Control Aggregation of P3HT in Solution for High Efficiency Doping: Ensuring Structural Order and the Distribution of Dopants

Duo Liu; Jun-Hang Li; Si-Chun Wang; Lu Zhang; Xin-Yu Liu; Qiang Zhang; Yan-Chun Han

doi:10.1007/s10118-023-2939-x

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Control Aggregation of P3HT in Solution for High Efficiency Doping: Ensuring Structural Order and the Distribution of Dopants

RESEARCH ARTICLE | Updated：2023-04-21

- Control Aggregation of P3HT in Solution for High Efficiency Doping: Ensuring Structural Order and the Distribution of Dopants
- Control Aggregation of P3HT in Solution for High Efficiency Doping: Ensuring Structural Order and the Distribution of Dopants
- 高分子科学（英文版） 2023年41卷第5期页码：811-823
- Affiliations：
  
  a.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  b.School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
- Author bio：
  
  zhqawh@ciac.ac.cn(Q.Z.)
  ychan@ciac.ac.cn(Y.C.H.)
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (No. 51933010). We also thank Beijing Synchrotron Radiation Facility (BSRF) 1W1A.;Electronic supplementary information (ESI) is available free of charge in the online version of this article athttp://doi.org/10.1007/s10118-023-2939-x.
- DOI：10.1007/s10118-023-2939-x
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Control Aggregation of P3HT in Solution for High Efficiency Doping: Ensuring Structural Order and the Distribution of Dopants[J]. 高分子科学（英文版）, 2023,41(5):811-823.

Duo Liu, Jun-Hang Li, Si-Chun Wang, et al. Control Aggregation of P3HT in Solution for High Efficiency Doping: Ensuring Structural Order and the Distribution of Dopants[J]. Chinese Journal of Polymer Science, 2023,41(5):811-823.
Control Aggregation of P3HT in Solution for High Efficiency Doping: Ensuring Structural Order and the Distribution of Dopants[J]. 高分子科学（英文版）, 2023,41(5):811-823. DOI： 10.1007/s10118-023-2939-x.

Duo Liu, Jun-Hang Li, Si-Chun Wang, et al. Control Aggregation of P3HT in Solution for High Efficiency Doping: Ensuring Structural Order and the Distribution of Dopants[J]. Chinese Journal of Polymer Science, 2023,41(5):811-823. DOI： 10.1007/s10118-023-2939-x.

摘要

Here, we regulate the aggregation states of P3HT and doping with F4TCNQ to ensure the polarons on the backbone to have high charge dissociation and transport. The dopants do not destroy the π-π interaction and only enter the alkyl side chain region which has smaller Coulomb interaction to the polarons.

Abstract

Molecular doping is one of the most important tools to manipulate the electrical properties of conjugated polymers for application in organic optoelectronics. The polymer crystallinity and distribution position of the dopant crucially determine electrical conductivity of the doped polymer. However, in solution-mixed doping, the interplay between polymer and dopant leads to highly structural disorder of polymer and random arrangement of dopant. Here, we propose a strategy to ensure the dopant induced polarons have high charge dissociation and transport by letting the conjugated polymers aggregate in the marginal solvent solution by cooling it from higher temperature to room temperature. We select poly(3-hexylthiophene-2,5-diyl) (P3HT) solution doped by 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) as a model system. P3HT crystallizes in the marginal solvent, such as 1,1,2-trichloroethane (TCE) driven by the favor,π,-,π,interaction between planar polymer backbone. The dopant F4TCNQ enters the alkyl side chain region not the,π,-,π,stacking region and thus guarantees high crystallinity and the,π,-,π,interaction of P3HT. This distribution of F4TCNQ which away from the polymer backbone to ensure higher charge dissociation and transport. Finally, we obtained a high conductivity value of 23 S/cm by doping P3HT with 20% F4TCNQ by using the marginal solvent, which is higher than doping P3HT with a disordered coil conformation in chlorobenzene (CB) of 7 S/cm, which the dopants enter both the alkyl side chain region and the,π,-,π,stacking region.

关键词

Keywords

SolventCrystallineDopant locationDoping efficiencyElectrical conductivity

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