Solution-processed PEDOT: PSS/MoS2 nanocomposites as efficient hole-transporting layers for organic solar cells

Madeshwaran Sekkarapatti Ramasamy, Ka Yeon Ryu, Ju Won Lim, Asia Bibi, Hannah Kwon, Ji Eun Lee, Dong Ha Kim, Kyungkon Kim

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

An efficient hole-transporting layer (HTL) based on functionalized two-dimensional (2D) MoS2-poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT: PSS) composites has been developed for use in organic solar cells (OSCs). Few-layer, oleylamine-functionalized MoS2 (FMoS2) nanosheets were prepared via a simple and cost-effective solution-phase exfoliation method; then, they were blended into PEDOT: PSS, a conducting conjugated polymer, and the resulting hybrid film (PEDOT: PSS/FMoS2) was tested as an HTL for poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT: PCBM) OSCs. The devices using this hybrid film HTL showed power conversion efficiencies up to 3.74%, which is 15.08% higher than that of the reference ones having PEDOT: PSS as HTL. Atomic force microscopy and contact angle measurements confirmed the compatibility of the PEDOT: PSS/FMoS2 surface for active layer deposition on it. The electrical impedance spectroscopy analysis revealed that their use minimized the charge-transfer resistance of the OSCs, consequently improving their performance compared with the reference cells. Thus, the proposed fabrication of such HTLs incorporating 2D nanomaterials could be further expanded as a universal protocol for various high-performance optoelectronic devices.

Original languageEnglish
Article number1328
JournalNanomaterials
Volume9
Issue number9
DOIs
StatePublished - Sep 2019

Keywords

  • Hole-transporting layer
  • MoS
  • Oleylamine
  • Organic solar cells

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