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Mannino, Giovanni; Spinella, Corrado; Ruggeri, Rosa; La Magna, Antonino; Fisicaro, Giuseppe; Fazio, Enza; Neri, Fortunato; Privitera, Vittorio |
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Title |
Crystallization of implanted amorphous silicon during millisecond annealing by infrared laser irradiation |
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Journal Article |
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2010 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
97 |
Issue |
2 |
Pages |
3 |
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Keywords |
Annealing |
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Abstract |
We investigated the homogenous nucleation of crystalline grains in amorphous Si during transient temperature pulse of few milliseconds IR laser irradiation. The crystallized volume fraction is ~80%. Significant crystallization occurs in nonsteady regime because of the rapid temperature variation (106 °C/s). Our model combines the time evolution of the crystal grain population with the consumption of the amorphous volume due to the growth of grains. Thanks to the experimental approach based on a laser source to heat α-Si and the theoretical model we extended the description of the spontaneous crystallization up to 1323 K or 250 K above the temperature investigated by conventional annealing. |
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Annealing |
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RPLAB @ gujma @ |
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691 |
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Zwiller, Vale<cc><81>ry; Blom, Hans; Jonsson, Per; Panev, Nikolay; Jeppesen, Sören; Tsegaye, Tedros; Goobar, Edgard; Pistol, Mats-Erik; Samuelson, Lars; Björk, Gunnar |
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Title |
Single quantum dots emit single photons at a time: Antibunching experiments |
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Journal Article |
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2001 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
78 |
Issue |
17 |
Pages |
2476 |
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Keywords |
antibunching, quantum dot |
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0003-6951 |
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502 |
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Rodriguez-Morales, F.; Zannoni, R.; Nicholson, J.; Fischetti, M.; Yngvesson, K. S.; Appenzeller, J. |
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Title |
Direct and heterodyne detection of microwaves in a metallic single wall carbon nanotube |
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Journal Article |
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Year |
2006 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
89 |
Issue |
8 |
Pages |
083502 |
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Keywords |
carbon nanotube, GHz heterodyne detector, direct detector |
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565 |
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Fedorov, G.; Kardakova, A.; Gayduchenko, I.; Charayev, I.; Voronov, B.M.; Finkel, M.; Klapwijk, T.M.; Morozov, S.; Presniakov, M.; Bobrinetskiy, I.; Ibragimov, R.; Goltsman, G. |
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Title |
Photothermoelectric response in asymmetric carbon nanotube devices exposed to sub-terahertz radiation |
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Journal Article |
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2013 |
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Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
103 |
Issue |
18 |
Pages |
181121 (1 to 5) |
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Keywords |
carbon nanotubes, CNT, THz radiation, SiO2 substrate |
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We report on the voltage response of carbon nanotube devices to sub-terahertz (THz) radiation. The devices contain carbon nanotubes (CNTs), which are over their length partially suspended and partially Van der Waals bonded to a SiO2 substrate, causing a difference in thermal contact. We observe a DC voltage upon exposure to 140 GHz radiation. Based on the observed gate voltage and power dependence, at different temperatures, we argue that the observed signal is both thermal and photovoltaic. The room temperature responsivity in the microwave to THz range exceeds that of CNT based devices reported before. Authors thank Professor P. Barbara for providing the catalyst for CNT growth and Dr. N. Chumakov and V. Rylkov for stimulating discussions. The work was supported by the RFBR (Grant No. 12-02-01291-a) and by the Ministry of Education and Science of the Russian Federation (Contract No. 14.B25.31.0007). G.F. acknowledges support of the RFBR grant 12-02-01005-a. |
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0003-6951 |
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1171 |
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Kardakova, A.; Finkel, M.; Morozov, D.; Kovalyuk, V.; An, P.; Dunscombe, C.; Tarkhov, M.; Mauskopf, P.; Klapwijk, T.M.; Goltsman, G. |
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Title |
The electron-phonon relaxation time in thin superconducting titanium nitride films |
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Journal Article |
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2013 |
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Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
103 |
Issue |
25 |
Pages |
252602 (1 to 4) |
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Keywords |
disordered TiN films, electron-phonon relaxation time |
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We report on the direct measurement of the electron-phonon relaxation time, τeph, in disordered TiN films. Measured values of τeph are from 5.5 ns to 88 ns in the 4.2 to 1.7 K temperature range and consistent with a T−3 temperature dependence. The electronic density of states at the Fermi level N0 is estimated from measured material parameters. The presented results confirm that thin TiN films are promising candidate-materials for ultrasensitive superconducting detectors.
