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(Color online) (a) UPS spectra of a PEDOT:PSS substrate and a PFO overlayer along with the derived parameters: , , , and IP . (b) Band diagram of PFO on PEDOT:PSS, as derived from (a). Note that can be positive or negative in value.
(Color online) Characteristics of PFO films ( in thickness) cast on top of PEDOT:PSS films with thicknesses of (a) , (b) , and (c) , or (d) on bare ITO.
(Color online) HOMO edge spectra by UPS of two PFO films (1 and in thickness, respectively) cast on top of PEDOT:PSS film thickness ranging from 15, 25, to , and also of PFO film cast on Au. The peak near , representing delocalized states in PFO, broadens and shifts towards with increasing PEDOT:PSS film thickness.
(Color online) (a) Hole-dominated devices [ITO/PEDOT:PSS/PFO ] with different PEDOT:PSS thicknesses. PEDOT:PSS is taken as the anode and in the inset bare ITO is taken as the anode. [(b) and (c)] The performance of the bipolar devices ITO/PEDOT:PSS/PFO with the PEDOT:PSS film thickness ranging from 15, 25, to .
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