)-6, 7-difluoro)-indanone))-5, 5, 11, 11-tetrakis(4-hexylphenyl)-dithieno[2, 3-d:2', 3'-d']-s-indaceno[1, 2-b:5, 6-b']dithiophene(IT-4F) blends, crystallization of IT-4F could be improved by tetrahydrofuran solvent vapor annealing, while crystallization of PBDB-T could be enhanced by thermal annealing at 150℃. Hence, the prior crystallization of IT-4F could be realized by regulating the sequence of two post annealing methods, which facilitates the diffusion of IT-4F and is benefit for the formation of interpenetrating network. The optimization of the film morphology reduced the bimolecular recombination and resulted in an improved device performance from 5.95% to 7.18%.
- polymer non-fullerene solar cells,
- crystallization,
- phase separation,
- morphology,
- post processing
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