Engineering spin propagation across a hybrid organic/inorganic interface using a polar layer

Area of Science:

• Organic electronics
• Spintronics
• Materials science

Background:

• Spintronics leverages electron spin for advanced devices, but its integration with semiconductors remains challenging.
• Organic semiconductors (OSCs) offer tunable electronic properties for new device concepts.

Purpose of the Study:

• To demonstrate control over spin polarization of charge carriers extracted from OSCs.
• To explore the use of interfacial layers for spintronic applications in organic electronics.

Main Methods:

• Incorporation of a thin interfacial layer of polar material between an OSC and a ferromagnetic contact.
• Modulation of the OSC highest occupied molecular orbital (HOMO) energy level relative to the ferromagnetic contact's Fermi energy via the interfacial layer's electric dipole moment.

Main Results:

• Successful control of spin polarization for charge carriers extracted from OSCs.
• Demonstration of a method to tune spin-dependent charge extraction through interfacial engineering.

Conclusions:

• The interfacial polar layer effectively controls spin polarization, enabling selective charge carrier extraction.
• This approach opens new avenues for developing advanced organic spintronic devices.