Spins in Organic Semiconductor Nanostructures

Authored by: Sandipan Pramanik , Bhargava Kanchibotla , Supriyo Bandyopadhyay

1 Handbook of Nanophysics

Print publication date:  September  2010
Online publication date:  September  2010

Print ISBN: 9781420075403
eBook ISBN: 9781420075410
Adobe ISBN:

10.1201/9781420075410-34

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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]. The 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 often do [3]. The long spin lifetime and other attractive properties such as compatibility with flexible 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. This exciting new field 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.”

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