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PreprintCC BYChemRxiv

Reducing Synthetic Complexity: A Fluorine-Free Benzodithiophene-Thienopyrrolodione Donor Polymer by Direct Arylation Polycondensation for Organic Photovoltaics

  • Christian Biebl1,2
  • Maria Saladina
  • Chen Wang
  • Pooja Pandey
  • Carsten Deibel
  • Michael Sommer1,2
  1. 1Institut für Physik
  2. 2Technische Universität Chemnitz
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Abstract

Synthetic complexity is a decisive aspect for absorber material availability in organic photovoltaics (OPVs). By using direct arylation polycondensation (DAP), a new route to the donor polymer PBDT-T2-TPD is presented. DAP allows to reduce the amount of toxic chemicals and simplifies the reaction scheme at the same time. Furthermore, this new route allows to vary the molar mass of PBDT-T2-TPD and thus enables the investigation of chain length-dependent OPV parameters in devices with the non-fullerene L8-BO as acceptor. An increasing molar mass results in an improvement of the open-circuit voltage, the fill factor and the power conversion efficiency, while the short-circuit current density saturates after an initial increase. These changes arise from reduced non-radiative voltage losses and enhanced mobility–lifetime products. The performance of the best performing DAP material is at least as

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Cite

BibTeXRIS
BibTeX
@misc{biebl2026reducing,
  title = {{Reducing Synthetic Complexity: A Fluorine-Free Benzodithiophene-Thienopyrrolodione Donor Polymer by Direct Arylation Polycondensation for Organic Photovoltaics}},
  author = {Christian Biebl and Maria Saladina and Chen Wang and Pooja Pandey and Carsten Deibel and Michael Sommer},
  howpublished = {ChemRxiv},
  year = {2026},
  month = sep,
  doi = {10.26434/chemrxiv.15009136/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009136/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Reducing Synthetic Complexity: A Fluorine-Free Benzodithiophene-Thienopyrrolodione Donor Polymer by Direct Arylation Polycondensation for Organic Photovoltaics
AU  - Christian Biebl
AU  - Maria Saladina
AU  - Chen Wang
AU  - Pooja Pandey
AU  - Carsten Deibel
AU  - Michael Sommer
PY  - 2026
DA  - 2026/09/21
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15009136/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009136/v1
AB  - Synthetic complexity is a decisive aspect for absorber material availability in organic photovoltaics (OPVs). By using direct arylation polycondensation (DAP), a new route to the donor polymer PBDT-T2-TPD is presented. DAP allows to reduce the amount of toxic chemicals and simplifies the reaction scheme at the same time. Furthermore, this new route allows to vary the molar mass of PBDT-T2-TPD and thus enables the investigation of chain length-dependent OPV parameters in devices with the non-fullerene L8-BO as acceptor. An increasing molar mass results in an improvement of the open-circuit voltage, the fill factor and the power conversion efficiency, while the short-circuit current density saturates after an initial increase. These changes arise from reduced non-radiative voltage losses and enhanced mobility–lifetime products. The performance of the best performing DAP material is at least as
ER  -