Localized conduction processes in amorphous germanium

Morgan, M.; Walley, P.A.

doi:10.1080/14786437108216412

Cited by 114 publications

(30 citation statements)

References 12 publications

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“…This predation rate is proportional to x for small x, but saturates to a constant k for large x, this being a destabilizing element of the overall system. Other qualitatively similar forms have been developed by Gause (10) (kx%y), Rosenzweig (5) (kxvy, with 1 > -y > 0), Holling (11) [kxy/(l + cx)], and others (12,13). Similarly the second term on the right in Eq.…”

Section: Limit Cycles In Predator-prey Communitiessupporting

confidence: 61%

“…Similarly the second term on the right in Eq. 2b describes the relation between prey abundance and predator birth rate (Holling's numerical response), and may have either the explicit form given here or other equivalent forms (12,13). The form of many of these interaction terms [particularly those in the work of Watt (8,12) and Holling (1, 11)] is motivated by the observed properties of real predator-prey communities.…”

Section: Limit Cycles In Predator-prey Communitiesmentioning

confidence: 99%

“…This may occur by parallel mechanisms, increased mobility: in melanins by the promotion of electrons from localized states to extended states, and in crystals by the promotion of electrons across the gap in the density of states. The rise in conductivity when a voltage is applied, which was also considered anomalous (4), may be explained in terms of (i) an increase in the kinetic energy of the electrons with respect to the potentials within which they are trapped, leading to higher mobility and promotion to excited states (8), or (ii) field-assisted emission from acceptors, which produces exponential behavior in the currentvoltage characteristics (13).…”

mentioning

confidence: 99%

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Human Lactational and Ovarian Response to Endogenous Prolactin Release

Tyson

Friesen

Anderson

1972

Science

148

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Radioimmunoassayable prolactin rises in postpartum women during nursing and after intravenous thyrotropin-releasing hormone (TRH). Prolactin release induced by TRH can be dissociated from the postsuckling response. In addition to this, increases in endogenous prolactin secretion are followed by marked breast engorgement and milk letdown, especially after intravenous TRH. In this group of breast-feeding women, vaginal smears remained atrophic even up to 410 postpartum days. Prolactin appears to influence the production of breast milk, and the maintenance of a regular nursing pattern seems to promote the maintenance of ovarian unresponsiveness to circulating gonadotropins.

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Section: Limit Cycles In Predator-prey Communitiessupporting

confidence: 61%

Section: Limit Cycles In Predator-prey Communitiesmentioning

confidence: 99%

mentioning

confidence: 99%

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Human Lactational and Ovarian Response to Endogenous Prolactin Release

Tyson

Friesen

Anderson

1972

Science

148

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“…It may be mentioned here that in amorphous materials, non-ohmic behavior has also been explained in terms of high field conduction due to the Poole-Frenkel effect of screened charge intrinsic defects and field induced lowering of energy barriers for the charge-carrier hopping within localized states at the band edges [23][24][25], according to which the current I at a particular voltage V is given by:…”

Section: Resultsmentioning

confidence: 99%

Space charge limited conduction in a-(Ge20Se80)1−xSnx thin films

Singh

Tripathi

Kumar

2006

Journal of Non-Crystalline Solids

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“…For all the samples studied here y = 0.5, which indicates that bimolecular recombination is prevalent in the present materials. 3.00xl0 3 3.10xl0 3 3.20xl0 3 3.30xl0-3 3.00xl0-3 3.10xl0 3 3.20xl0 3 3.30xl0 3 3. Such a type of behaviour has been observed in a range of amorphous materials such as SiO [13], Ge [14], C [15] and has been interpreted in terms of Poole-Frenkel conduction according to which, current, at a particular voltage, follows the following relation:…”

Section: -Experimentalmentioning

confidence: 99%

Photoconductivity and high-field conduction studies in amorphous this films of Se80-x Te20 Sbx

et al. 1998

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The present paper reports the temperature dependence of dark-and photo-conductivities in vacuum-evaporated thin films of a-Seso _ xTezoSbx with a view to see the effect of Sb addition to the binary SesoTezo system. The results indicate that the photoconductivity (0 ph) increases along with the dark conductivity (0 d) after the addition of Sb to the binary SesoTezo system. The relative photosensitivity, however, decreases upon Sb addition. The results are explained in terms of the charged defect states. Current-voltage characteristics have also been studied and the results indicate that the dark current becomes super Ohmic at higher fields 10 4 Vjcm. An analysis of the experimental data indicates that a Poole-Frenkeltype conduction may be responsible for the observed behaviour.PACS 72.80 -Conductivity of specific materials. -IntroductionThe effect of impurities in chalcogenide glasses has been an important issue because of its basic and applied aspects in the fabrication of n-and p-type glassy semiconductors. Mott [1] suggested that the impurity atom satisfies its valence requirements by adjusting its nearest-neighbour environment, thus exerting little effect on the electrical properties. However, experiments showed that the impurity effect does exist [2-4] in chalcogenide glasses. Not all of the impurity atoms act in an electrically active manner and hence a large concentration of impurity is required to produce an appreciable effect on the electrical properties. Moreover, it is found experimentally that impurity effects depend strongly on the composition of the glass, the chemical nature of the impurity, the method of impurity incorporation and impurity concentration. A great deal of experimental data are required to understand the impurity effects in chalcogenide glasses.In view of the above, we have started a study of the impurity effect on electrical properties in binary Se-Te systems. The results indicate that metallic additives change the electrical properties drastically in the above glassy system [5][6][7][8].The present paper reports the effect of Sb incorporation on the dark-and photo-conductivities in 3-SesoTezo. High-field conduction studies have also been made

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Localized conduction processes in amorphous germanium

Cited by 114 publications

References 12 publications

Human Lactational and Ovarian Response to Endogenous Prolactin Release

Human Lactational and Ovarian Response to Endogenous Prolactin Release

Space charge limited conduction in a-(Ge20Se80)1−xSnx thin films

Photoconductivity and high-field conduction studies in amorphous this films of Se80-x Te20 Sbx

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