Table 1 Charge-transfer rates for different driving forces.

From: Sub-picosecond charge-transfer at near-zero driving force in polymer:non-fullerene acceptor blends and bilayers

Sample

λex (nm)

ES1 (eV)

ECT (eV)

−ΔE (eV)

Rise times of charges (ps)

J61:m-ITIC (1:1)

700

1.67

1.55

0.12

0.78 (−14%)

12 (−50%)

82 (−36%)

J61:m-ITIC bilayer

700

1.65

n.a

n.a.

0.92 (−17%)

46 (−83%)

PCDTBT:m-ITIC (5:1)

730

1.68

1.63

0.05

0.40 (−57%)

13 (−43%)

J61:m-ITIC (5:1)

730

1.68

1.56

0.12

0.43 (−70%)

7.8 (−30%)

PBTTT:m-ITIC (5:1)

730

1.70

1.34

0.36

0.16 (−78%)

4.0 ps (−22%)

P3HT:m-ITIC (5:1)

730

1.69

1.27

0.42

0.08 (−92%)

2.6 ps (−8%)

PCDTBT:m-ITIC (1:1)

480

1.88

1.62

0.26

<0.06 (−40%)

0.3 (−35%)

17 (−25%)

J61:m-ITIC (1:1)

480

2.00

1.55

0.45

<0.06 (−34%)

0.5 ps (−5%)

8.4 ps (−39%)

57 (−22%)

P3HT:m-ITIC (1:1)

480

2.00

1.20

0.80

<0.06 (−13%)

0.5 ps (−18%)

8.7 ps (−69%)

  1. Excited-state energy ES1 of the acceptor (700 or 730 nm excitation) or donor (480 nm excitation), CT state energy (ECT) and driving force for exciton splitting (-ΔE). The charge rise time constants (in ps) and their weight (%), obtained from the analysis of the TA data, are also shown. The first time constant (bold) corresponds to the intrinsic charge-transfer time.
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