Morphology Regulation by Upside-Down Thermal Annealing Based on Blend Thick-Film Organic Solar Cells

Xiaohua Zhang, Pu Fan, Zijun Wang, Ding Zheng*, Junsheng Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The morphology property of the active layer which is determined by the post-treatment plays a critical role in optimizing the power conversion efficiency (PCE) of organic solar cells (OSCs). Here, we present a novel upside-down thermal annealing (DTA) method to regulate the morphology of PffBT4T-2OD:PC71BM (poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3′′′-di(2-octyldodecyl)-2,2′5′,2′′5′′,2′′′-quaterthiophen-5,5′′′-diyl)]:6,6-phenyl C71 butyric acid methyl ester) and further increase the PCE. Compared with regular thermal annealing treatment, a dramatic 15% enhancement in PCE to 10.4% was obtained after the DTA process, which is attributed to the more orderly packed π-πstacking of the PffBT4T-2OD network and the redistribution of the PC71BM molecules. Besides, the DTA method is beneficial for boosting the dissociation of excitons and transport of charge carriers. This ideal bulk-heterojunction (BHJ) morphology regulation by DTA based on thick-film OSCs is an effective way to achieve high-performance OSCs.

Original languageEnglish (US)
Pages (from-to)15194-15199
Number of pages6
JournalJournal of Physical Chemistry C
Volume125
Issue number28
DOIs
StatePublished - Jul 22 2021
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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