TY - JOUR
T1 - 18.4% Organic Solar Cells Using a High Ionization Energy Self-Assembled Monolayer as Hole Extraction Interlayer
AU - Lin, Yuanbao
AU - Magomedov, Artiom
AU - Firdaus, Yuliar
AU - Kaltsas, Dimitris
AU - El Labban, Abdulrahman
AU - Faber, Hendrik
AU - Naphade, Dipti R
AU - Yengel, Emre
AU - Zheng, Xiaopeng
AU - Yarali, Emre
AU - Chaturvedi, Neha
AU - Loganathan, Kalaivanan
AU - Gkeka, Despoina
AU - Alshammari, Sanaa Hayel Nazil
AU - Bakr, Osman
AU - Laquai, Frédéric
AU - Tsetseris, Leonidas
AU - Getautis, Vytautas
AU - Anthopoulos, Thomas D.
N1 - KAUST Repository Item: Exported on 2021-05-03
PY - 2021/4/29
Y1 - 2021/4/29
N2 - Self-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.
AB - Self-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.
UR - http://hdl.handle.net/10754/669027
UR - https://onlinelibrary.wiley.com/doi/10.1002/cssc.202100707
U2 - 10.1002/cssc.202100707
DO - 10.1002/cssc.202100707
M3 - Article
C2 - 33928763
SN - 1864-5631
JO - ChemSusChem
JF - ChemSusChem
ER -