Table 1 Three different polymers’ parameters and their single junction devices performance when blending with PC71BM.

From: A polymer tandem solar cell with 10.6% power conversion efficiency

Polymers

LUMO (eV)

HOMO (eV)

Eg,opt (eV)

V OC (V)

JSC (mA cm−2)

FF (%)

PCE (%)

PCPDT-BT

−3.56

−5.18

1.48

0.62

11.0

50

3.4

PCPDT-DFBT

−3.52

−5.34

1.51

0.85

12.6

52

5.6

PDTP-DFBT

−3.61

−5.26

1.38

0.68

17.8

65

7.9

  1. HOMO, highest occupied molecular orbital; LUMO, lowest unoccupied molecular orbital level; PCPDT-BT, polymerpoly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)]; PCPDT-DFBT, poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]-dithiophene)-alt-4,7-(2,1,3-difluorobenzothiadiazole); PDTP-DFBT, poly[2,7-(5,5-bis-(3,7-dimethyl octyl)-5H-dithieno[3,2-b:2′,3′-d]pyran)-alt-4,7-(5,6-difluoro-2,1,3-benzothiadiazole)].
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