A PDTPQx:PC61BM blend with pronounced charge-transfer absorption for organic resonant cavity photodetectors – direct arylation polymerization vs. Stille polycondensation

Tom Vandermeeren, Quan Liu, Sam Gielen, Dries Theunissen, Siebe Frederix, Melissa Van Landeghem, Zhen Liu, Niko Van den Brande, Jan D'Haen, Jochen Vanderspikken, Laurence Lutsen, Koen Vandewal, Wouter Maes

Research output: Contribution to journalArticle

Abstract

Because of their intriguing properties for optoelectronic applications, research on organic semiconducting polymers has steadily progressed over the past decades, yielding increasingly fine-tuned (hetero)aromatic polymer backbones. In this work, the push-pull copolymer PDTPQx is synthesized, both via Stille polycondensation and direct arylation polymerization (DArP), permitting comparison of the two procedures. Near-infrared organic photodetectors (OPDs) are constructed based on these different polymer batches in combination with PC61BM, and their performance was investigated. From the current-voltage characteristics, it is clear that the DArP polymer-based devices outperform those prepared from the Stille polymers, both in terms of dark current density and external quantum efficiency (EQE), and therefore in terms of specific detectivity as well. The relatively high highest occupied molecular orbital energy level of PDTPQx, in combination with the clear charge-transfer absorption band observed for the DArP-based device, is beneficial for application in organic resonant cavity photodetectors. Such OPDs are prepared for the DArP PDTPQx:PC61BM (1:4) blends with 180 and 210 nm thick bulk heterojunction active layers. EQEs of 2.5% at 1016 nm and 1% at 1140 nm are achieved, with full-width-at-half-maximum peak responses of 44 and 45 nm, respectively, and detectivities of 2.24 × 1010 and 1.06 × 1010 Jones.

Original languageEnglish
Article number110130
Number of pages8
JournalDyes and Pigments
Volume200
DOIs
Publication statusPublished - Apr 2022

Keywords

  • Direct arylation polymerization
  • Intermolecular charge transfer
  • Near-infrared
  • Optical cavities
  • Organic photodetectors

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