Optical Absorption of Impurities and Defects in by Bernard Pajot, Bernard Clerjaud

By Bernard Pajot, Bernard Clerjaud

This booklet outlines, with the aid of a number of particular examples, the real function performed through absorption spectroscopy within the research of deep-level facilities brought in semiconductors and insulators like diamond, silicon, germanium and gallium arsenide by means of high-energy irradiation, residual impurities, and defects produced in the course of crystal progress. It additionally describes the the most important position performed through vibrational spectroscopy to figure out the atomic constitution and symmetry of complexes linked to gentle impurities like hydrogen, carbon, nitrogen and oxygen, and as a device for quantitative research of those components within the materials.

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Additional resources for Optical Absorption of Impurities and Defects in Semiconducting Crystals: Electronic Absorption of Deep Centres and Vibrational Spectra

Example text

In these methods, a monocrystalline seed is mounted at the bottom or at the top of a polycrystalline charge and the polycrystalline region in contact with the seed is melted by a contactless technique (RF field or halogen lamp furnace). The melted region is prevented to flow from capillarity forces alone and it is displaced upward or downward by moving the RF coil, leaving a monocrystalline region. This method, known as float-zone (FZ) growth method, was invented independently by several scientists ([17], and references therein).

A second atomic geometry has also been investigated by Jones et al. [41] for the nitrogen split di-interstitial, based on a model proposed as a building block of the platelets in diamonds assuming that they were made of nitrogen, called the Humble model [42]. This latter configuration, with C2v symmetry and consisting of two [011] nnn split interstitials, is shown in Fig. 8. 9 eV larger than the one of Fig. 7, but it is found to be the most stable configuration for the diamagnetic self-di-interstitial in diamond [43].

4 Physico-chemical Properties 19 point, the solubility Nsol-s decreases with respect to the liquid phase and the ratio Nsol-s =Nsol-l is the segregation (or distribution) coefficient, which is usually less than unity. g. SiC in C-doped silicon) or of an alloy. The solubility of an impurity is conditioned by characteristics such as its atomic radius, electronic structure, site(s) in the crystal, eventual binding energies with the atoms of the crystal, and tendencies to complex or to form pairs. As it generally requires energy to introduce an impurity in a crystal, solubility is a temperature-dependent (thermally activated) process characterized by an activation energy (the heat of solid solution), and for this reason, it is larger near the melting point of the crystal than at RT.

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