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Wyszukujesz frazę "79.60.Jv" wg kryterium: Temat


Tytuł:
Growth of β-$Ga_2O_3$ Nanorods and Photoluminescence Properties
Autorzy:
Zhang,, S.
Zhuang, H.
Xue, C.
Li, B.
Shen, J.
Wang, D.
Powiązania:
https://bibliotekanauki.pl/articles/1814023.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.65.-k
79.60.Jv
81.15.Cd
Opis:
β-$Ga_2O_3$ nanorods were successfully fabricated through annealing $Ga_2O_3$/Mo films deposited on the Si (111) substrate by radio frequency magnetron sputtering technique. The morphology and structure of the as-synthesized nanorods were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and energy dispersive X-rays spectroscopy. The results show that the formed nanorods are single-crystalline $Ga_2O_3$ with monoclinic structure. The diameters of nanorods are 200 nm and lengths typically up to several micrometers. A photoluminescence spectrum at room temperature under excitation at 325 nm exhibits two strong blue-light peaks located at about 413.0 nm and 437.5 nm, attributed to the recombination of bound electron-hole exciton in β-$Ga_2O_3$ single crystal. The growth process of the β-$Ga_2O_3$ nanorods is probably dominated by conventional vapor-solid mechanism.
Źródło:
Acta Physica Polonica A; 2007, 112, 6; 1195-1201
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoelectron Spectroscopy of II-VI Semiconductor Heterostructures
Autorzy:
Wörz, M.
Hampel, M.
Flierl, R.
Gebhardt, W.
Powiązania:
https://bibliotekanauki.pl/articles/1952740.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Jv
Opis:
We are growing ZnSe, ZnS and CdSe layers epitaxially on GaAs(001) substrates by atomic layer epitaxy and molecular beam epitaxy. The substrates are prepared by a H-plasma method in order to obtain a sharp interface between substrate and layer. The quality of our samples is controlled by reflection high energy diffraction and X-ray diffraction. Furthermore, the samples are characterized in situ by photoelectron spectroscopy. We observe resonant Zn 3d$\text{}^{8}$ and Cd 4d$\text{}^{8}$ satellites, which are used to check the layer quality. As a result, the valence band offsets of CdSe/ZnSe and ZnSe/CdSe were obtained. The values are ΔE$\text{}_{v}$(ZnSe/CdSe) = -(0.13 ± 0.07) eV and ΔE$\text{}_{v}$(CdSe/ZnSe) = -(0.13 ± 0.07) eV, which confirm the commutativity rule.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 1113-1117
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation Histograms in Conductance Measurements of Nanowires Formed at Semiconductor Interfaces
Autorzy:
Wawrzyniak, M.
Martinek, J.
Susła, B.
Ilnicki, G.
Powiązania:
https://bibliotekanauki.pl/articles/1810603.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.65.-k
79.60.Jv
73.63.Rt
Opis:
We demonstrate experimentally that conductance steps can occur in nanowires formed at metal-semiconductor junctions, between a cobalt tip and a germanium surface revealing long-duration plateaus at reproducible levels. The high reproducibility of the conductance traces obtained leads to very sharp peaks in the conductance histogram suggesting formation of stable atomic configurations. We develop a new type of correlation analysis of the preferred conductance values that provide new type of information on a few-atomic-nanocontact formation dynamics.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 384-386
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current-Voltage Characteristics of Nanowires Formed at the $Co-Ge_{99.99}Ga_{0.01}$ Interface
Autorzy:
Wawrzyniak, M.
Maćkowski, M.
Śniadecki, Z.
Idzikowski, B.
Martinek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1537104.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.65.-k
79.60.Jv
73.63.Rt
Opis:
We present a method of measurement of the current-voltage (I-V) and conductance-voltage (G-V) characteristics of nanowires with quantum point contact formed at the $Co-Ge_{99.99}Ga_{0.01}$ interface. The effect of the Fermi level pinning leads to the formation of an ohmic contact between Co and $Ge_{99.99}Ga_{0.01}$. On the measured characteristics, above the threshold value of voltage an exponential current growth is observed. Such effect could be useful in the production of the electronic nanodevices.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 375-378
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanostructured W-Cu Electrical Contact Materials Processed by Hot Isostatic Pressing
Autorzy:
Tsakiris, V.
Lungu, M.
Enescu, E.
Pavelescu, D.
Dumitrescu, Gh.
Radulian, A.
Mocioi, N.
