STUDY OF BAND GAP ENERGY AND THERMAL PROPERTIES OF PbI2 BY PHOTOACOUSTIC SPECTROSCOPY

Abstract

The present work determined the band gap energy of PbI 2 equal to 2.31 eV by amplitude measurement of the photoacoustic (PA) signal using the front side detection configuration. Furthermore, the thermal properties were obtained from the phase recording of the PA signal at the characteristic frequency 55 Hz of the single crystal (250 μm). These properties have also been compared with the earlier reported values under identical experimental conditions by amplitude recording of the PA signal on the same PA spectrometer.