articleACS Energy LettersAug 18, 2020Closed access

Self-Assembled Monolayer Enables Hole Transport Layer-Free Organic Solar Cells with 18% Efficiency and Improved Operational Stability

YLYuanbao LinYFYuliar FirdausFHFurkan H. IsikgorMIMohamad Insan NugrahaEYEmre Yengel

King Abdullah University of Science and Technology · National Technical University of Athens

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Abstract

We report on bulk-heterojunction (BHJ) organic photovoltaics (OPVs) based on the self-assembled monolayer (SAM) 2PACz as a hole-selective interlayer functionalized directly onto the indium tin oxide (ITO) anode. The 2PACz is found to change the work function of ITO while simultaneously affecting the morphology of the BHJ deposited atop. Cells with PM6:N3 BHJ and ITO-2PACz anode exhibit a power conversion efficiency (PCE) of 16.6%, which is greater than that measured for bare ITO (6.45%) and ITO/PEDOT:PSS (15.94%) based devices. The enhanced performance is attributed to lower contact-resistance, reduced bimolecular recombination losses, and improved charge transport within the BHJ. Importantly, the…

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Topics & keywords

Topics
Keywords
  • PEDOT:PSS
  • Anode
  • Indium tin oxide
  • Materials science
  • Organic solar cell
  • Monolayer
  • Polymer solar cell
  • Work function
UN Sustainable Development Goals
  • Affordable and clean energy
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