Powiązania:
https://bibliotekanauki.pl/articles/1194884.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Ni
81.05.Mh
79.60.Jv
81.20.Ev
Opis:
Nanostructured W-Cu-Ni electrical contact materials to be used in low voltage vacuum switching contactors for nominal currents up to 630 A were developed successfully by hot isostatic pressing. W-Cu-Ni composite powder mixtures with copper content of 20 to 40 wt% and 1 wt% Ni were mechanically alloyed in Ar atmosphere by high-energy ball milling with a ratio of milling steel balls: powders mixtures of 8:1 and rotation speed of 400 rpm for 10 and 20 h. The effect of mechanical alloying on the sintering response of composite compacts was investigated. Also, the sintered contacts were characterized from the point of view of physical, microstructural, mechanical, and functional properties. The nanostructured electrical contacts presented very good sinterability and homogeneous structures with a maximum compactity degree of about 89%. The best W-Cu-Ni compositions with relative density of about 80%, chopping currents lower than 5 A, copper content lower than 40% as W-20Cu-1Ni (10 h of mechanical alloying and 20 h of mechanical alloying) and W-30%Cu-Ni (10 h of mechanical alloying) were selected to be used in vacuum contactors.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 348-352
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Properties of SbSI/Sb_2S_3 Single and Double Heterostructures
Autorzy:
Toroń, B.
Nowak, M.
Grabowski, A.
Kępińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399098.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.78.Fk
79.60.Jv
73.40.-c
78.66.-w
Opis:
The $SbSI//Sb_2S_3$ single heterostructures as well as $Sb_2S_3//SbSI//Sb_2S_3$ and $SbSI//Sb_2S_3/SbSI$ double heterostructures have been produced by applying $CO_2$ laser treatment of p-type SbSI single crystals. The current-voltage and transient characteristics of these heterostructures have been measured in temperatures below and above the SbSI single crystal Curie temperature $(T_{c} = 293 K)$. The results have been fitted with appropriate theoretical formulae to determine the following types of the investigated heterojunctions: P-p $SbSI//Sb_2S_3$, p-P-p $Sb_2S_3//SbSI//Sb_2S_3$ and P-p-P $SbSI//Sb_2S_3//SbSI$. Influence of the illumination on electrical properties of $SbSI//Sb_2S_3$ single and double heterostructures has been reported. Fabricated new structures may be potentially applicable in electronics and optoelectronics as a new type of metal-ferroelectric-semiconductor devices.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 830-832
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoexcitation Spectroscopy and Material Alteration with Free-Electron Laser
Autorzy:
Sturmann, J.
Albridge, R. G.
Barnes, A. V.
Gilligan, J.
Graham, M. T.
Mckinley, J. T.
Ueda, A.
Wang, W.
Yang, X.
Tolk, N. H.
Davidson, J. L.
Margaritondo, G.
Powiązania:
https://bibliotekanauki.pl/articles/1963341.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.La
79.20.Ds
63.20.-e
79.60.Jv
73.20.At
Opis:
As synchrotron radiation sources have been used for many experiments in the ultraviolet and X-ray regimes, the free-electron laser is an excellent source for a wide array of infrared-photon projects and applications. The free-electron laser delivers a beam of powerful tunable pulsed radiation which provides the opportunity for spatial and temporal localization of the energy delivered at any desired wavelength within the 2-10 μ regime. One application discussed employs the free-electron laser for spectroscopy as a probe of electronic and vibrational structures. Another application uses the free-electron laser beam as a tool for altering materials in a fundamentally new way.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 689-696
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Layered Semiconductors and Related Systems
Autorzy:
Starnberg, H.
