18.4% Organic Solar Cells Using a High Ionization Energy Self-Assembled Monolayer as Hole Extraction Interlayer
El Labban, Abdulrahman
Naphade, Dipti R
Alshammari, Sanaa Hayel Nazil
Anthopoulos, Thomas D.
KAUST DepartmentMaterial Science and Engineering
Physical Science and Engineering (PSE) Division
KAUST Solar Center (KSC)
KAUST KSC: King Abdullah University of Science and Technology KAUST Solar Research Center PSE SAUDI ARABIA
KAUST Catalysis Center (KCC)
Material Science and Engineering Program
Embargo End Date2022-04-29
Permanent link to this recordhttp://hdl.handle.net/10754/669027
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AbstractSelf-assembled monolayers (SAMs) based on Br-2PACz and MeO-2PACz molecules are investigated as hole-extracting interlayers in organic photovoltaics (OPVs). The highest occupied molecular orbital (HOMO) energies of these SAMs were measured at -6.01 and -5.30 eV for Br-2PACz and MeO-2PACz, respectively, and found to induce significant changes in the work function (WF) of indium-tin-oxide (ITO) electrodes upon chemical functionalization. OPV cells based on PM6:BTP-eC9:PC 71 BM using ITO/Br-2PACz anodes exhibit a maximum power conversion efficiency (PCE) of 18.4%, outperforming devices with ITO/MeO-2PACz (14.5%) and ITO/PEDOT:PSS (17.5%). The higher PCE is found to originate from the much higher WF of ITO/Br-2PACz (-5.81 eV) compared to ITO/MeO-2PACz (4.58 eV) and ITO/PEDOT:PSS (4.9 eV), resulting in lower interface resistance, improved hole transport/extraction, lower trap-assisted recombination, and longer carrier lifetimes. Importantly, the ITO/Br-2PACz electrode is chemically stable and after removal of the SAM it can be recycled and reused to construct fresh OPVs with equally impressive performance.
CitationLin, Y., Magomedov, A., Firdaus, Y., Kaltsas, D., El-Labban, A., Faber, H., … Anthopoulos, T. D. (2021). 18.4% Organic Solar Cells Using a High Ionization Energy Self-Assembled Monolayer as Hole Extraction Interlayer. ChemSusChem. doi:10.1002/cssc.202100707
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