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

From: A molecular nematic liquid crystalline material for high-performance organic photovoltaics

Jsc (mA cm−2)

V oc (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)

—

—

  
  1. FF, fill factor; PCE, power conversion efficiency; SCLC, space-charge-limited current; SVA, solvent vapour annealing; THF, tetrahydrofuran.
  2. 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.
  3. *Series resistance of the device.
  4. †Shunt resistance of the device.
  5. ‡Charge mobility values obtained from SCLC experiments.
  6. §Cells were tested in air with encapsulation, illumination intensity was 98 mW cm−2.
  7. ||Cells without encapsulation were tested in a glove box filled with dry nitrogen; illumination intensity was 100 mW cm−2.
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