In high-performance bulk heterojunction organic solar
cells (BHJ
OSCs), cathode interlayers (CILs) have been effective in enhancing
the device stability and photovoltaic performance by reducing the
electron traps of ZnO layers. In this work, three water/alcohol-soluble
conjugated polyelectrolytes (CPEs), P2T-CDTNa, PC-CDTNa, and PNDIT-FNa,
as cathode interlayers (CILs) are reported. The effect of these three
CPEs is validated by using PBDB-T:ITIC and PM6:Y6 as photoactive blends.
Compared with ZnO-only devices, all three ZnO/CPE-based devices demonstrate
enhanced photovoltaic performances. Especially, the ZnO/P2T-CDTNa-based
devices show impressive power conversion efficiencies (PCEs) of 9.93%
(V
OC = 0.87 V, J
SC = 16.56 mA/cm2, and FF = 69.04%) and 16.15% (V
OC = 0.84 V, J
SC = 27.71 mA/cm2, and FF = 69.60%) for PBDB-T:ITIC and
PM6:Y6 BHJ photoactive blends, respectively.
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