Table 1 Charge-carrier mobility and Langevin prefactors of PM6-based and PBDB-T-based devices.

From: Reduced bimolecular charge recombination in efficient organic solar cells comprising non-fullerene acceptors

Blend films

µn (m2 V−1 s−1)

µp (m2 V−1 s−1)

γlight

γdark

γanalytical

PM6:PC61BM

3.0 (± 1.0) × 10–8

3.0 (± 1.0) × 10–8

0.15

0.2

0.3

PM6:IT-4F

2.5 (± 0.5) × 10–8

2.0 (± 0.5) × 10–8

0.015

0.03

0.03

PM6:Y6

3.0 (± 0.8) × 10–8

2.0 (± 1.0) × 10–8

0.015

0.02

0.02

PBDB-T:O-IDTBR

4.5 (± 1.5) × 10–8

7.0 (± 3.0) × 10–8

0.25

0.2

0.1 – 1

PBDB-T:IE4F-S

1.0 (± 0.5) × 10–8

6.0 (± 2.0) × 10–9

0.002

0.007

0.006

  1. The Langevin prefactors γlight and γdark are obtained by fitting the J-V characteristics of double-carrier devices under illumination and in dark, respectively, based on the experimental mobilities as obtained from single-carrier devices. The Langevin prefactor γanalytical is obtained via Eq. (2).
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