Table 2.

Photovoltaic parameters for PBDB-TF:IT-4F based devices with different SAs incorporated into the casting solution

Additive	Mol.wt.	wt.%a	Voc (V)	Jsc (mA cm−2)	FF	PCE (%)b
SA-2	234	15.6	0.87 ± 0.01	20.4 ± 0.3	0.75 ± 0.01	13.3 ± 0.2 (13.6)
SA-3	260	17.3	0.87 ± 0.01	20.3 ± 0.2	0.75 ± 0.02	13.2 ± 0.3 (13.5)
SA-4	254	16.0	0.87 ± 0.01	20.2 ± 0.2	0.75 ± 0.02	13.2 ± 0.3 (13.6)
SA-5	270	18.0	0.88 ± 0.01	20.2 ± 0.2	0.71 ± 0.01	12.6 ± 0.2 (12.9)
SA-6	276	18.4	0.88 ± 0.01	19.9 ± 0.3	0.70 ± 0.02	12.2 ± 0.3 (12.6)
SA-7	288	19.2	0.85 ± 0.01	19.8 ± 0.4	0.68 ± 0.02	11.4 ± 0.2 (11.6)
SA-8	302	20.1	0.87 ± 0.01	18.9 ± 0.4	0.56 ± 0.04	9.3 ± 0.5 (10.0)

^aThe weight ratios of different additives for PBDB-TF:IT-4F-based devices were calculated from each case when the mole ratio of IT-4F: the additive was 1:1

^bThe maximum PCEs are shown in the parentheses