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

22 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

Bibliographical note

Funding Information:
OSCs has been successfully demonstrated. Raman, UV-Vis, PL, TEM, and AFM analyses exfoliation of bulk MoS2 into few-layer nanosheets in the presence of oleylamine via a simple and confirmed the successful exfoliation of bulk MoS2 into few-layer nanosheets in the presence cost-effective solution-based method. The OSCs fabricated with the synthesized PEDOT:PSS/FMoS2 of oleylamine via a simple and cost-effective solution-based method. The OSCs fabricated hybrids as HTL exhibited PCE values up to 3.74%, which is 15.08% higher than that of the reference with the synthesized PEDOT:PSS/FMoS2 hybrids as HTL exhibited PCE values up to 3.74%, cells having simple PEDOT:PSS as HTL. The hybrid HTL films showed better surface properties for the which is 15.08% higher than that of the reference cells having simple PEDOT:PSS as HTL. The deposition of the hydrophobic active layer, consequently, the charge-transfer resistance was minimized hybrid HTL films showed better surface properties for the deposition of the hydrophobic for OSCs fabricated with hybrid HTL compared with reference cells, improving the OSC performance. active layer, consequently, the charge-transfer resistance was minimized for OSCs fabricated Due to their simple preparation method, 2D FMoS2-incorporated PEDOT:PSS-based HTL provides with hybrid HTL compared with reference cells, improving the OSC performance. Due to valuable alternative HTL for OSCs. their simple preparation method, 2D FMoS2-incorporated PEDOT:PSS-based HTL provides valuable aSupplementarylternative HTMaterials: TheL for OSCs. following are available online at http://www.mdpi.com/2079-4991/9/9/1328/s1, Figures S1 and S2: PL spectra and AFM image of oleylamine-functionalized MoS2 (FMoS2) respectively, Figures Supplementary Materials: The following are available online at www.mdpi.com/xxx/s1, Figu2re S1, S2: PL spectra and AFM image of oleylamine-functionalized MoS2 (FMoS2) respectively, Figure S3, S4: Contac2 t angles absorbance spectra of P3HT:PCBM thin film spin-coated on PEDOT:PSS and PEDOT:PSS FMoS2. and AFM images of PEDOT:PSS and PEDOT:PSS combined with FMoS2 respectively, Figure S5: (a) UV-Vis transmittance spectra of PEDOT:PSS and PEDOT:PSS combined with FMoS2, (b) UV-Vis absorbance spectra of of results and wrote the manuscript. K.Y.R. performed GIWAXS measurements and interpreted the data. P3HT:PCBM thin film spin-coated on PEDOT:PSS and PEDOT:PSS FMoS2. J.W.L. performed IPCE measurements and guided for manuscript revisions. A.B., H.K., J.-E.L. performed the Author Contributions: M. S. Ramasamy, prepared the content of this research, carried out device fabrication, analysis of results and wrote the manuscript. K. Y. Ryu performed GIWAXS measurements and interpreted the Funding: This work was supported by National Research Foundation of Korea Grant funded by the Korean Government (2017R1A2A1A05022387 and 2016M1A2A2940914) and by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20173010013340 and 20163030013900).

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

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

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