Energy barriers at interfaces of (100)GaAs with atomic layer deposited Al2O3 and HfO2 (2008)
Brammertz, G., Delabie, A., Sionke, S., ...
Capacitance-Voltage Characterization of GaAs-Oxide Interfaces (2008)
Brammertz, G, Lin, H C, Martens, K, Mercier, D, Merckling, C, Penaud, J, ...
We will shortly review the basic physics of charge-carrier trapping and emission from trapping states within the bandgap of a semiconductor in order to show that high-temperature capacitance-voltage...
Dynamics of nonequilibrium quasiparticles in narrow-gap superconducting tunnel junctions (2008)
Kozorezov, A.G., Hijmering, R.A., Brammertz, G., Wigmore, J.K., Peacock, A., Martin, D., ...
The latest generation of high quality, narrow gap, superconducting tunnel junctions (STJs) exhibits a steady-state and time-dependent behavior which cannot be described satisfactorily by previous...
Selective Epitaxial Growth of GaAs on Ge Substrates with a SiO2 Pattern (2007)
Brammertz, G., Caymax, M., Mols, Y., Degroote, S., Leys, M., Van Steenbergen, J., ...
We have selectively grown thin epitaxial GaAs films on Ge substrates with the aid of a 200 nm thin SiO2 mask layer. The selectively grown structures have lateral sizes ranging from 1 um width up to...
Low-temperature photoluminescence study of thin epitaxial GaAs films on Ge substrates (2006)
Brammertz, G, Mols, Yves; U0042500, Degroote, S, Motsnyi, V, Leys, M, Borghs, Gustaaf; U0009515, ...
Thin epitaxial GaAs films, with thickness varying from 140 to 1000 nm and different Si doping levels, were grown at 650 degrees C by organometallic vapor phase epitaxy on Ge substrates and analyzed...
Kozorezov, Alexander G., Wigmore, J. K., Brammertz, G., Peacock, A.
We derive expressions for phonon escape times from a thin superconducting film. The escape time is determined by the rate of scattering conversion for phonons propagating beyond the critical cone for...
This thesis describes the development of low-energy gap superconducting tunnel junctions (STJs) for use as photon detectors, with as a main goal the improvement of the energy resolution in both the...
A generalized proximity effect model in superconducting bi- and tri-layer films (2004)
Brammertz, G., Poelaert, A., Golubov, A. A., Verhoeve, P., Peacock, A., Rogalla, H.
This paper presents a general model for calculating the density of states and the Cooper pair potential in proximity coupled superconducting bi- and tri-layer films. The typical example of...
Energy-dependent kinetic model of photon absorption by superconducting tunnel junctions (2004)
Brammertz, G., Kozorezov, A. G., Wigmore, J. K., Hartog, R. Den, Verhoeve, P., Martin, D., ...
We describe a model for photon absorption by superconducting tunnel junctions in which the full energy dependence of all the quasiparticle dynamic processes is included. The model supersedes the...
Brammertz, G., Kozorezov, A. G., Hartog, R. Den, Verhoeve, P., Peacock, A., Wigmore, J. K., ...
We recently predicted the formation of a highly non-equilibrium quasiparticle (qp) distribution in low TC multiple tunnelling superconducting tunnel junctions (STJs) [1]. The situation arises through...
Optical photon detection in Al Superconducting Tunnel Junctions (2004)
Brammertz, G., Peacock, A., Verhoeve, P., Martin, D., Venn, R.
We report on the successful fabrication of low leakage aluminium superconducting tunnel junctions with very homogeneous and transparent insulating barriers. The junctions were tested in an adiabatic...
Future optical detectors based on Al superconducting tunnel junctions (2004)
Brammertz, G., Verhoeve, P., Martin, D., Peacock, A., Venn, R.
Superconducting tunnel junctions are being developed for application as photon detectors in astronomy. We present the latest results on the development of very high quality, very low critical...
Critical temperature of superconducting bilayers: theory and experiment (2004)
Brammertz, G., Golubov, A. A., Verhoeve, P., Hartog, R. Den, Peacock, A., Rogalla, H.
A generalized model for the critical temperature Tc of superconducting bilayers is presented, which is valid with no restrictions to film thicknesses, Tc of the layers and interface resistivity. The...
This thesis describes the development of low-energy gap superconducting tunnel junctions (STJs) for use as photon detectors, with as a main goal the improvement of the energy resolution in both the...
Kozorezov, Alexander G., Wigmore, J. K., Peacock, A., Den Hartog, R., Martin, D., Brammertz, G., ...
We have observed experimentally and modeled theoretically a previously unidentified nonequilibrium state in superconducting tunnel junctions. The state occurs in small gap, multiple tunneling...
Energy-dependent kinetic model of photon absorption by superconducting tunnel junctions. (2003)
Brammertz, G., Wigmore, J. K., Kozorezov , A. G., Den Hartog, R., Verhoeve , P., Martin, D., ...
We describe a model for photon absorption by superconducting tunnel junctions in which the full energy dependence of all the quasiparticle dynamic processes is included. The model supersedes the...
The X-ray response of TlBr. (2003)
Owens, Alan;, Bavdaz, M., Brammertz, G., Gostilo , V., Graafsma , H., Kozorezov, A., ...
We present the results of a series of X-ray measurements on several prototype TlBr detectors. The devices were fabricated from mono-crystalline material and were typically of size 2.7×2.7×0.8 mm3....
This thesis describes the development of low-energy gap superconducting tunnel junctions (STJs) for use as photon detectors, with as a main goal the improvement of the energy resolution in both the...
Hard X-ray spectroscopy using a small-format TlBr array. (2003)
Owens, Alan;, Bavdaz, M., Brammertz, G., Gostilo, V., Haack, N., Kozorezov, A., ...
We report X-ray measurements on a prototype 3×3 TlBr pixel array, produced to assess the technological feasibility of making a Fano limited imager, which can operate near room temperature. The...
Modelling the energy gap in transition metal/aluminium bilayers" (2002)
Brammertz, G., Golubov, A., Peacock, A., Verhoeve, P., Goldie, D. J., Venn, R.
We present an application of the generalised proximity effect theory.
Critical temperature of superconducting bilayers: THeory and experiment (2002)
Brammertz, G., Golubov, A., Verhoeve, P., Hartog, R. Den, Peacock, A., Rogalla, H.
Brammertz, G., Peacock, A., Verhoeve, P., Kozorezov, A., Hartog, R. Den, Rando, N., ...
A 6x6 array of symmetrical V/Al/AlOx/Al/V Superconducting Tunnel Junctions (STJs) was fabricated. The base electrode is a high quality epitaxial film with a residual resistance ratio (RRR) of ~30....
Development of practical soft X-ray imaging spectrometers (2001)
Brammertz, G., Verhoeve, P., Peacock, A., Martin, D., Rando, N., Hartog, R. Den, ...
Cryogenic soft X-ray imaging spectrometers are currently being developed for applications in the fields of Astronomy and material sciences. In this paper we present experiments on optimized single...
Generalized proximity effect model in superconducting bi- and trilayer films (2001)
Brammertz, G., Poelaert, P.A., Golubov, A., Verhoeve, P., Peacock, A., Rogalla, H.
Modelling the energy gap in transition metal/aluminium bilayers (2001)
Brammertz, G., Golubov, A., Peacock, A., Verhoeve, P., Goldie, D.J.