Boron electronic properties

Next, let us look at modification of CNTs. There are many approaches to modifying the electronic structure of CNTs oxidation [39], doping (intercalation) [69], filling [70] and substitution by hetero elements like boron and nitrogen atoms [71,72]. There have been few studies on the application of these CNTs but it will be interesting to study applications as well as electronic properties. 

A photovoltaic cell (often called a solar cell) consists of layers of semiconductor materials with different electronic properties. In most of today s solar cells the semiconductor is silicon, an abundant element in the earth s crust. By doping (i.e., chemically introducing impurity elements) most of the silicon with boron to give it a positive or p-type electrical character, and doping a thin layer on the front of the cell with phosphorus to give it a negative or n-type character, a transition region between the two types... 

The presence of two heteroatoms with different electronic properties in one molecule (one atom possessing a lone electron pair and another one with a vacant orbital, donor and acceptor, base and acid) separated by some fragment results in an interaction between the heteroatoms. Three types of the phosphorus-boron interactions have been revealed through-bond, intramolecular trans-annular (dative P—B bond), and intermolecu-lar (dative P—B bond) (Fig. 3). 

Ronning C., Banks A. D., McCarson B. L. et al.. Structure and electronic properties of boron nitride thin films containing silicon, J. Appl. Phys., 84 (1998) pp. 5046-5051. 

Additional work on dielectrics includes deposition of silica, PABS (lead aluminum boron silicates), PLZT (lead lanthanum zirconium titanate) and BST (barium strontium titanate) on Si-Ti-Pt wafers (Figure 2). The wafer specimens were patterned with metal electrodes and electronic properties were characterized. 

Covering many areas of chemistry with boron at its centre, topics include applications to polyolefin catalysis, medicine, materials and polymers boron cluster chemistry, including carboranes and metal-containing clusters organic and inorganic chemistry of species containing only 1 or 2 boron atoms and theoretical studies of boron-containing compounds. New materials with novel optical and electronic properties are also discussed. 

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