Temat: 71.55.Gs - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Deep Levels in Cd$\text{}_{0.99}$Mn$\text{}_{0.01}$Te:Ga
Autorzy:: Szatkowski, J.
Płaczek-Popko, E.
Sierański, K.
Bieg, B.
Tematy:: 71.55.-i
71.55.Gs; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1992339.pdf Link otwiera się w nowym oknie
Opis:: Two types of samples were studied. In the material with higher donor concentration four electron traps labelled by us as E1 to E4 were found. For the traps E2 and E3 energies obtained from Arrhenius plots are equal to 0.24 eV and 0.36 eV, respectively. Electric field enhanced electron emission from the levels E1 and E4 was observed and described in terms of Frenkel-Poole mechanism. Capture process from the traps E2 was found to be thermally activated with energetic barriers equal to 0.20 eV for E2.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Two-Electron DX State in CdTe:In
Autorzy:: Skierbiszewski, C.
Wiśniewski, P.
Litwin-Staszewska, E.
Suski, T.
Wilamowski, Z.
Zakrzewski, A. K.
Karczewski, G.
Jantsch, W.
Tematy:: 71.55.Gs
73.61.Ga; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1952096.pdf Link otwiera się w nowym oknie
Opis:: In this paper we investigate electron emission/capture from/to the DX state of indium in CdTe by means of high pressure freeze-out cycle and steady-state photo-conductivity experiments. The results indicate that the DX state is occupied by two electrons. A comparison with deep level transient spectroscopy data shows that two-electron emission occurs at low temperatures, while one-electron emission takes place at high temperatures.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Energy Level Position of Ni and Band Offsets in Zn$\text{}_{1-x}$Cd$\text{}_{x}$Sc:Ni and ZnS$\text{}_{x}$Sc$\text{}_{1-x}$:Ni
Autorzy:: Surkova, T.
Giriat, W.
Godlewski, M.
Kaczor, P.
Zakrzewski, A. J.
Permogorov, S.
Tenishev, L.
Tematy:: 78.20.Wc
71.55.Gs; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1934015.pdf Link otwiera się w nowym oknie
Opis:: Absorption and reflectivity measurements have been carried out for Zn$\text{}_{1-x}$Cd$\text{}_{x}$Se:Ni and ZnS$\text{}_{x}$Se$\text{}_{1-x}$:Ni solid solutions. Energy level positions of nickel 2+/1+ charge state have been used for estimation of band offsets for the valence and conduction bands of ZnCdSe/ZnSe and ZnSSe/ZnSe. Intra-shell transitions of Ni$\text{}^{2+}$ were also studied.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Spatial Correlations of Donor Charges in MBE CdTe
Autorzy:: Suski, T.
Wiśniewski, P.
Litwin-Staszewska, E.
Wasik, D.
Przybytek, J.
Baj, M.
Karczewski, G.
Wojtowicz, T.
Zakrzewski, A.
Kossut, J.
Tematy:: 72.80.Ey
71.55.Gs; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1934021.pdf Link otwiera się w nowym oknie
Opis:: We present experimental evidence that at high pressures indium donors in CdTe localize electrons in spatially correlated manner. We have studied Hall mobility, μ$\text{}_{H}$, as a function of electron concentration, n$\text{}_{H}$, at T=77 K. Changes of n$\text{}_{H}$ have been achieved by two methods. High pressure freeze-out of electrons onto localized states of In-donors leads to the mobility enhancement with respect to the situation when n$\text{}_{H}$ has been modified by means of a subsequent annealing of the sample. As a result, depending on the degree of spatial correlations in the impurity charges arrangement, different values of μ$\text{}_{H}$ correspond to the same value of n$\text{}_{H}$. The variation of mobility with electron concentration suggests that the localized state of In-donor represents likely negatively charged DX state.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

