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Bandgap Determination of Cubic Rocksalt AlN Film from Experimental and Theoretical Investigations
Abstract:
Cubic rocksalt (RS) AlN film was grown on MgO (100) substrate by laser molecular beam epitaxy (LMBE) technique, and its bandgap was determined experimentally and theoretically. Based on the analysis of optical transmittance spectrum, the RS AlN film shows an indirect bandgap of 4.807 eV. Using the Cambridge sequential total energy package (CASTEP) module of materials studio (MS) software, an indirect bandgap of RS AlN is predicted as observed experimentally. While the calculated bandgap is smaller than the experimental value, which can be ascribed to the inaccurately handled exchange-correlation energy in the calculations.
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52-55
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September 2014
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