The work was supported by the Ministry of Education and Science of the Russian Federation, Contract No. 14.B25.31.0007 and by the RFBR Grant No. 13-02-91159. |
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no |
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RPLAB @ kovalyuk @ |
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941 |
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Author |
Bandurin, D. A.; Gayduchenko, I.; Cao, Y.; Moskotin, M.; Principi, A.; Grigorieva, I. V.; Goltsman, G.; Fedorov, G.; Svintsov, D. |
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Title |
Dual origin of room temperature sub-terahertz photoresponse in graphene field effect transistors |
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Journal Article |
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Year |
2018 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
112 |
Issue |
14 |
Pages |
141101 (1 to 5) |
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Keywords |
graphene field effect transistors, FET |
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Graphene is considered as a promising platform for detectors of high-frequency radiation up to the terahertz (THz) range due to its superior electron mobility. Previously, it has been shown that graphene field effect transistors (FETs) exhibit room temperature broadband photoresponse to incoming THz radiation, thanks to the thermoelectric and/or plasma wave rectification. Both effects exhibit similar functional dependences on the gate voltage, and therefore, it was difficult to disentangle these contributions in previous studies. In this letter, we report on combined experimental and theoretical studies of sub-THz response in graphene field-effect transistors analyzed at different temperatures. This temperature-dependent study allowed us to reveal the role of the photo-thermoelectric effect, p-n junction rectification, and plasmonic rectification in the sub-THz photoresponse of graphene FETs.
D.A.B. acknowledges the Leverhulme Trust for financial support. The work of D.S. was supported by Grant No. 16-19-10557 of the Russian Scientific Foundation (theoretical model). G.F., I.G., M.M., and G.G. acknowledge the Russian Science Foundation [Grant No. 14-19-01308 (MIET, cryostat upgrade) and Grant No. 17-72-30036, (MSPU, photoresponse measurements), the Ministry of Education and Science of the Russian Federation (Contract No. 14.B25.31.0007 (device fabrication) and Task No. 3.7328.2017/LS (NEP analyses)] and the Russian Foundation for Basic Research [Grant No. 15-02-07841 (device design)]. The authors are grateful to Professor M. S. Shur for helpful discussions. |
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0003-6951 |
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1309 |
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Floet, D. Wilms; Baselmans, J. J. A.; Klapwijk, T. M.; Gao, J. R. |
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Title |
Resistive transition of niobium superconducting hot-electron bolometer mixers |
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Journal Article |
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1998 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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73 |
Issue |
19 |
Pages |
2826 |
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HEB |
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0003-6951 |
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543 |
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Karasik, B. S.; Elantiev, A. I. |
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Title |
Noise temperature limit of a superconducting hot-electron bolometer mixer |
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Journal Article |
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1996 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
68 |
Issue |
6 |
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853-855 |
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HEB mixer noise temperature, Johnson noise, thermal fluctuation noise, noise bandwidth |
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0003-6951 |
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260 |
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Barends, R.; Hajenius, M.; Gao, J. R.; Klapwijk, T. M. |
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Title |
Current-induced vortex unbinding in bolometer mixers |
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Journal Article |
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2005 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
87 |
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263506 (1 to 3) |
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HEB mixer numerical model, HEB model, IV-curves, vortex-antivortex, Berezinskii–Kosterlitz–Thouless theory, diffusion cooling channel, diffusion channel, distributed HEB model, distributed model, self-heating effect, temperature profile |
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We present a description of the current-voltage characteristics of hot electron bolometers in terms of the current-dependent intrinsic resistive transition of NbN films. We find that, by including this current dependence, we can correctly predict the complete current-voltage characteristics, showing excellent agreement with measurements for both low and high bias and for small as well as large devices. It is assumed that the current dependence is due to vortex-antivortex unbinding as described in the Berezinskii–Kosterlitz–Thouless theory. The presented approach will be useful in guiding device optimization for noise and bandwidth. |
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604 |
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Karasik, B. S.; Il'in, K. S.; Pechen, E. V.; Krasnosvobodtsev, S. I. |
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Title |
Diffusion cooling mechanism in a hot-electron NbC microbolometer mixer |
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Journal Article |
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1996 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
68 |
Issue |
16 |
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2285-2287 |
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HEB mixer, diffusion cooling channel, diffusion channel |
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0003-6951 |
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262 |
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