Elucidating double aggregation mechanisms in the morphology optimization of diketopyrrolopyrrole-based narrow bandgap polymer solar cells

Jing Gao, Wei Chen, Letian Dou, Chun Chao Chen, Wei Hsuan Chang, Yongsheng Liu, Gang Li, Yang Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

45 Citations (Scopus)


The power conversion efficiency (PCE) of a DPP-based polymer solar cell is significantly improved by using DIO or DCB as processing additives. The discovery that DCB outperforms DIO with a significantly wider solvent mixture operation window suggests different optimization mechanisms. Although both solvent mixture systems involve double aggregation processes, including a similar solution-to-film aggregation, however, two distinct solution-stage aggregations are observed: relatively amorphous polymer aggregates form in the CF-DIO solution, while more crystalline polymer aggregates form in CF-DCB solution. KGaA, Weinheim.
Original languageEnglish
Pages (from-to)3142-3147
Number of pages6
JournalAdvanced Materials
Issue number19
Publication statusPublished - 21 May 2014
Externally publishedYes


  • polymer aggregation
  • polymer crystallization
  • polymer solar cells
  • solution-stage morphology
  • solvent mixtures

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this