Publication detail

Diketopyrrolopyrrole-Based Organic Solar Cells Functionality: The Role of Orbital Energy and Crystallinity

HEINRICHOVÁ, P. POSPÍŠIL, J. STŘÍTESKÝ, S. VALA, M. WEITER, M. TOMAN, P. RAIS, D. PFLEGER, J. VONDRÁČEK, M. ŠIMEK, D. FEKETE, L. HORÁKOVÁ, P. DOKLÁDALOVÁ, L. KUBÁČ, L. KRATOCHVÍLOVÁ, I.

Original Title

Diketopyrrolopyrrole-Based Organic Solar Cells Functionality: The Role of Orbital Energy and Crystallinity

Type

journal article in Web of Science

Language

English

Original Abstract

In this work, we investigated diketopyrrolopyrrole (DPP) derivatives as potential donor materials for fullerene:DPP solar cells. The derivatives 3,6-bis(5-(benzofuran-2-yl)thiophene-2-yl)-2,5-bis(2-ethylhexyl)pyrrolo[3,4-c]pyrrole-1,4-dione (DPP(TBFu)2) and 3,6-bis(5-(benzothiophene-2-yl)thiophene-2-yl)-2,5-bis(2-ethylhexyl)pyrrolo[3,4-c]pyrrole-1,4-dione (DPP(TBTh)2) were modified by introducing a nitrogen atom into the terminal moiety of the molecule. Our quantum-chemical calculations predicted that this modification would increase the rigidity of the molecular structure and increase the ionization potential relative to the original DPP derivatives. The higher ionization potential primarily supports an enhancement in the open circuit voltage, and a more rigid molecular structure will contribute to reduced nonradiative losses. We experimentally verified the fullerene:DPP solar cell concept based on the coincidence of a smaller driving force for charge separation at the donor/acceptor interface and the crystallinity of the studied DPP derivatives for preparing effective photovoltaic devices. The reduction of the driving force for charge separation could be overcome by more structured/packed donor DPP materials; the delocalization of electrons and holes in such structured materials improves charge separation in OPV devices. Using wide range of experimental methods, we determined the parameters of the studied DPP materials with PC70BM in thin films. This work contributes to practical applications by verifying the concept of this organic solar cell design.

Keywords

Organic solar cells, energy transfer, charge transfer, DPP, fullerene, heterojunction

Authors

HEINRICHOVÁ, P.; POSPÍŠIL, J.; STŘÍTESKÝ, S.; VALA, M.; WEITER, M.; TOMAN, P.; RAIS, D.; PFLEGER, J.; VONDRÁČEK, M.; ŠIMEK, D.; FEKETE, L.; HORÁKOVÁ, P.; DOKLÁDALOVÁ, L.; KUBÁČ, L.; KRATOCHVÍLOVÁ, I.

Released

16. 4. 2019

Publisher

American Chemical Society

Location

USA

ISBN

1932-7447

Periodical

Journal of Physical Chemistry C (print)

Year of study

123

Number

18

State

United States of America

Pages from

11447

Pages to

11463

Pages count

16

URL

https://pubs.acs.org/doi/full/10.1021/acs.jpcc.9b01328

BibTex

@article{BUT157617,
  author="Patricie {Heinrichová} and Jan {Pospíšil} and Stanislav {Stříteský} and Martin {Vala} and Martin {Weiter} and Petr {Toman} and David {Rais} and Jiří {Pfleger} and Martin {Vondráček} and Daniel {Šimek} and Ladislav {Fekete} and Petra {Horáková} and Lenka {Dokládalová} and Lubomír {Kubáč} and Irena {Kratochvílová}",
  title="Diketopyrrolopyrrole-Based Organic Solar Cells Functionality: The Role of Orbital Energy and Crystallinity",
  journal="Journal of Physical Chemistry C (print)",
  year="2019",
  volume="123",
  number="18",
  pages="11447--11463",
  doi="10.1021/acs.jpcc.9b01328",
  issn="1932-7447",
  url="https://pubs.acs.org/doi/full/10.1021/acs.jpcc.9b01328"
}