Download Photoresponse of the GaAs/AlGaAs core

Main field of study: 010900 Applied Mathematics and Physics
Area of specialization: Optics of Semiconductor Nanostructures and Nanotechnologies
Department of Physics of Solid State
Scientific advisor: lecturer N.R. Grigorieva
Reviewer: scientific researcher I.V. Shtrom
Photoresponse of the GaAs/AlGaAs core-shell quantum wire array.
Stationary and time-depended processes.
I. I. Gerasimov
In this work we research a photoresponse of the n-type GaAs/AlGaAs core-shell quantum
wire array, grown by the vapor-liquid-crystal mechanism on p-type silicon substrate.
Photovoltaic and photoconductivity spectra and temporal characteristics of the photocurrent
were obtained. All studies were conducted at room temperature and at 77 K. Current-voltage
characteristics are similar to a conventional diode CVC. Reverse and forward direction are
different in the amount of current. In the reverse direction the CVC doesn't feel satiety. The
study of photovoltaic spectra shows that the photovoltaic effect can be observed in a wide
spectral range. The photosensitivity spectrum can be divided into three areas according to the
band diagram. Spectral ranges of photoconductivity and photovoltaic spectra are virtually
identical. Obtained spectral features can be described as absorption on interface defects.
The list of the publications
1. I.I. Gerasimov, N.R. Grigorieva. Photoresponse of the GaAs/AlGaAs core-shell quantum
wire array// Book of Abstracts, 15th Russian Youth Conference on Physics of
Semiconductors and Nanostructures, Opto- and Nanoelectronics. St. Petersburg, 2013.