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    Solution-Processed PEDOT:PSS/MoS2 Nanocomposites as Efficient Hole-Transporting Layers for Organic Solar Cells

    Year: 2019

    Journal: Nanomaterials, Volume 9, SEP

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

    Organizations: National Research Foundation of Korea Grant - Korean Government [2017R1A2A1A05022387, 2016M1A2A2940914]; Korea Institute of Energy Technology Evaluation and Planning (KETEP) of the Republic of Korea [20173010013340, 20163030013900]; Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20173010013340, 20163030013900]

    Keywords: organic solar cells; MoS2; hole-transporting layer; oleylamine

    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-C-61-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.
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