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Please use this identifier to cite or link to this item: http://purl.org/purl/3335

Title: Photoacoustic investigation of the optical and thermal properties of selected amorphous chalcogenide semiconductors
Authors: Madhusoodanan, K N
Dr. Jacob, Philip
Keywords: Amorphous semiconductor
Energy band models
Photoacoustic spectroscopy
Thermal properties
Photoacoustic spectrometer
Issue Date: Nov-1988
Publisher: Cochin University of Science And Technology
Abstract: This thesis work has mainly concentrated on the investigation of the ,optical and thermal properties of binary semiconducting chalcogenide glasses belonging to the AivB¥5x and AZBXEX families. The technique used for these studies is a relatively new one namely, the photoacoustic (PA) technique. This technique is based on the detection of acoustic signal produced in an enclosed volume when the sample is irradiated by an intensity modulated radiation. The signal produced depends upon the optical properties of the sample, and the thermal properties of the sample, backing material and the surrounding gas. For the present studies an efficient signal beam gas-microphone PA spectrometer, consisting of a high power Xenon lamp, monochromator, light beam chopper, PA cell with microphone and lock-in amplifier, has been set up. Two PA cells have been fabricated: one for room temperature measurements and another for measurements at high temperatures. With the high temperature PA cell measurements can be taken upto 250°C. Provisions are incorporated. in both the cells to change the volume and to use different backing materials for the sample. The cells have been calibrated by measuring the frequency response of the cells using carbon black as the sample
Description: Department of physics, Cochin University of Science And Technology
URI: http://dyuthi.cusat.ac.in/purl/3335
Appears in Collections:Faculty of Sciences

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