The
power conversion efficiency (PCE) of halogenated solvent spin-coated
organic solar cells (OSCs) has been boosted to a high level (>18%)
by developing efficient photovoltaic materials and precise morphological
control. However, the PCE of OSCs prepared from non-halogenated solvents
and with a scalable printing process is far behind, limited by tough
morphology manipulation. Herein, we have fabricated ternary OSCs by
using layer-by-layer (LBL) blade-coating and a non-halogenated solvent.
The ternary OSCs based on the PM6:IT-M(1:0.2)/BTP-eC9 active layer
are processed with the hydrocarbon solvent 1,2,4-trimethylbenzene
with no need of any additives and post-treatment. The vertical donor/acceptor
distribution is optimized by LBL blade-coating within the PM6:IT-M(1:0.2)/BTP-eC9
active layer. The cascade acceptor IT-M blended in PM6 not only attenuates
the damage of BTP-eC9 to the PM6 crystallization, leading to a dense
nanofiber-like morphology, but also prefers to reside between PM6
and BTP-eC9 to form a cascade energy level alignment for a fast charge-transfer
process. Finally, the improved morphology and crystallization lead
to a reduced molecular recombination, low energy loss, and high open-circuit
voltage. The prepared non-halogenated solvent and LBL blade-coated
OSCs achieve a PCE of 17.16%. The work provides an approach to fabricate
hydrocarbon solvent-processed high-performance OSCs by employing LBL
blade-coating and a ternary strategy.
A new flexible transparent AgNWs:SnO2 electrode for polymer solar cells was prepared via blade-coating. Blade-coated MEA was used to passivate the defects on the surface of the AgNWs:SnO2 electrode and boost the photovoltaic performance of the device.
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