Fig. 2
From: Elementary steps in electrical doping of organic semiconductors
Absorption spectroscopy on p-doped films. Normalized absorption spectra of a ZnPc:F6-TCNNQ and b MeO-TPD:F6-TCNNQ thin films of varying doping ratio measured at RT, evidencing integer-charge transfer (ICT) each. c, d Respective transmission spectra of representative doped films under temperature variation (T = 10… 300 K). Spectra of undoped ZnPc and MeO-TPD films are given as dash-dotted lines. Energy values are as follows: IEUPS(ZnPc) = 5.0 eV, IEUPS(MeO-TPD) = 5.1 eV, and EADFT(F6-TCNNQ) = 5.2 eV15, the corresponding molecular structures are given in panel c and d