Tytuł:: Investigation of Strain in II-VI Semiconductor Superlattices Using Electron Paramagnetic Resonance of Mn$\text{}^{++}$
Autorzy:: Furdyna, J. K.
Qazzaz, M.
Yang, G.
Montes, L.
Xin, S. H.
Luo, H.
Tematy:: 78.66.-w
71.55.Gs; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1933687.pdf Link otwiera się w nowym oknie
Opis:: We explore the possibility of using electron paramagnetic resonance (EPR) of Mn$\text{}^{++}$ for measuring uniaxial strain in II-VI superlattices. This work is motivated by the fact that the EPR spectrum of Mn$\text{}^{++}$ is very strongly affected by crystalline fields. Changes in a crystalline field which arise from strain are thus automatically expected to have a profound effect on the EPR spectrum. Consistent with this expectation, we have observed giant crystal field splittings of Mn$\text{}^{++}$ EPR lines in ZnTe/MnTe, CdTe/MnTe, and ZnTe/MnSe superlattices. The EPR spectra observed in these systems are ascribed to isolated Mn$\text{}^{++}$ ions diffused into the ZnTe or the CdTe layers from the respective MnTe or MnSe layers. In addition to providing precise information oii the magnitude and the sign of strain produced by lattice mismatch between the superlattice constituents, we show that the EPR spectrum also provides a direct measure of strain fluctuations in the layered medium.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Hopping Conductivity in (Zn,Fe)Se Intentionally Doped with Ag
Autorzy:: Zaręba, A.
Demianiuk, M.
Tematy:: 71.55.Gs
72.80.Ey; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1921698.pdf Link otwiera się w nowym oknie
Opis:: The transport phenomena in (Zn,Fe)Se were studied. In order to obtain iron centers in Fe$\text{}^{3+}$ charge state the crystals were doped by Ag what produces acceptors compensating Fe$\text{}^{2+}$ donors. The results are explained in terms of thermally activated jumping of charges between Fe$\text{}^{3+}$ and Fe$\text{}^{2+}$ centers. The nature of activation energy is discussed. The polaron model seems to be not valid in our case. The Coulomb interaction between charged acceptors and "holes" on iron centers is considered as the origin of thermal activation of jumps. We suggest the deviation from random and mutually independent distributions of charged Ag acceptors and Fe$\text{}^{3+}$ ions resulting from the electrostatic interactions between them at high temperatures.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Growth and Characterization of Wide-Gap $Cd_{1-x}Zn_{x}Se$ Ternary Alloys by Using Electron Beam Evaporation Technique
Autorzy:: Suthagar, J.
Rajesh, S.
Perumal, K.
Balasubramaniam, T.
Suthan Kissinger, N.
Tematy:: 71.55.Gs
61.05.cp; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1538742.pdf Link otwiera się w nowym oknie
Opis:: $Cd_{1-x}Zn_{x}Se$ films with different zinc content were deposited by electron beam evaporation technique onto glass substrates for the application of solid-state photovoltaic devices. The structural, surface morphological and optical properties of $Cd_{1-x}Zn_{x}Se$ films have been studied in the present work. The host material, $Cd_{1-x}Zn_{x}Se$, has been prepared by the physical vapor deposition method of electron beam evaporation technique under the pressure of 1 × $10^{-5}$ mbar. The X-ray diffractogram indicates that these alloy films are polycrystalline in nature, of hexagonal structure with strong preferential orientation of the crystallites along (002) direction. Linear variation of lattice constant with composition (x) is observed. Surface roughness measured by atomic force microscopy is used to estimate the interface roughness. The optical properties show that the band gap $(E_{g})$ values vary from 2.08 to 2.64 eV as zinc content varies from 0.2 to 0.8. The surface morphological studies show the very small, fine and hardly distinguishable grains smeared all over the surface. The material properties would be altered and excellently controlled by adiusting the system composition x.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 8.

Tytuł:: Photoluminescence of Co-Doped ZnCdSe and ZnSSe Alloys
Autorzy:: Surkova, T. P.
Born, H.
Thurian, P.
Hoffmann, A.
Busse, W.
Gumlich, H.-E.
Broser, I.
Giriat, W.
Tematy:: 71.55.Gs
78.20.Wc; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1968428.pdf Link otwiera się w nowym oknie
Opis:: Photoluminescence measurements have been carried out for Zn$\text{}_{1-x}$ Cd$\text{}_{x}$ Se:Co and ZnS$\text{}_{x}$Se$\text{}_{1-x}$:Co mixed crystals. Changes of recombination channels are observed in mixed crystals as compared to the emission of host binary compounds. Character of changes is slightly different for the alloys with cation and anion substitution. Photoluminescence kinetics of the L-line and of two other Co$\text{}^{2+}$ intra-shell emission bands was measured to determine radiative decay rates.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: On the Nature of Eu-Related Emissions in ZnS and CaS
Autorzy:: Świątek, K.
Godlewski, M.
Niinistö, L.
Leskelä, M.
Tematy:: 71.55.Gs
71.35.+z
78.55.Et; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1879960.pdf Link otwiera się w nowym oknie
Opis:: The Eu-connected recombination processes in ZnS and CaS are analyzed on the basis of optical studies. A new Eu-related emission in ZnS is attributed to the recombination of an exciton bound at the Eu$\text{}^{2+}$ center, while in CaS the emission is dominated by the direct Eu$\text{}^{2+}$ intra-ion transition.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 10.

Tytuł:: Ionization Energies of RE Ions in wide Bandgap Sulphides
Autorzy:: Świątek, K.
Godlewskl, M.
Tematy:: 71.55.Gs
78.55.Et; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1879958.pdf Link otwiera się w nowym oknie
Opis:: An analysis of rare earth (RE) energy level positions in wide bandgap sulphides is presented. It is shown that the Jörgensen's refined spin-pairing energy theory (RESPET) predicts correctly the photo-ionization (PI) energy of Sm in ZnS.
Dostawca treści:: Biblioteka Nauki

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