Table 2. Solar cell characteristics of the optimized solar cells based on 4a–c/PC₇₁BM (or PC₆₁BM).

Device	Additive	Annealing time at 90 °C (min)	J SC (mA cm−2)	V OC (V)	FF (%)	PCE (%)
4a/PC61BMa	1% pyridine	10	6.44	0.76	28.98	1.42
4a/PC71BMa	1% pyridine	10	7.20	0.90	48.12	3.21
4b/PC61BMa	1% pyridine	10	10.09	0.80	56.33	4.55
4b/PC71BMa	1% pyridine	10	10.14	0.90	55.60	5.07
4c/PC61BMa	1% pyridine	10	10.72	0.89	52.12	4.98
4c/PC71BMa	1% pyridine	10	12.14	0.89	48.07	5.20
4c/PC71BMa	1% pyridine	0	4.84	0.92	29.18	1.30
4c/PC71BMa	1% pyridine	5	12.28	0.91	54.67	6.11
4c/PC71BMa	1% pyridine	20	12.22	0.90	50.35	5.54
4c/PC71BMb	1% pyridine	5	13.32	0.91	63.60	7.70
4c/PC71BMc	1% pyridine	0	6.26	0.892	38.1	2.12
4c/PC71BMc	1% pyridine	5	12.89	0.901	65.1	7.55
4c/PC71BMd	1% pyridine	—	12.87	0.910	64.5	7.55
4c/PC71BMe	1% pyridine	—	12.87	0.882	59.2	6.62
4c/PC71BMf	1% pyridine	—	12.53	0.876	57.0	6.26

^a4a–c/PC₆₁BM or 4a–c/PC₇₁BM with a 1 : 1 weight ratio in solar cells with conventional structures based on fresh cells.

^b4c/PC₇₁BM with a 1 : 1.2 weight ratio in solar cells with conventional structures based on fresh cells.

^c4c/PC₇₁BM with a 1 : 1.2 weight ratio in solar cells with inverted structures based on fresh cells.

^d4c/PC₇₁BM with a 1 : 1.2 weight ratio in solar cells with inverted structures with encapsulation based on aging for 3 days.

^e4c/PC₇₁BM with a 1 : 1.2 weight ratio in solar cells with inverted structures with encapsulation based on aging for 10 days.

^f4c/PC₇₁BM with a 1 : 1.2 weight ratio in solar cells with inverted structures with encapsulation based on based on aging for 30 days.