Phosphine oxide and Amino N-oxide functionalized phenylquinoline-based small molecules: New cathode interfacial layers for high-performance inverted organic solar cells

Nallan Chakravarthi, Ho Yeol Park, Um Kanta Aryal, Junyoung Kim, Yeong Soon Gal, Myungkwan Song, Young Rae Cho, Sung Ho Jin*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Two novel small-molecules PO-PhQ and PO-PhQNO, in which both polar phosphine oxide (PO) and N–oxide (NO) groups are incorporated in phenyl quinolone core unit were synthesized as efficient cathode interfacial layers (CILs) for inverted organic solar cells (IOSCs). Because of the phenylquinoline (PhQ) group, both PO-PhQ and PO-PhQNO are endorsed with high electron mobility. Due to the presence of polar P=O and N-oxide groups in their molecular structure, PO-PhQ and PO-PhQNO possess good solubility in polar solvents which make them as suitable candidates for interfacial modification of solution processed multilayer IOSCs. As a result, the power conversion efficiency (PCE) of the inverted devices based polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7):(6,6)-phenyl-C71-butyric acid methyl ester (PC71BM) active layer with PO-PhQ and PO-PhQNO as CILs achieve PCE values of 9.03 and 8.53%, respectively, with 10–16% improvement than that of the control device with ZnO. In addition, both PO-PhQ and PO-PhQNO make certain the IOSC devices with long-term stability. To the best of our knowledge, this is the first time that cathode interfacial materials based on the combination of PhQ and P=O groups is reported. The effective application of these alcohol solution processed CILs indicate that the lending P=O to PhQ could be very promising strategy in developing high performance and eco-friendly solar cells. Our findings would contribute to enhancing the OSC device performances from synthetically view point of designing new materials.

Original languageEnglish
JournalOrganic Electronics
Volume58
Pages (from-to)111-118
ISSN1566-1199
DOIs
Publication statusPublished - Jul 2018
Externally publishedYes

Keywords

  • Cathode interfacial layers
  • Long-term stability
  • Phenylquinoline
  • Phosphine oxide and N–oxide

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