Topic : Spin Transport in Organic Semiconductors
Date & Time : 6th February 2020 at 4.00 p.m.
Venue : SSCU Auditorium

In the past few decades, spin-related phenomena in organic semiconductors have garnered considerable attention1. Particularly, most studies on spin transport are conducted by utilizing π-conjugated molecule-based spin valve. The devices based on spin transport shows a typical geometry with a thin-film molecular layer sandwiched between two ferromagnetic electrodes2,3. In such a device, spin transport plays a crucial role in understanding the mechanism of spin-related phenomena4. In my talk, I will primarily highlight the origin of long spin relaxation times based on week spin-orbit coupling and hyperfine interactions, which includes its potential application in OLEDs and structural property correlation that can serve as a guideline for the development of efficient organic spintronic devices.

1. Wohlgenannt, M. Organic magnetoresistance and spin diffusion in organic semiconductor thin film devices. Phys. status solidi – Rapid Res. Lett. 6, 229–242 (2012).
2. Xiong, Z. H., Wu, D., Vardeny, Z. V. & Shi, J. Giant magnetoresistance in organic spin-valves. Nature 427, 821–824 (2004).
3. Dediu, V. A., Hueso, L. E., Bergenti, I. & Taliani, C. Spin routes in organic semiconductors. Nat. Mater. 8, 707–716 (2009).
4. Bobbert, P. A., Wagemans, W., Van Oost, F. W. A., Koopmans, B. & Wohlgenannt, M. Theory for spin diffusion in disordered organic semiconductors. Phys. Rev. Lett. 102, (2009).