Recent and forthcoming publications in pss


Silicone oxidation for a-Si:H passivation of wafers bonded to glass

Stefano Nicola Granata, Twan Bearda, Guy Beaucarne, Yaser Abdulraheem, Ivan Gordon, Jef Poortmans, and Robert Mertens

A method to passivate the surface of a wafer/silicone/glass stack to state-of-the-art values (SRV < 4 cm/s) is presented. The method is based on an O2-plasma and an HF/TMAH/HF cleaning sequence that increase the silicone cross-linking and its resilience to processinduced degradation. The method is proven to work for three different silicone-based photovoltaic (PV) encapsulants and is believed to significantly broaden the adhesive choice for module-level processing of wafer-based silicon solar cells.

Phys. Status Solidi RRL (2014) DOI 10.1002/pssr.201409081

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Magnetotransport and magnetization dynamics of GaMnAs thin films and magnetic tunnel junctions

Aymen Ben Hamida, Sibylle Sievers, Florian Bergmann, Ana-Maria Racu, Mark Bieler, Klaus Pierz, and Hans Werner Schumacher

GaMnAs can be considered as the most prominent model system for a diluted ferromagnetic semiconductor. In this article the authors describe the comprehensive characterization of GaMnAs epitaxial thin films and magnetic tunnel junctions by complementary techniques ranging from high-resolution imaging to magnetometry, magnetotransport, time-resolved magneto-optics, and coplanar broadband ferromagnetic resonance. The combination of these different techniques allows a complete characterization of the key magnetostatic and dynamic material parameters of GaMnAs-based thin films and devices.

Phys. Status Solidi B (2014) DOI 10.1002/pssb.201350210

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Microwave permittivity and permeability of magnetic wire composites

Larissa Panina and Dmitriy Makhnovskiy

The authors provide a comprehensive review on electromagnetic properties of composites with magnetic microwires. The analysis is made in terms of the effective parameters: permittivity and permeability. The use of magnetic components in wire media makes it possible to realise controllable or tunable electromagnetic materials operating at GHz frequencies. The figure shows a resonant magnetic wire system the effective permittivity of which is controlled by applied tensile stress which rotates the magnetisation towards circular direction decreasing the high frequency impedance.

Phys. Status Solidi A (2014) DOI 10.1002/pssa.201300767

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