Charge Injection into Organic Semiconductors

Abstract

In this work, the dependence of injection on the degree of doping of an organic semiconductor was studied. A model organic semiconductor, tetra-methyl triphenyl diamine doped polycarbonate (PC:TMTPD) was used for these experiments. By substituting TMTPD molecules with a TMTPD+SbF6- salt, the degree of doping in the organic semiconductor was systematically varied. Changes in the electrical characteristics of devices with various electrodes were analyzed to yield the dependence of injection on the degree of doping. Along with the doping concentration, the temperature and distance between electrodes was also varied. This provided a better understanding of how doping, temperature and electrode spacing affect device performance.