Vibrational modes, semiconductor impurities

Table II. Localized Vibrational Modes of Isolated Impurities in Semiconductors...

In the past five decades, a number of donors, acceptors, and their complexes with excitons in semiconductors have been discovered and delineated. Isoelectronic impurities and their localized vibrational modes have also been extensively studied in infrared absorption and Raman and luminescence spectroscopies. 

In the fabrication of semiconductors, the composition of ternary and quaternary alloys can be strongly influenced by factors like the temperature and the duration of the annealing processes. For example, the sulfur content in CdSSe quantum dots increases with increasing temper temperature [48]. In the case of superlattices with very thin layer thicknesses, unwanted ternary or quaternary alloys can be formed by diffusion of the ions into the adjacent layer. Because of this, it is necessary to prove the material composition of the alloys after the growth. The behavior of the vibrational properties of a system with an incorporated element B in the crystal lattice AC is similar to the problem of the impurities The element B causes a distortion of the lattice because of the difference in the masses and, hence, of the appearance of new modes. With increasing... 

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