Manipulating the Charge Carriers Through Functionally Bridged Components Advances Low-Cost Organic Solar Cells with Green Solvent Processing

Top Archie Dela Peña, Ruijie Ma, Yongmin Luo, Zengshan Xing, Qi Wei, Yulong Hai, Yao Li, Sheena Anne Garcia, King Lun Yeung, Tao Jia, Kam Sing Wong, He Yan, Gang Li, Mingjie Li, Jiaying Wu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

Organic solar cell (OSC) development continues to demonstrate impressive device efficiency improvements. However, the materials synthetic simplicity essential to industrialization remains seriously lacking attention, imparting inferior performance records in low-cost devices. Hence, low bandgap and completely non-fused electron acceptors (CNFEAs) having simple molecular structures are investigated herein. In contrast to typically explored fused-ring acceptors with smaller backbone conformational variations, minimizing the interface recombination sites through a greater extent of localized domains is identified as more critical in CNFEAs, leading to remarkable fill factors (FFs) approaching 75%, among the highest currently realized for low-cost systems. However, this comes with diminishing charge generation efficiency. The general ternary blend optimization strategy modifying the morphology of host components is limited in preserving such remarkably high FFs. To suppress the trade-off while keeping notable FFs, a new perspective of constructing functionally bridged components based on optical, electronic, and thermodynamic properties is introduced here. Specifically, charge generation is unrestrained from the host acceptor localized domains through the introduction of a “bridge” component while also taking advantage of the configuration to channel polarons toward the efficient transport moieties of the host components. Accordingly, this work incubates understanding-guided optimizations toward the advancement of more practical devices.

Original languageEnglish
JournalAdvanced Energy Materials
DOIs
Publication statusPublished - Nov 2023

Keywords

  • charge carrier dynamics
  • low-cost
  • non-fullerene acceptors
  • non-fused thiophene rings
  • organic solar cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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