Photoinduced Negative Differential Resistivity and Gunn Oscillations in SrTiO3

SrTiO3, a perovskite oxide, holds significant potential for application in the field of oxide electronics. Notably, its photoelectric activity in the low temperature regime, which overlaps with the quantum paraelectric state, exhibits remarkable characteristics. In this study, it is demonstrated tha...

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Bibliographic Details
Published in:Advanced science 2023-12, Vol.10 (35), p.e2306420-n/a
Main Authors: Soleimany, Mehrzad, Alexe, Marin
Format: Article
Language:English
Subjects:
Energy
Gunn oscillation
Investigations
negative differential resistance
photo‐conductivity
Semiconductors
Temperature
transferred‐electron devices
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Summary:SrTiO3, a perovskite oxide, holds significant potential for application in the field of oxide electronics. Notably, its photoelectric activity in the low temperature regime, which overlaps with the quantum paraelectric state, exhibits remarkable characteristics. In this study, it is demonstrated that when photo‐excited with above band gap energy photons, SrTiO3 exhibits non‐linear transport of photocarriers and voltage‐controlled negative resistance, resulting from an intervalley transfer of photo‐induced electrons. As a consequence of the negative resistance, the photocurrent becomes unstable and spontaneously gives rise to low frequency Gunn‐like oscillations. SrTiO3 crystals exhibit non‐linear transport of photo‐carriers excited with above band photons, generating a voltage‐controlled negative resistance stemming from an intervalley transfer of photo‐induced electrons. As a consequence of the negative resistance, the photocurrent becomes unstable and spontaneously gives rise to low frequency Gunn‐like oscillations.
ISSN:2198-3844
2198-3844
DOI:10.1002/advs.202306420