Isoindigo-based conjugated polymer for high-performance organic solar cell with a high VOC of 1.06 V as processed from non-halogenated solvent

Eui Hyuk Jung, Hyungju Ahn, Won Ho Jo, Jea Woong Jo, Jae Woong Jung

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The fabrication of organic solar cells using non-halogenated solvents have been recently explored in order to replace conventionally used halogenated solvents that cause environmental, health and safety problems. For achieving highly efficient organic solar cells using non-halogenated solvents, conjugated polymer should be designed and developed to afford high solubility in non-halogenated solvent and desirable photovoltaic properties in finally fabricated devices. Here, we demonstrated that an isoindigo-based copolymer, PiI2fT, composed of isoindigo with 2-decyltetradecane and bithiophene with fluorination is a promising polymer for organic solar cells using eco-friendly non-halogenated solvent. We found that the introduction of fluorine atom in conjugated polymer affords improved photophysical properties including intense light absorption, lowering of the highest occupied molecular orbital energy level and increase of dipole moment, while the introduction of bulk alkyl chain in the polymer may enhance the solubility in organic solvents. When solar cells were fabricated from using o-xylene and diphenyl ether as solvent and additive, PiI2fT polymer exhibited a high PCE of 8.80% with an open-circuit voltage of 1.06 V.

Original languageEnglish
Pages (from-to)113-118
Number of pages6
JournalDyes and Pigments
Volume161
DOIs
StatePublished - Feb 2019

Keywords

  • Fluorination
  • High open-circuit voltage
  • Isoindigo
  • Non-halogenated solvent
  • Organic solar cell

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