Revealing the side-chain-dependent ordering transition of highly crystalline double-cable conjugated polymers

Guitao Feng, Wenliang Tan, Safakath Karuthedath, Cheng Li, Xuechen Jiao, Amelia C.Y. Liu, Hariprasad Venugopal, Zheng Tang, Long Ye, Frédéric Laquai, Christopher R. McNeill, Weiwei Li

Research output: Contribution to journalArticleResearchpeer-review

30 Citations (Scopus)

Abstract

We developed a series of highly crystalline double-cable conjugated polymers for application in single-component organic solar cells (SCOSCs). These polymers contain conjugated backbones as electron donor and pendant perylene bisimide units (PBIs) as electron acceptor. PBIs are connected to the backbone via alkyl units varying from hexyl (C6H12) to eicosyl (C20H40) as flexible linkers. For double-cable polymers with short linkers, the PBIs tend to stack in a head-to-head fashion, resulting in large d-spacings (e.g. 64 Å for the polymer P12 with C12H24 linker) along the lamellar stacking direction. When the length of the linker groups is longer than a certain length, the PBIs instead adopt a more ordered packing likely via H-aggregation, resulting in short d-spacings (e.g. 50 Å for the polymer P16 with C16H32 linker). This work highlights the importance of linker length on the molecular packing of the acceptor units and the influences on the photovoltaic performance of SCOSCs.

Original languageEnglish
Pages (from-to)25499-25507
Number of pages9
JournalAngewandte Chemie - International Edition
Volume60
Issue number48
DOIs
Publication statusPublished - 22 Nov 2021

Keywords

  • cryo-transmission electron microscopy
  • double-cable conjugated polymers
  • lamellar stacking
  • single-component organic solar cells

Cite this