Table 1. Photovoltaic parameters of BTR:PC₇₁BM BHJ solar cells fabricated and tested under different conditions.

Jsc (mA cm−2)	Voc (V)	FF (%)	PCE (%)	Rs* (Ω cm2)	Rsh† (MΩ cm2)	μh‡ (cm2 V−1 s−1)	μe‡ (cm2 V−1 s−1)
As-cast§
11.64	0.96	47	5.2	14.0	5.5	2.2 × 10−4	3.5 × 10−4
(11.20±0.51)	(0.96±0.01)	(42±3)	(4.5±0.4)	—	—
THF SVA§
13.52	0.89	73	8.7	2.4	42
[12.16]	[0.90]	[76]	[8.3]	2.2	6.4
(13.17±0.43)	(0.89±0.01)	(71±2)	(8.3±0.2)	—	—	1.6 × 10−3	9.6 × 10−3
THF SVA||
13.90	0.90	74	9.3	2.7	15
[13.40]	[0.90]	[77]	[9.3]	1.9	20
(13.61±0.16)	(0.89±0.01)	(74±1)	(8.9±0.2)	—	—

FF, fill factor; PCE, power conversion efficiency; SCLC, space-charge-limited current; SVA, solvent vapour annealing; THF, tetrahydrofuran.

Data in brackets show the cell with the highest FF. Data in parentheses are average results out of 40+ encapsulated devices tested in air or 28 non-encapsulated devices tested in nitrogen.

^*Series resistance of the device.

^†Shunt resistance of the device.

^‡Charge mobility values obtained from SCLC experiments.

^§Cells were tested in air with encapsulation, illumination intensity was 98 mW cm⁻².

^||Cells without encapsulation were tested in a glove box filled with dry nitrogen; illumination intensity was 100 mW cm⁻².