Semiconductors

Non-steady-state photo-EMF in a periodically poled MgO : LiNbO$_3$ crystal

M. A. Bryushinin^a, V. V. Kulikov^a, I. A. Sokolov^a, E. N. Savchenkov^b, N. I. Burimov^b, S. M. Shandarov^b, A. R. Akhmatkhanov^c, M. A. Chuvakova^c, V. Ya. Shur<sup>c

a</sup> Ioffe Institute, St. Petersburg, Russia
^b Tomsk State University of Control Systems and Radioelectronics, Tomsk, Russia
^c Ural Federal University named after the First President of Russia B. N. Yeltsin, Yekaterinburg, Russia

Abstract: The diffusion mode of the non-steady-state photo-EMF excitation is investigated in periodically poled MgO : LiNbO$_3$ crystal at light wavelength $\lambda$ = 457 nm. The signal excitation is carried out along the polar axis of the crystal; the dependencies of the signal amplitude versus the phase modulation frequency, intensity and spatial frequency of the interference pattern are studied in this geometry. The analysis of these dependencies allows determining the photoelectric parameters of the material – the type, value and relaxation time of the photoconductivity, as well as the diffusion length of charge carriers.

Keywords: non-steady-state photo-EMF, periodic domain struc ture, lithium niobate.

Received: 03.11.2022
Revised: 03.11.2022
Accepted: 25.11.2022

DOI: 10.21883/FTT.2023.02.54291.519

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