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Interface formation between calcium and electron-irradiated poly(3-hexylthiophene).

Fabian Bebensee¹, Junfa Zhu, Jack H Baricuatro

¹Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany.

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Summary

Electron irradiation of poly(3-hexylthiophene) (P3HT) increases calcium (Ca) sticking probability but doesn't significantly alter its reaction behavior. Ca adsorption on P3HT involves surface diffusion, CaS cluster formation, and 3D island growth, with minor effects from electron damage.

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Area of Science:

Materials Science
Surface Science
Polymer Science

Background:

Poly(3-hexylthiophene) (P3HT) is a conductive polymer with potential applications in electronics.
Understanding metal-polymer interactions is crucial for device fabrication and performance.
Electron irradiation can modify polymer surface properties, potentially altering metal adsorption behavior.

Purpose of the Study:

To investigate the adsorption of calcium (Ca) on electron-irradiated P3HT surfaces.
To compare the adsorption behavior on pristine and electron-damaged P3HT.
To elucidate the effects of electron-induced surface modifications on Ca reaction and growth.

Main Methods:

Adsorption microcalorimetry
Atomic beam/surface scattering
X-ray photoelectron spectroscopy (XPS)
Low-energy He(+) ion scattering spectroscopy (LEIS)

Main Results:

Electron irradiation significantly increases the fraction of unsaturated carbon atoms in P3HT without sulfur loss.
Initial sticking probability of Ca on irradiated P3HT (0.63) is higher than on pristine P3HT (0.36).
Ca adsorption involves subsurface diffusion and CaS cluster formation, followed by 3D island growth, with heat of adsorption largely independent of electron damage except at very low coverages.

Conclusions:

Electron irradiation enhances Ca sticking on P3HT due to increased unsaturated carbon bonds.
The fundamental Ca adsorption, reaction, and growth mechanisms on P3HT remain largely unaffected by electron damage.
Weakly bound Ca adatoms on damaged surfaces exhibit longer residence times, influencing adsorption kinetics.