Table 2. Device Metrics^a Extracted from the J–V Characteristics Measured in Different Scan Directions at Simulated AM1.5G Illumination, 100 mW cm^–2.

HTL	scan direction	JSC [mA/cm2]	VOC [V]	FF [%]	PCE [%]	HIb
PEDOT:PSS	Reverse	19.64 (19.90 ± 0.38)	0.87 (0.81 ± 0.06)	74.23 (72.87 ± 0.91)	12.64 (11.72 ± 0.90)	0.031
	Forward	19.31 (19.68 ± 0.44)	0.83 (0.78 ± 0.04)	73.38 (73.01 ± 0.70)	11.80 (11.27 ± 0.54)
PEDOT:PSS/TACB	Reverse	20.29 (19.03 ± 0.58)	0.85 (0.80 ± 0.05)	74.86 (75.51 ± 1.47)	12.94 (11.56 ± 1.01)	0.033
	Forward	19.95 (18.86 ± 0.53)	0.84 (0.80 ± 0.04)	74.47 (74.72 ± 0.92)	12.55 (11.26 ± 0.90)
PEDOT:PSS/TTAI	Reverse	20.89 (21.29 ± 0.32)	0.91 (0.87 ± 0.05)	74.83 (73.47 ± 0.84)	14.22 (13.66 ± 0.78)	0.022
	Forward	20.67 (21.05 ± 0.30)	0.89 (0.85 ± 0.04)	74.20 (73.69 ± 0.66)	13.69 (13.20 ± 0.61)
PTAA	Reverse	22.55 (21.40 ± 0.67)	1.04 (1.02 ± 0.01)	65.33 (65.46 ± 2.18)	15.31 (14.34 ± 0.78)	0.026
	Forward	23.32 (22.97 ± 0.94)	1.05 (1.04 ± 0.01)	68.18 (67.02 ± 1.40)	16.67 (15.96 ± 0.69)
PTAA/TACB	Reverse	20.66 (19.87 ± 0.54)	1.07 (1.04 ± 0.02)	71.35 (68.95 ± 3.97)	15.85 (14.23 ± 1.13)	0.019
	Forward	21.52 (21.06 ± 0.82)	1.07 (1.05 ± 0.01)	71.18 (69.55 ± 3.60)	16.36 (15.31 ± 0.72)
PTAA/TTAI	Reverse	22.21 (21.24 ± 1.36)	1.07 (1.04 ± 0.03)	70.28 (66.68 ± 4.84)	16.66 (14.87 ± 2.16)	0.006
	Forward	22.44 (22.05 ± 0.68)	1.07 (1.05 ± 0.03)	72.95 (68.33 ± 6.42)	17.44 (15.82 ± 2.15)

^aAverage values and standard deviation are given in parentheses.

^bHysteresis index.⁶²