Recent progress in organic spintronics

Abstract

Abstract:The field of organic spintronics deals with spin dependent phenomena occurring in organic semiconductors or hybrid inorganic/organic systems that may be exploited for future electronic applications. This includes magnetic field effects on charge transport and luminescence in organic semiconductors, spin valve action in devices comprising organic spacers, and magnetic effects that are unique to hybrid interfaces between (ferromagnetic) metals and organic molecules. A brief overview of the current state of affairs in the field is presented.

Activating the molecular spinterface

“…Accordingly, they gathered information on the energy level alignment at the interface, which is the energy barrier for carrier injection from the Fermi level of a metal into the highest occupied molecular orbital (HOMO) or lowest unoccupied molecular orbital (LUMO) levels of a molecular material 21 . Subsequent studies presented a more refined understanding of the energetics of molecular interfaces by, for instance, developing concepts such as energy level broadening or polaronic effects 23 .Although the energetics of molecular interfaces is a wide and complex topic slightly beyond the scope of this Perspective, we would like nevertheless to highlight some aspects that are relevant for interfacial spintronics 26,27 . The molecule-substrate interaction on inert surfaces such as gold is determined by weak van der Waals forces in a regime usually called physisorption.…”

“…Although the energetics of molecular interfaces is a wide and complex topic slightly beyond the scope of this Perspective, we would like nevertheless to highlight some aspects that are relevant for interfacial spintronics 26,27 . The molecule-substrate interaction on inert surfaces such as gold is determined by weak van der Waals forces in a regime usually called physisorption.…”

Functional Planar Blatter Radical through Pschorr-Type Cyclization

“…Organic radicals with π-delocalized electron spins are rapidly becoming important building blocks for modern functional materials for energy storage, − molecular electronics, − memory devices, − spintronics, − organic batteries, light-emitting diodes, , quantum information processing, biophysical applications, − and other applications. ,, Of particular interest in this context are the prototypical Blatter radical [ A (Figure )] and its derivatives. , Their exceptional stability, spin delocalization, and attractive electrochemical , and photophysical properties have recently been explored in the design of molecular electronics, controlled polymerization, and magnetic and spintronic applications and also for studies of high-spin molecular systems − and photoconductive liquid crystals. − A common feature of N(1)–aryl derivatives of radical A is the large torsion angle of the aryl group, which affects the molecular packing. This, in turn, determines the type and strength of spin–spin interactions and semiconductive properties and is unfavorable for induction of liquid crystalline properties.…”

Hot Electrons and Hot Spins at Metal–Organic Interfaces

“…Beyond the case of mere charge injection, metal–organic interfaces are intensively discussed in the context of spin injection and spin transport in organic materials . This includes the spin valve magnetoresistance effect, the level alignment or hybridization of states between metal and organic semiconductor, the introduction of interface layers, or effects of structurally more complex interfaces as well as spin filtering properties and the role of hybridization of interface states for spin filtering .…”