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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 979-988 
    ISSN: 0392-6737
    Schlagwort(e): Optical properties and materials
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Beschreibung / Inhaltsverzeichnis: Riassunto In questo lavoro si riportano e discutono misure di riflettanza ed elettroriflettanza, nell'intervallo (2.5÷5.5) eV, eseguite sui campioni di silicio pesantemente drogato con arsenico. I campioni di silicio, impiantati con arsenico fino a una dose di 1017cm−2, sono stati sottoposti a laser annealing e sono state raggiunte concentrazioni di portatori liberi dell'ordine di 1021cm−3. Il riordinamento del sistema è studiato in dettaglio in corrispondenza a diverse condizioni iniziali e un confronto fra riflettanza ed elettroriflettanza appare molto utile per determinare il comportamento di un semiconduttore pesantemente drogato.
    Kurzfassung: Резюме Приводятся и обсуждаются результаты измерений отражения и электроотражения в области от 2.5 до 5.5 эВ на образцах кремния, сильно легированных мишьяком. Кристаллы кремния, имплантированные мышьяком с флуенсом 1017cm−2, облучаются лазером и концентрация свободных носителей достигает порядка 1021cm−3. При различных началыных условиях подробно исследуется переупорядочение системы. Сравнение отражения и электроотражения оказывается поленым для определения поведения сильно легированных полупроводников.
    Notizen: Summary Reflectance and electroreflectance measurements from 2.5 to 5.5 eV, performed on arsenic heavily doped silicon samples, are reported and discussed. Silicon crystals implanted with arsenic up to a fluence of 1017 cm−2 were laser irradiated and a free-carrier concentration of the order of 1021cm−3 was reached. The reordering of the system is studied in detail at different initial conditions. A comparison between reflectance and electro-reflectance appears to be quite useful to determine the behaviour of the heavily doped semiconductor.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 1487-1496 
    ISSN: 0392-6737
    Schlagwort(e): Optical properties and materials
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Beschreibung / Inhaltsverzeichnis: Riassunto In questo lavoro si presentano recenti misure FTIR relative allo stretching del legame Si−O ed al bending dei legami Si−O−Si O−Si−O in film amorfi di biossido di silicio. Si paragonano i risultati ottenuti per film cresciuti secondo differenti tecniche: APCVD, LPCVD, PACVD ed, infine, ossidazione termica. Si studia inoltre l’effetto dell’annealing termico sullo spettro ottico di assorbanza.
    Notizen: Summary In this work we report new FTIR absorbance measurements due to Si−O stretching bond, Si−O−Si and O−Si−O bending bonds of silicon dioxide amorphous films. We compare the optical results obtained from films grown by APCVD, LPCVD, PACVD and thermal oxidation techniques. The effect of thermal annealing on optical obsorbance structures has been studied.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1432-0630
    Schlagwort(e): 81.40.Tv ; 81.40.Rs ; 78.65.Ez
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract WSi2 polycrystalline films of different thicknesses were prepared by low pressure chemical vapor deposition on silicon wafers, and their crystallization properties were studied as a function of the annealing temperature. Structural measurements were performed by X-ray diffraction, detailing for the first time the phase transition from the amorphous to the hexagonal structure at an annealing temperature 380° C and from hexagonal to tetragonal above 700° C. The electrical sheet resistance showed the same transition temperatures. Optical characterization was performed by spectroscopic ellipsometry, and the real and imaginary part of the complex refractive index were obtained as a function of the annealing temperature in the 0.25–0.9 μm wavelength range. A broad optical band was found for samples annealed up to 700° C, while for higher annealing temperatures a transparency region for wavelengths greater than 0.5 μm and some significant structures appear. A corresponding behavior was observed in the infrared reflectance spectra. Furthermore, it was shown that the determination of the thickness of SiO2 grown on WSi2 requires a multilayer model, taking into account the transparency of tetragonal WSi2.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Il nuovo cimento della Società Italiana di Fisica 4 (1984), S. 141-152 
    ISSN: 0392-6737
    Schlagwort(e): Optical properties and materials
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Beschreibung / Inhaltsverzeichnis: Riassunto Sono state studiate, mediante la tecnica della termoriflettanza, le principali strutture dello spettro interbanda dei cristalli Ti1−x Hf x Se2 (0≤x≤0.3 ex=1), fra 1 e 9 eV. Si sono così ottenute nuove indicazioni circa la corrispondenza fra gli spettri interbanda del TiSe2 e dell'HfSe2. Si riportano in dettaglio e discutono i dati di termoriflettanza a valori intermedi dix con evidenza di possibili effetti di «bowing». Non sono stati osservati apprezzabili effetti della transizione di fase a 200 K ad energie superiori a 2 eV.
    Kurzfassung: Резюме Исследуются главные особенности междузонных спектров кристаллов Ti1−xHf x Se2 (0≤x≤0.3 иx=1) с помощью техники термоотражения в области от 1 до 9 эВ. Приводятся новые данные о соответствии между междузонными спектрами TiSe2 и HfSe2. Подробно обсуждаются данные при промежуточных значенияхx. Не наблюдаются заметные эффекты фазового перехода при 200 К в TiSe2 при энергиях выше 2 эВ.
    Notizen: Summary The main structures of interband spectra of Ti1−x Hf x Se2 crystals (0≤x≤0.3 andx=1) have been investigated by means of thermoreflectance from 1 to 9 eV. New indications about the correspondence of the interband spectra of TiSe2 and HfSe2 are given. Detailed data at intermediate stoichiometries, which give also evidence of possible bowing effects, are reported and discussed. No relevant effect of the 200 K phase transition in TiSe2 is observable above 2 eV.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Il nuovo cimento della Società Italiana di Fisica 5 (1985), S. 292-303 
    ISSN: 0392-6737
    Schlagwort(e): Optical properties and materials
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Beschreibung / Inhaltsverzeichnis: Riassunto In questo lavoro sono riportati e discussi gli spettri di riflettanza (R) e termoriflettanza (TR) in infrarosso di campioni di silicio drogati pesantemente per diffusione con P e B. Dai dati sono ricavati i valori dei tempi di rilassamento e della massa effettiva, come pure la derivata in temperatura della frequenza di plasma, del tempo di rilassamento e della costante dielettrica ad alta frequenza, che sono analizzati sulla base delle interazioni fra portatori liberi e fononi e fra portatori liberi e impurezze.
    Notizen: Summary In this work reflectance (R) and thermoreflectance (TR) spectra in the infra-red of bulk P and B heavily doped silicon samples are reported and discussed. The values of the scattering time and of the effective mass, as well as the temperature derivative of the plasma frequency, scattering time and high-frequency dielectric constant are extracted from the data and analysed in terms of free-carrier-photon and free-carrier-impurity interaction.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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