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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1767-1774 
    ISSN: 0392-6737
    Keywords: Impurity and defect absorption in solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto I centri microscopici di diffusione in cristalli accresciuti di AgGaS2 sono stati studiati col microscopio ottico e col microscopio elettronico a scansione. I difetti consistono in placchette rettangolari che giacciono nei piani (100) e (010). La loro dimensione maggiore (fino a 100 μm) era parallela alla direzione [001]. La loro dimensione minore è parallela alle direzioni [100] e [010], rispettivamente. I centri di diffusione erano usualmente spessi alcune frazioni di micrometro e non sembravano avere una composizione diversa dalla fase della matrice, secondo risultati dell'analisi a disperisione di energia. I difetti possono essere eliminati per ricottura in Ag2S o spegnimento da temperature elevate, il che suggerisce che i difetti possono essi stessi consistere in una regione a due fasi, parte della quale dovrebbe essere ricca di Ga2S3, dove particelle della seconda fase a barretta o a placchetta sono inglobate nella matrice. La quantità e le dimensioni di questa seconda fase rendono difficile un'analisi definitiva della composizione.
    Abstract: Резюме Используя оптическую и электронную сканируюшую микросконию, исследуются микроскопические центры рассеяния в AgGaS2. Дефекты состоят из прямоугольных пластинок, расположенных в плоскостях (100) и (010). Их наибольший размер (до 100 мкм) параллелен направлению [001]. Их наименьший размер соответственно располозен параллельно направлениям [100] и [010]. Центры рассеяния обычно представляют осколки микронной толщины и согласно анализу диссипации энергии, по-видимому, имеют состав, не отличающийся от матричной фазы. Дефекты могут быть удалены поредством отжита Ag2S или посредством закалки. Предполагается, что сами дефекты могут состоять из двухфазных областей, часть из которых должна быть обогащена Ga2S3, где стержне-подобные и пластино-подобные частицы второй фазы внедрены в матрипу. Количество и размер второй фазы затрудняет окончательный анализ состава.
    Notes: Summary Microscopic scattering centers in as-grown AgGaS2 were investigated by optical and scanning electron microscopy. The defects consisted of rectangular platelets lying in the (100) and (010) planes. Their longest dimension (up to 100 μm) was parallel to the [001]-direction. Their shorter dimension was parallel to the [100] and [010] directions, respectively. The scattering centers were usually fractions of a micrometer thick and did not appear to have a different composition than the matrix phase according to results by energy-dispersive analysis. The defects can be eliminated by annealing in Ag2S or quenching from elevated temperature, which suggests that the defects may themselves consist of a two-phase region, part of which should be Ga2S3-rich, where rodlike or platelike second-phase particles are embedded in the matrix. The quantity and the size of this second phase make a definitive compositional analysis difficult.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1489-1491 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Synchronous noncollinear upconversion detection is reported for the first time with a Nd:YAG laser in AgGaS2. Q-switched pump laser pulses with a repetition rate up to 50 Hz were synchronized with intracavity chopped continuous wave CO2 laser pulses. Results were obtained both by tuning the CO2 laser and by varying the angle between the laser beams.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 5282-5284 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The prospect of temperature tunability in an AgGaSe2 crystal for use in infrared nonlinear optics is explored for the first time. Tunable second harmonic generation from CO2 laser radiation is studied at different temperatures of the crystal. The tuning offered is small and the experimental finding is consistent with dispersion measurement.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2583-2590 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and low-energy electron diffraction (LEED) have been used to study the polar (111)Cd and (111)Te surfaces of intrinsic CdTe crystals. Complementary information on surface composition, chemical state of the surface elements, and surface structure was obtained. The Auger parameters were used to identify the chemical states of elements on surfaces of semi-insulating undoped CdTe crystals which suffered from static charging effects. With this approach, we were able to determine that after chem-mechanical polishing, the Te-rich surface layer was mostly in the pure Te state. Only a trace amount of TeO2 was detectable. Sputtered and vacuum annealed (111) surfaces were found to be stoichiometric: both Cd and Te were in the chemical state of CdTe. Both (111) Cd and (111) Te surfaces showed sixfold symmetric LEED patterns. No evidence of surface reconstruction was found. Angle-resolved XPS showed no significant difference between 0° and 70° tilt on either the (111) Cd or (111) Te surfaces. Angle-resolved AES, however, showed significant differences between (111) Cd and (111) Te at 0° and 70° tilt, and the crystallographic polarity identified this way was consistent with results based on chemical etching and standard AES techniques, and with reported results of x-ray diffraction and transmission electron microscopy.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0649
    Keywords: 42.65K ; 7.62 ; 86.70f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Tangential near-noncritical phase matching is reported for upconversion in silver thiogallate (AgGaS2) using a dye laser as pump. A large acceptance angle for noncollinearity as desirable from a device view point is realised. Weak temperature tunability is also exploited to realise noncriticality.
    Type of Medium: Electronic Resource
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