Energy Gap of CdS by Photoacoustic Spectroscopy

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Wicharn Techitdheera*
Wisanu Pecharapa


Photoacoustic Spectroscopy (PAS) has been set up at Physics Department, KMITL, in order to characterize some interesting materials. The system consists of  high intensity broad spectrum light source (Xenon lamp 450 W), PA cell from MTEC model 300, UV-VIS  monochromator and lock-in amplifier with chopper. The wavelength selection is usually controlled by HJY Spectrometer Control Program. Cadmium Sulfide (CdS) powder was used as the sample to determine its energy gap. The energy gap of CdS from our experiment is 2.43 eV with respect to 2.42 eV from the accepted value.

Keywords:  photoacoustic spectroscopy (PAS), Eg of CdS

Corresponding author: Tel: 080-6061188  Fax: 02-3264413



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