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De Boer, R.W.I. (author), Klapwijk, T.M. (author), Morpurgo, A.F. (author)We report on the fabrication and electrical characterization of field-effect transistors at the surface of tetracene single crystals. We find that the mobility of these transistors reaches the room-temperature value of 0.4?cm2/V?s. The nonmonotonous temperature dependence of the mobility, its weak gate voltage dependence, as well as the...journal article 2003
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- Boogaard, G.R. (author), Verbruggen, A.H. (author), Belzig, W. (author), Klapwijk, T.M. (author) journal article 2004
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- Smit, G.D.J. (author), Rogge, S. (author), Caro, J. (author), Klapwijk, T.M. (author) journal article 2004
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- Meijer, F.E. (author), Morpurgo, A.F. (author), Klapwijk, T.M. (author), Koga, T. (author), Nitta, J. (author) journal article 2004
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- Jaroszynski, J. (author), Popovic, D. (author), Klapwijk, T.M. (author) journal article 2004
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- Smit, G.D.J. (author), Rogge, S. (author), Caro, J. (author), Klapwijk, T.M. (author) journal article 2004
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- Smit, G.D.J. (author), Rogge, S. (author), Caro, J. (author), Klapwijk, T.M. (author) journal article 2004
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- Caro, J. (author), Vink, I.D. (author), Smit, G.D.J. (author), Rogge, S. (author), Klapwijk, T.M. (author), Loo, R. (author), Caymax, M. (author) journal article 2004
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- Meijer, F.E. (author), Morpurgo, A.F. (author), Klapwijk, T.M. (author), Koga, T. (author), Nitta, J. (author) journal article 2004
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Baselmans, J.J.A. (author), Hajenius, M. (author), Gao, J.R. (author), Klapwijk, T.M. (author), De Korte, P.A.J. (author), Voronov, B. (author), Gol'tsman, G. (author)We demonstrate that the performance of NbN lattice cooled hot electron bolometer mixers depends strongly on the interface quality between the bolometer and the contact structure. We show experimentally that both the receiver noise temperature and the gain bandwidth can be improved by more than a factor of 2 by cleaning the interface and adding...journal article 2004
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Jaroszynski, J. (author), Popovic, D. (author), Klapwijk, T.M. (author)Studies of low-frequency resistance noise show that the glassy freezing of the two-dimensional electron system (2DES) in Si in the vicinity of the metal-insulator transition (MIT) persists in parallel magnetic fields B of up to 9 T. At low B, both the glass transition density ng and nc, the critical density for the MIT, increase with B such that...conference paper 2004
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Baselmans, J. (author), Hajenius, M. (author), Gao, J. (author), De Korte, P. (author), Klapwijk, T. (author), Voronov, B. (author), Gol'tsman, G. (author)NbN hot electron bolometer (HEB) mixers are at this moment the best heterodyne detectors for frequencies above 1 THz. However, the fabrication procedure of these devices is such that the quality of the interface between the NbN superconducting film and the contact structure is not under good control. This results in a contact resistance between...conference paper 2004
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Klapwijk, T.M. (author), Barends, R. (author), Gao, J.R. (author), Hajenius, M. (author), Baselmans, J.J.A. (author)Improved and reproducible heterodyne mixing (noise temperatures of 950 K at 2.5 THz) has been realized with NbN based hot-electron superconducting devices with low contact resistances. A distributed temperature numerical model of the NbN bridge, based on a local electron and a phonon temperature, has been used to understand the physical...conference paper 2004
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- Tsui, Y. (author), Vitkalov, S.A. (author), Sarachik, M.P. (author), Klapwijk, T.M. (author) journal article 2005
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- Goennenwein, S.T.B. (author), Russo, S. (author), Morpurgo, A.F. (author), Klapwijk, T.M. (author), van Roy, W. (author), de Boeck, J. (author) journal article 2005
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- Tsui, Y. (author), Vitkalov, S.A. (author), Sarachik, M.P. (author), Klapwijk, T.M. (author) journal article 2005
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- Meijer, F.E. (author), Morpurgo, A.F. (author), Klapwijk, T.M. (author), Nitta, J. (author) journal article 2005
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- Russo, S. (author), Kroug, M. (author), Klapwijk, T.M. (author), Morpugo, A.F. (author) journal article 2005
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De Boer, R.W.I. (author), Iosad, N.N. (author), Stassen, A.F. (author), Klapwijk, T.M. (author), Morpurgo, A.F. (author)We investigate the effect of a small leakage current through the gate insulator on the stability of organic single-crystal field-effect transistors (FETs). We find that, irrespective of the specific organic molecule and dielectric used, leakage current flowing through the gate insulator results in an irreversible degradation of the single...journal article 2005
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Baselmans, J.J.A. (author), Baryshev, A. (author), Reker, S.F. (author), Hajenius, M. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Vachtomin, Y. (author), Maslennikov, S. (author), Antipov, S. (author), Voronov, B. (author), Gol'tsman, G. (author)We measure the direct detection effect in a small volume (0.15??m×1??m×3.5?nm) quasioptical NbN phonon cooled hot electron bolometer mixer at 1.6?THz. We find that the small signal sensitivity of the receiver is underestimated by 35% due to the direct detection effect and that the optimal operating point is shifted to higher bias voltages when...journal article 2005