By Topic

A photoacoustic spectrometer for measuring subgap absorption spectra of semiconductors

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

The purchase and pricing options are temporarily unavailable. Please try again later.
3 Author(s)
Zegadi, A. ; Department of Electronic and Electrical Engineering, University of Salford, Salford M5 4WT, United Kingdom ; Slifkin, M.A. ; Tomlinson, R.D.

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.1144733 

In this paper we describe the design of a high resolution near‐infrared photoacoustic spectrometer of the gas‐microphone type intended to be used for measuring impurity absorption spectra of semiconductors. Particular attention has been paid to the design of the photoacoustic cell to find the most suitable one, and as a result, several cells differing in geometry and materials have been investigated. We present results for the PA amplitude dependence on the modulating frequency for carbon black powder and some widely used semiconductors. The sensitivity of the spectrometer and its effectiveness in resolving active defect states existing in the subgap absorption spectra of semiconductors are demonstrated in both optically opaque and transparent thick and thin samples.

Published in:

Review of Scientific Instruments  (Volume:65 ,  Issue: 7 )