Efficient organic solar cells with small energy losses based on a wide-bandgap trialkylsilyl-substituted donor polymer and a non-fullerene acceptor

Haijun Bin, Tom P.A. van der Pol, Junyu Li, Bas T. van Gorkom, Martijn M. Wienk, René A.J. Janssen (Corresponding author)

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Abstract

Efficient organic solar cells based on a blend of PBDS-T as a donor polymer and BTP-eC9 as non-fullerene acceptor are presented and characterized. PBDS-T is an alternating copolymer that comprises easily accessible electron-rich trialkylsilyl-substituted benzodithiophene and electron-deficient benzodithiophene-4,8-dione units and that can be efficiently and reproducibly synthesized in high molecular weights, while keeping good solubility. PBDS-T exhibits a strong absorption between 450 and 700 nm and combines a wide optical bandgap of 1.86 eV, with low-lying energy levels, and a face-on molecular orientation in thin films. Organic solar cells prepared by blending PBDS-T with BTP-eC9 show considerable performance when as-cast films are annealed in solvent vapor and present a high open-circuit voltage of 0.86 V, a low photon-energy loss of 0.53 eV, and an internal quantum efficiency of 93%. The power conversion efficiency reaches 16.4%, which − to the best of our knowledge − is the highest for a conjugated polymer comprising trialkylsilyl side chains in combination with a Y6-based non-fullerene acceptor. Specifically, the trialkylsilyl side-chains of PBDS-T reduce synthetic complexity, result in a low energy loss by ensuring low energetic disorder, and provide competitive device performance.

Original languageEnglish
Article number134878
Number of pages8
JournalChemical Engineering Journal
Volume435
DOIs
Publication statusPublished - 1 May 2022

Bibliographical note

Funding Information:
The research has received funding from the Netherlands Organisation for Scientific Research via the NWO Spinoza grant. We further acknowledge funding from the Ministry of Education, Culture and Science (Gravity program 024.001.035). The work is further part of the Advanced Research Center for Chemical Building Blocks, ARC CBBC, which is co-founded and co-financed by Netherlands Organisation for Scientific Research (NWO).

Funding Information:
The research has received funding from the Netherlands Organisation for Scientific Research via the NWO Spinoza grant. We further acknowledge funding from the Ministry of Education, Culture and Science (Gravity program 024.001.035). The work is further part of the Advanced Research Center for Chemical Building Blocks, ARC CBBC, which is co-founded and co-financed by Netherlands Organisation for Scientific Research (NWO).

Publisher Copyright:
© 2022 The Author(s)

Keywords

  • Conjugated polymer
  • Low energy loss
  • Morphology
  • Non-fullerene acceptor
  • Organic solar cell

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