Working Paper Article Version 1 This version is not peer-reviewed

Photoconductivity in Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals

Version 1 : Received: 24 May 2021 / Approved: 26 May 2021 / Online: 26 May 2021 (07:51:35 CEST)

How to cite: Beyreuther, E.; Ratzenberger, J.; Roeper, M.; Kirbus, B.; Rüsing, M.; Ivleva, L.I.; Eng, L.M. Photoconductivity in Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals. Preprints 2021, 2021050621 Beyreuther, E.; Ratzenberger, J.; Roeper, M.; Kirbus, B.; Rüsing, M.; Ivleva, L.I.; Eng, L.M. Photoconductivity in Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals. Preprints 2021, 2021050621

Abstract

In the last two decades, variably doped strontium barium niobate (SBN) has attracted a lot of scientific interest mainly due to its specific non-linear optical response. Comparably, the parental compound, i.e., undoped SBN, appears to be less studied so far. Here, two different cuts of single-crystalline nominally pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are comprehensively studied and analyzed with regard to their photoconductive responses. We present conductivity measurements under systematically varied illumination conditions along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced photoconductivity (PC) already under daylight and a large effect upon super-bandgap illumination in general, we observe (i) distinct spectral features when sweeping the excitation wavelength over the sub-bandgap region as then discussed in the context of deep and shallow trap states, (ii) extremely slow long-term relaxation for both light-on and light-off transients in the range of hours and days, (iii) a critical dependence of the photoresponse on the pre-illumination history of the sample, and (iv) a current-voltage hysteresis depending on both the illumination and the electrical-measurement conditions in a complex manner.

Subject Areas

strontium barium niobate; Sr0.61Ba0.39Nb2O6; SBN; I-V hysteresis; photoconductivity; photorelaxation; trap states

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