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Related Experiment Video

Updated: Jul 3, 2026

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

Published on: March 2, 2021

Large spin diffusion length in an amorphous organic semiconductor.

J H Shim¹, K V Raman, Y J Park

¹Francis Bitter Magnet Laboratory, MIT, Cambridge, Massachusetts 02139, USA.

Physical Review Letters

|July 23, 2008

Summary

This summary is machine-generated.

Researchers measured a spin diffusion length of 13.3 nm in amorphous organic semiconductor rubrene using spin-polarized tunneling. This finding highlights the potential of organic spintronics due to the absence of defects.

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Area of Science:

Materials Science
Condensed Matter Physics
Organic Electronics

Background:

Spin transport in amorphous materials is crucial for spintronics.
Amorphous silicon and germanium show no spin-conserved transport.
Organic semiconductors offer potential for defect-free spin transport.

Purpose of the Study:

To directly measure the spin diffusion length in amorphous organic semiconductor rubrene.
To investigate the role of defects in spin transport.
To explore the potential of organic materials for spintronics applications.

Main Methods:

Direct measurement of spin diffusion length using spin-polarized tunneling.
Fabrication of amorphous organic semiconductor barriers.
Growth of rubrene barriers on a seed layer to enhance tunneling.

Main Results:

A spin diffusion length (λs) of 13.3 nm was directly measured in amorphous rubrene (C42H28).
Absence of dangling bond defects in amorphous organic semiconductors explains observed spin transport behavior.
Enhanced elastic tunneling characteristics were observed when rubrene barriers were grown on a seed layer.

Conclusions:

Amorphous organic semiconductors exhibit promising spin transport properties.
The absence of defects is key to achieving efficient spin transport in these materials.
Further development could lead to millimeter-scale spin diffusion lengths in crystalline rubrene, advancing organic spintronics.