Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
63 (1988), S. 1714-1721
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A novel technique termed superconducting photorelaxation spectroscopy is described in detail which utilizes a superconducting tunnel junction for detection of phonons from optically illuminated semiconductors. The method makes use of a lock-in, highly sensitive, detection technique which allows for direct detection of phonons. The system noise is suppressed to the level of 100 pV, enabling one to detect the phonon signal with an S/N ratio of 104. It is demonstrated that the phonon signal detected does not depend upon the chopper frequency, in contrast to conventional photoacoustic spectroscopy. The phonon signal as a function of wavelength of light employing a silver optical reflector yields a clear band-gap structure and modulated structures in the deep-level region consistent with the measurements obtained by other techniques for GaAs and InP wafers. The model for the phonon-detection system with its associated sensitivity is presented. It appears this method will be a very promising technique to study the nonradiative states of semiconductor crystals.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.339907
Permalink
Library |
Location |
Call Number |
Volume/Issue/Year |
Availability |