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PreprintCC BY-NC-NDChemRxiv

Polymorph Influence on Sequential Anion Exchange Doping and Charge Transport in Poly(didodecyl-quaterthiophene) (PQT) for Organic Thermoelectrics

  • Jie-Hao Chen
  • Naisong Shan1,2
  • Yunhao Zhao1,2
  • Alexander Filatov3,2
  • Sihong Wang1,2
  • Shrayesh Patel
  1. 1Pritzker School of Molecular Engineering
  2. 2University of Chicago
  3. 3Department of Chemistry
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Abstract

Anion exchange doping (AED) is a key strategy for optimizing organic thermoelectrics (OTEs).However, the influence of specific polymer microstructures like polymorphs on AED has received relatively little attention.Here, we investigate the interplay between thermally induced polymorphism in poly(dodecyl-quaterthiophene) (PQT) and sequential AED efficiency using FeCl3 and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI).By precisely fabricating microstructural gradients via a custom thermal annealing stage, we rapidly screen AED behavior across a spectrum of structural states within a single PQT film.We reveal that pre-set polymorphism acts as a fundamental gating mechanism for dopant infiltration.The expanded lamellar spacing of the (100) polymorph, formed after annealing at elevated temperatures, allows for greater dopant uptake, and thus enables electronic conductivity () as high as 522.0 ± 23.0 S/cm and a maximum power factor of 15.4 μW/mK 2 .Conversely, the tighter (100)' polymorph restricts doping level and structural ordering.This work establishes that pre-forming the (100) polymorph is a critical prerequisite for maximizing charge transport and thermoelectric performance in sequentially doped PQT.

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Cite

BibTeXRIS
BibTeX
@misc{chen2026polymorph,
  title = {{Polymorph Influence on Sequential Anion Exchange Doping and Charge Transport in Poly(didodecyl-quaterthiophene) (PQT) for Organic Thermoelectrics}},
  author = {Jie-Hao Chen and Naisong Shan and Yunhao Zhao and Alexander Filatov and Sihong Wang and Shrayesh Patel},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv.15009871/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009871/v1},
  note = {CC BY-NC-ND},
}
RIS
TY  - UNPB
TI  - Polymorph Influence on Sequential Anion Exchange Doping and Charge Transport in Poly(didodecyl-quaterthiophene) (PQT) for Organic Thermoelectrics
AU  - Jie-Hao Chen
AU  - Naisong Shan
AU  - Yunhao Zhao
AU  - Alexander Filatov
AU  - Sihong Wang
AU  - Shrayesh Patel
PY  - 2026
DA  - 2026/10/05
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15009871/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009871/v1
AB  - Anion exchange doping (AED) is a key strategy for optimizing organic thermoelectrics (OTEs).However, the influence of specific polymer microstructures like polymorphs on AED has received relatively little attention.Here, we investigate the interplay between thermally induced polymorphism in poly(dodecyl-quaterthiophene) (PQT) and sequential AED efficiency using FeCl3 and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI).By precisely fabricating microstructural gradients via a custom thermal annealing stage, we rapidly screen AED behavior across a spectrum of structural states within a single PQT film.We reveal that pre-set polymorphism acts as a fundamental gating mechanism for dopant infiltration.The expanded lamellar spacing of the (100) polymorph, formed after annealing at elevated temperatures, allows for greater dopant uptake, and thus enables electronic conductivity () as high as 522.0 ± 23.0 S/cm and a maximum power factor of 15.4 μW/mK 2 .Conversely, the tighter (100)' polymorph restricts doping level and structural ordering.This work establishes that pre-forming the (100) polymorph is a critical prerequisite for maximizing charge transport and thermoelectric performance in sequentially doped PQT.
ER  -