Gap energy studied by optical transmittance in lead iodide monocrystals grown by Bridgman's Method

Abstract

The bandgap energy as a function of temperature has been determined for lead iodide. The monocrystal was obtained in a vacuum sealed quartz ampoule inside a vertical furnace by Bridgman's method. The optical transmittance measurement enables to evaluate the values of Eg. By a fitting procedure of Eg as a function of temperature is possible to extract the parameters that govern its behavior. The variation of Eg with temperature was determined as:-4 eV/K and α = (192 ± 90) K. The bandgap energy of lead iodide at room temperature was found to be 2.277 ± 0.007 eV.

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