Adding
an additive is one of the effective strategies to fine-tune
active layer morphology and improve performance of organic solar cells.
In this work, a binary additive 1,8-diiodooctane (DIO) and 2,6-dimethoxynaphthalene
(DMON) to optimize the morphology of PBDB-T:TTC8-O1-4F-based devices
is reported. With the binary additive, a power conversion efficiency
(PCE) of 13.22% was achieved, which is higher than those of devices
using DIO (12.05%) or DMON (11.19%) individually. Comparison studies
demonstrate that DIO can induce the acceptor TTC8-O1-4F to form ordered
packing, while DMON can inhibit excessive aggregation of the donor
and acceptor. With the synergistic effect of these two additives,
the PBDB-T:TTC8-O1-4F blend film with DIO and DMON exhibits a suitable
phase separation and crystallite size, leading to a high short-circuit
current density (J
sc) of 23.04 mA·cm–2 and a fill factor of 0.703 and thus improved PCE.
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