Powiązania:
https://bibliotekanauki.pl/articles/2027481.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Nr
71.20.Tx
79.60.Bm
79.60.Jv
Opis:
The general properties of the layered transition metal dichalcogenides and the possibility to modify these materials by intercalation are reviewed. Examples are given of experimental results obtained by using angle-resolved photoelectron spectroscopy and very-low-energy electron diffraction. The possibility to use layered semiconductors as model systems in studies of e.g. Schottky barriers and surface photovoltage is exemplified by the Rb/WSe$\text{}_{2}$ system. Attention is also paid to the use of van der Waals epitaxy in interface studies, and its possible practical applications. The potential of layered semiconductors like WSe$\text{}_{2}$ in solar cell applications is also mentioned.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 301-318
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrared Detectors for the Future
Autorzy:
Rogalski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1807754.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Pw
07.57.Kp
73.21.Cd
78.67.Pt
79.60.Jv
Opis:
In the paper, fundamental and technological issues associated with the development and exploitation of the most advanced infrared detector technologies are discussed. In this class of detectors both photon and thermal detectors are considered. Special attention is directed to HgCdTe ternary alloys on silicon, type-II superlattices, uncooled thermal bolometers, and novel uncooled micromechanical cantilever detectors. Despite serious competition from alternative technologies and slower progress than expected, HgCdTe is unlikely to be seriously challenged for high-performance applications, applications requiring multispectral capability and fast response. However, the nonuniformity is a serious problem in the case of LWIR and VLWIR HgCdTe detectors. In this context, it is predicted that type-II superlattice system seems to be an alternative to HgCdTe in long wavelength spectral region. In well established uncooled imaging, $VO_x$ microbolometer arrays are clearly the most used technology. In spite of successful commercialization of uncooled microbolometers, the infrared community is still searching for a platform for thermal imagers that combine affordability, convenience of operation, and excellent performance. Recent advances in microelectromechanical systems have led to the development of uncooled IR detectors operating as micromechanical thermal detectors. Between them the most important are biomaterial microcantilevers.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 389-406
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoemission Electronic Spectra οf CdTe/$Pb_{0.95}Eu_{0.05}Te$/CdTe
Autorzy:
Orlowski, B.
Dziawa, P.
Gas, K.
Reszka, A.
Mickievicius, S.
Thiess, S.
Drube, W.
Powiązania:
https://bibliotekanauki.pl/articles/1492971.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Jv
71.20.Mq
73.40.-c
Opis:
The synchrotron radiation was used to apply tunable high energy X-ray photoemission spectroscopy for investigation of electronic structure of semiconductor nanostructure CdTe/$Pb_{0.95}Eu_{0.05}Te$/CdTe/GaAs(001) top part. The $Pb_{0.95}Eu_{0.05}Te$ (6 nm thick) was buried under thin (22 nm) top layer of CdTe transparent for part of electrons photoemitted from $Pb_{0.95}Eu_{0.05}Te$ buried layer. The top layer of CdTe was sputtered by Ar ion bombardment for surface cleaning and for leaving the thickness of CdTe more transparent for photoelectrons emitted from buried layer. For these thickness of the top layer the photoemission energy distribution curves corresponding to the valence band and core levels electrons of the buried layer atoms were measured with application of synchrotron radiation of energy hν = 3510 eV. The measured spectra corresponding to the buried layer atoms were observed in the valence band region and in the high binding energy region for core levels of Pb 4f, Pb 3d. The valence band contribution and core levels Cd 4d and Cd 3d were obtained mainly from top cover layer. Measured Te 4d, Te 3d and Te 4d spectra possess contribution as well from top cover layer as from the buried layer. The amount of Eu atoms was to small to be reasonable detected and presented in the paper.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 960-963
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of TDMAAs Acceptor Precursor on Performance Improvement of HgCdTe Photodiodes
Autorzy:
Madejczyk, P.
Gawron, W.
Piotrowski, A.
Kłos, K.
Rutkowski, J.
Rogalski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1506804.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Pw
07.57.Kp
73.21.Cd
78.67.Pt
79.60.Jv
Opis:
One of the key factor which determine HgCdTe photodiode quality is acceptor doping efficiency. This paper presents significant progress made over the past three years in development of acceptor doping technology in metalorganic chemical vapour deposition HgCdTe photovoltaic detectors. High acceptor doping is required for $P^{+}$-contact layers, whereas low doping is necessary for p-type absorbing base layer. Previously, $AsH_3$ precursor was used as an acceptor dopant. This precursor is partially incorporated as electrically neutral As-H pairs, which are likely to be recombination centres in HgCdTe and in consequence influence on the carriers lifetime lowering. Substituting of $AsH_3$ by TDMAAs resulted in higher carrier lifetimes and thereby about one order of magnitude higher $R_0A$ product of HgCdTe photodiodes in temperatures close to 230 K.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1199-1204
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cd$\text{}_{1-x}$Fe$\text{}_{x}$Se/Fe Interface Formation Observed by Means of Photoemission Spectroscopy
Autorzy:
Guziewicz, E.
Orłowski, B. A.
Kowalski, B. J.
Barrett, N.
Martinotti, D.
Guillot, C.
Lacharme, J.-P.
Sebenne, C. A.
