Table 1 Summary of the mechanical parameters from the stress-strain characterizations.

From: Multi-scale mechanical properties of bulk-heterojunction films in polymer solar cells

Donor

Acceptor

Modulusa (GPa)

Fracture strainb (%)

Toughnessc (MJ m–3)

PM6

PC71BM

1.22 ± 0.20

2.7 ± 0.8

0.34 ± 0.10

Y6

0.61 ± 0.19

5.5 ± 0.9

0.90 ± 0.18

PRi-C39

0.33 ± 0.04

35.1 ± 6.9

5.44 ± 0.87

PTB7-Th

PC71BM

0.44 ± 0.07

1.7 ± 0.1

0.09 ± 0.03

Y6

0.21 ± 0.06

3.0 ± 0.4

0.13 ± 0.06

PRi-C39

0.10 ± 0.02

24.3 ± 6.3

1.85 ± 0.51

D18-Cl

PC71BM

1.06 ± 0.20

2.0 ± 0.2

0.28 ± 0.02

Y6

0.83 ± 0.11

4.6 ± 0.8

0.59 ± 0.09

PRi-C39

0.24 ± 0.01

33.9 ± 7.1

6.73 ± 1.24

  1. aDerived from the linear regime of the stress-strain curves using the Hooke’s law.
  2. bObtained from the stress at failure.
  3. cCalculated by integrating the area under the stress-strain curve.
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