Delicate Morphology Control Triggers 14.7% Efficiency All‐Small‐Molecule Organic Solar Cells

Hua Tang, Haiyan Chen, Cenqi Yan, Jiaming Huang, Wai Keung Patrick Fong, Jie Lv, Dingqin Hu, Ranbir Singh, Manish Kumar, Zeyun Xiao, Zhipeng Kan, Shirong Lu, Gang Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

47 Citations (Scopus)

Abstract

Morphology is a critical factor to determine the photovoltaic performance
of organic solar cells (OSCs). However, delicately fine-tuning the morphology involving only small molecules is an extremely challenging task.
Herein, a simple, generic, and effective concentration-induced morphology
manipulation approach is demonstrated to prompt both the state-of-theart thin-film BTR-Cl:Y6 and thick-film BTR:PC71BM all-small-molecule
(ASM) OSCs to a record level. The morphology is delicately controlled by
subtly altering the prepared solution concentration but maintaining the
identical active layer thickness. The remarkable performance enhancement achieved by this approach mainly results from the enhanced
absorption, reduced trap-assistant recombination, increased crystallinity,
and optimized phase-separated network. These findings demonstrate that
a concentration-induced morphology manipulation strategy can further
propel the reported best-performing ASM OSCs to a brand-new level, and
provide a promising way to delicately control the morphology towards
high-performance ASM OSCs.
Original languageEnglish
Article number2001076
Number of pages9
JournalAdvanced Energy Materials
Volume10
Issue number27
DOIs
Publication statusPublished - 1 Jul 2020

Keywords

  • all-small-molecule
  • high-performance
  • morphology control
  • organic solar cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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