Physical properties of 66BT, 44BT and 44TT.

Polymer	λ max a (nm)	λ max b (nm)	E opt c (eV)	E HOMO c (eV)	E LUMO d (eV)
66BT	487	503	2.06	−5.30	−3.24
44BT	487	496	2.08	−5.30	−3.22
44TT	483	505	2.05	−5.40	−3.35
P3HT	451	505	1.85	−5.05	−3.20
ITIC	676	707	1.70	−5.75	−4.05

^aDetermined using the absorption profiles of solution samples in chloroform.

^bDetermined from the as-cast thin films.

^cDetermined using cyclic voltammetry curves of the thin films.

^dDetermined using a combination of the optical band-gap and the HOMO energy levels obtained from CV measurements of thin film samples.