By B. G. Bagley (auth.), J. Tauc (eds.)

ISBN-10: 1461587050

ISBN-13: 9781461587057

ISBN-10: 1461587077

ISBN-13: 9781461587071

Solid kingdom physics after fixing so effectively many basic difficulties in excellent or somewhat imperfect crystals, attempted lately to assault difficulties linked to huge disease with the purpose to appreciate the results of the inability of the long-range order. Semiconductors are even more replaced through disease than metals or insulators, and seem to be the main appropriate fabrics for basic paintings. enormous exploratory paintings on amorphous and liquid semiconductors used to be performed by way of the Leningrad college because the early fifties. in recent times, a lot learn in numerous nations used to be directed to deepen the knowledge of the structural, digital, optical, vibrational, magnetic and different right­ ties of those fabrics and to in all likelihood procedure the current point of less than­ status of crystalline semiconductors. This attempt was once prompted not just via merely clinical curiosity but additionally via the opportunity of new purposes from which reminiscence units within the normal feel are probably the main demanding. The learn met with severe problems that are absent in crystals.

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If, as would be expected, the photo enhancement served to lower the kinetic barrier, then the nucleation frequency would both increase and shift to a larger undercooling. In the (unlikely) limit of ~Ga going to zero, then the maximum nucleation frequency occurs at Tm (OK)/3. Ovshinsky and Klose (1971) observed a photo-enhancement of the nucleation frequency in a thin film of unstated (proprietary) composition. They observe a photo plus thermal surface nucleation frequency of 5 X 106 cm- 2 whereas the thermal nucleation alone was 104 cm- 2 .

These authors observe that the crystallization of an As 11 Te7 Ge2 alloy with the application of an electric field always nucleated at the positive voltage electrode and grew towards the negative. If the voltage was reversed before a complete crystalline filament was formed, then the already formed filament was observed to recede and a new filament observed to nucleate at the now positive electrode. Feinleib et at. (1971) have suggested that the electric field enhances crystallization kinetics by producing excess electron-hole carriers; there being a direct analogy to the photo-enhanced crystallization discussed above.

Bur. of Standards, 65A, 297. Hruby, A. , (1971a), Mat. Resh. , 6,247. Hruby, A. , (1971b),Mat. Resh. , 6,465. loffe, A. F. and Regel, A. , (1960), Frogr. in Semiconductors, 4,237. Jackson, K. A. , (1956) Can. J. , 34,473. James, P. F. and McMillan, P. , (1968), Phil. , 18,863. Johnson, R. T. , and Quinn, R. , (1971), Solid State Comm, 9,393. Jones, G. , (1956), Glass, Methuen, London. , (1948), Chern. , 43,219. Keneman, S. , (1971), Appl. Phys. , 19, 205. , (1969), The Scattering of Light and Other Electromagnetic Radiation, Academic Press, New York.

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Amorphous and Liquid Semiconductors by B. G. Bagley (auth.), J. Tauc (eds.)

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