Disrupt a plot Definizione: A plot is a secret plan by a group of people to do something that is illegal or wrong. Significato, pronuncia, traduzioni ed esempi. This Rough Magic is a romantic suspense novel by Mary Stewart, first published in 1964.The title is a quote from William Shakespeare's The Tempest.Like several other novels by Stewart, it is set in Greece and has an element of suspense.

A Tauc plot^[1] is used to determine the optical bandgap, or Tauc bandgap, of either disordered^[2] or amorphous^[3] semiconductors.

In his original work Jan Tauc (/taʊts/) showed that the optical absorption spectrum of amorphous germanium resembles the spectrum of the indirect transitions in crystalline germanium (plus a tail due to localized states at lower energies), and proposed an extrapolation to find the optical bandgap of these crystalline-like states.^[4] Typically, a Tauc plot shows the quantity hν (the photon energy) on the abscissa and the quantity (αhν)^1/2 on the ordinate, where α is the absorption coefficient of the material. Thus, extrapolating this linear region to the abscissa yields the energy of the optical bandgap of the amorphous material.

A similar procedure is adopted to determine the optical bandgap of crystalline semiconductors.^[5] In this case, however, the ordinate is given by (α)^1/r, in which the exponent ^1/r denotes the nature of the transition:^[6],[7],[8]

Plot Traduzione Inglese Italiano

• r = 1/2 for direct allowed transitions
• r = 3/2 for direct forbidden transitions.
• r = 2 for indirect allowed transitions
• r = 3 for indirect forbidden transitions

Again, the resulting plot (quite often, incorrectly identified as a Tauc plot) has a distinct linear region that, extrapolated to the abscissa, yields the energy of the optical bandgap of the material.^[9]

References[edit]

Plots Traduzione Spagnolo

1. ^Tauc, J. (1968). 'Optical properties and electronic structure of amorphous Ge and Si'. Materials Research Bulletin. 3: 37–46. doi:10.1016/0025-5408(68)90023-8.
2. ^Mott, N. F. & Davis, E. A. (1979). Electronic processes in non-crystalline materials. Clarendon Press, Oxford. ISBN0-19-851288-0.CS1 maint: multiple names: authors list (link)
3. ^Street, R. A. (1991). Hydrogenated amorphous silicon. Cambridge Univ. Press, Cambridge. ISBN0-521-37156-2.
4. ^Tauc, J.; Grigorovici, R.; Vancu, A. (1966). 'Optical Properties and Electronic Structure of Amorphous Germanium'. Physica Status Solidi B. 15 (2): 627. Bibcode:1966PSSBR..15..627T. doi:10.1002/pssb.19660150224.
5. ^Yu, P. Y. & Cardona, M. (1996). Fundamentals of semiconductors. Springer, Berlin. ISBN3-540-61461-3.CS1 maint: multiple names: authors list (link)
6. ^MacFarlane, G. G. & Roberts, V. (1955). 'Infrared absorption of germanium near the lattice edge'. Physical Review. 97 (6): 1714–1716. doi:10.1103/PhysRev.97.1714.2.CS1 maint: multiple names: authors list (link)
7. ^MacFarlane, G. G., McLean, T. P., Quarrington, J. E. & Roberts, V. (1958). 'Fine structure in the absorption-edge spectrum of Si'. Physical Review. 111 (5): 1245–1254. doi:10.1103/PhysRev.111.1245.CS1 maint: multiple names: authors list (link)
8. ^Davis, E. A.; Mott, N. F. (1970). 'Conduction in non-crystalline systems V. Conductivity, optical absorption and photoconductivity in amorphous semiconductors'. Philosophical Magazine A. 22 (179): 903–922. doi:10.1080/14786437008221061.
9. ^Zanatta, A. R. (2019). 'Revisiting the optical bandgap of semiconductors and the proposal of a unified methodology to its determination'. Scientific Reports. 9: 11225–12pp. doi:10.1038/s41598-019-47670-y.

Plots Traduzione Inglese