ABSTRACT
Spin-polarized carrier transport in organic semiconductors has recently become a topic of immense interest since organics exhibit extremely weak spin-orbit interaction [1,2]. e weak spin-orbit interaction is a consequence of the fact that organics are mostly hydrocarbons composed of light elements and the spin-orbit interaction strength increases with the atomic number of the nucleus. Since this interaction is usually the primary cause for spin relaxation in solids, we expect organics to exhibit long spin lifetimes, which they o en do [3]. e long spin lifetime and other attractive properties such as compatibility with exible substrates and the relative ease of synthesis [4,5] have catapulted organics to the forefront of a worldwide research enterprise dedicated to the development of a technology predicated on the utilization of the spin degree of freedom of a charge carrier in an organic molecule to store, process, and communicate information. is exciting new eld has motivated fundamental studies of the spin properties of electrons and holes in organic semiconductors, culminating in the birth of the subdiscipline known as “organic spintronics.”
