Optoelectronic properties of DTA and the DBTA derivatives.

Compound	HOMOfilma/eV	E ox p b/V	E opt g c/eV
DTA	−5.36	0.62	2.66
EBDBTA	−5.39	0.44	2.42
C4DBTA	−4.91	0.43	2.39
C6DBTA	−5.00	0.43	2.39
C8DBTA	−5.02	0.43	2.39

^aHOMO in the thin-film state determined from the IE measured by PESA.

^bPotential of the first oxidation peak measured by DPV. Values are vs. the Fc/Fc⁺ redox couple.

^cAbsorption-onset energy of thin films.