ABSTRACT
In this chapter, we review various aspects of the effects of magnetic fields in devices and films based on organic semiconductors with low carrier mobility. We summarize low and high magnetic field experimental studies of magneto-conductance and magneto-electroluminescence in organic light emitting diodes; magneto-photo-conductance in organic photovoltaic cells based on donor–acceptor blends and in organic diodes made of homo-polymers. In addition to magnetic field effects in devices, studies of magneto-photoluminescence and magneto-photoinduced absorption in films of organic semiconductors are also described. Our review includes both time dependent and steady state investigations. We use simplified theoretical models in which the spin degrees of freedom are solely responsible for the magnetic field effects, and show that most of the experimental results can be accounted for by these models. In particular, these models can explain the low and high field response in the steady state and transient regime.
