Table 1 Voltage loss values from the subgap \({{{{{\rm{EQE}}}}}}\) measurements for the solar cells based on DCDA polymers.

From: Increasing donor-acceptor spacing for reduced voltage loss in organic solar cells

 

\({V}_{{{{{{{\mathrm{OC}}}}}}}}\) (V)

\({E}_{{{{{{{\mathrm{CT}}}}}}}}\,\)(eV)

\({V}_{{{{{{{\mathrm{loss}}}}}}}}\)a (V)

\({V}_{{{{{{{\mathrm{OC}}}}}}},{{{{{{\mathrm{rad}}}}}}}}\)b (V)

\({\varDelta V}_{{{{{{{\mathrm{nr}}}}}}}}\)c (V)

\({\varDelta V}_{{{{{{\mathrm{r}}}}}}}\)d (V)

PBDB-T-NDI(C6)

0.66

1.48

0.82

1.22

0.56

0.26

PBDB-T-NDI(C12)

0.76

1.49

0.73

1.25

0.49

0.24

PBDB-T-NDI(C18)

0.81

1.51

0.70

1.25

0.44

0.26

  1. JV curves and the photovoltaic performance parameters of the solar cells are provided in Supplementary Note 9.
  2. aCalculated using eq. \({V}_{{{{{{{\mathrm{loss}}}}}}}}={E}_{{{{{{{\mathrm{CT}}}}}}}}/q-{V}_{{{{{{{\mathrm{OC}}}}}}}}\), the method used to determine \({E}_{{{{{{{\mathrm{CT}}}}}}}}\) is provided in Supplementary Note 5.
  3. bCalculated from the radiative limit for the dark saturation current, details in Supplementary Note 6.
  4. cCalculated using eq. \({\varDelta V}_{{{{{{{\mathrm{nr}}}}}}}}={V}_{{{{{{{\mathrm{OC}}}}}}},{{{{{{\mathrm{rad}}}}}}}}-{V}_{{{{{{{\mathrm{OC}}}}}}}}\); \({\varDelta V}_{{{{{{{\mathrm{nr}}}}}}}}\) values are also verified by measuring \({{{{{{\rm{EQE}}}}}}}_{{{{{{\rm{EL}}}}}}}\), details in Supplementary Note 6.
  5. dCalculated using eq. \({\varDelta V}_{{{{{{\mathrm{r}}}}}}}={V}_{{{{{{{\mathrm{loss}}}}}}}}-{\varDelta V}_{{{{{{{\mathrm{nr}}}}}}}}.\)
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