Powiązania:
https://bibliotekanauki.pl/articles/1950803.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.-r
79.60.Jv
Opis:
We present a new outlook at the study of metal-semiconductor interface formation. A resonant photoemission spectroscopy tuned to the Fe 3p-3d transition (56 eV) was used to investigate the changes after sequential deposition of Fe atoms on freshly cleaved Cd$\text{}_{0.86}$Fe$\text{}_{0.14}$Se crystal surface. In the first stages (0.6-4 ML) of Fe deposition the contribution of Fe 3d electrons to the valence band grows up markedly indicating the increase in Fe content in the Cd$\text{}_{0.86}$Fe$\text{}_{0.14}$Se crystal surface region. When the amount of Fe exceed 40 ML the resonant photoemission spectra became similar to the Fe metal with some contribution of the ternary crystal substrate.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 805-808
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zn(Mn)O Surface Alloy Studied by Synchrotron Radiation Photoemission
Autorzy:
Guziewicz, E.
Kopalko, K.
Sadowski, J.
Guziewicz, M.
Golacki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2043720.pdf
Data publikacji:
2005-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.-r
79.60.-i
79.60.Jv
Opis:
The Mn/ZnO(0001) system was investigated by synchrotron radiation photoemission. The Mn/ZnO interface with 4 ML of manganese deposited onto the ZnO surface was annealed up to 500ºC. No Mn capping layer was found at the surface after annealing as was confirmed by scanning Auger spectroscopy experiment. We used a resonant photoemission to extract the Mn3d partial density of states in photoemission spectra. The Mn3d states contribute to the electronic structure of the system within 10 eV of the Fermi level. They show three features: a main peak at 3.8-4.5 eV, a valence structure at the top of the valence band (1-3 eV), and a broad satellite situated between 5.5 and 9 eV below E$\text{}_{F}$. The satellite/main branching ratio was determined to be 0.43, which is a fingerprint of strong hybridization between the Mn3d electrons and the valence band of the crystal. The hybridization effect in Zn$\text{}_{1-x}$ Mn$\text{}_{x}$O surface alloy is comparable to Zn$\text{}_{1-x}$Mn$\text{}_{x}$S and much higher than in Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se, Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te, and Ga$\text{}_{1-x}$Mn$\text{}_{x}$As semimagnetic compounds.
Źródło:
Acta Physica Polonica A; 2005, 108, 4; 689-696
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CO-induced photoemission structures of the CO/Pt/Ru(0001) interface
Autorzy:
Godowski, P.J.
Onsgaard, J.
Li, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1058526.pdf
Data publikacji:
2016-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Jv
33.60.+q
82.80.Pv
Opis:
The CO/Pt/Ru(0001) interface has been re-examined, in great detail, by photoelectron spectroscopy of high resolution under UHV conditions. The Ru(0001) substrate has been modified by platinum at coverages less than corresponding to the one, saturated, Pt overlayer, with no Pt/Ru intermixing. The analysis of the extent to which different regions of the photoelectron spectrum allow a detailed characterization of the interface is presented. The CO adsorption displays interaction with two separate phases: the Pt(111) face and the Ru(0001) surface.
Źródło:
Acta Physica Polonica A; 2016, 130, 6; 1389-1394
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoemission Study of Co Adsorbed on K/Cu(110). Analysis of Adsorbate Induced Structures
Autorzy:
Godowski, P. J.
Onsgaard, J.
Christensen, S. V.
Nerlov, J.
Powiązania:
https://bibliotekanauki.pl/articles/1945414.pdf
Data publikacji:
1996-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Jv
33.60.-q
82.80.Pv
Opis:
Improved adsorption characteristics of a K predosed Cu(110) surface with a coverage corresponding to a point before the work function minimum have been confirmed. Analysis of the CO-induced orbitals in the photoelectron spectra of the CO/K/Cu(110) interface for low coverages of carbon monoxide adsorbed at 118 K has been done. Noticeable changes of the parameters of the orbitals with increasing CO coverage have been registered. Elongation of the C-O bond without dissociation of the molecule has been deduced from the energetic separation of 3.4 eV between the 4σ and the 1π orbital. A weakening of the CO-interface bond with coverage has been found on the base of decreasing 5σ-1π separation with increasing 4σ/5σ intensity ratio. Perpendicular orientation of CO molecules to the plane of the substrate surface has been concluded from analysis of the constant initial state spectra of the 4σ and 5σ/1π orbitals.
Źródło:
Acta Physica Polonica A; 1996, 89, 5-6; 657-664
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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