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Title: Activity of sub-band gap states in ferroelectric Pb(Zr0.2Ti0.8)O3 thin films
Author(s): Ramakrishnegowda, Niranjan
Yun, Yeseul
Knoche, David S.
Mühlenbein, Lutz
Li, Xinye
Bhatnagar, Akash
Issue Date: 2020
Type: Article
Language: English
Abstract: Defect or intermediate states within the band gap of ferroelectric oxides are known to impact functional characteristics such as saturated polarization. However, depending upon their respective position, such levels can also induce a substantial photoelectrical response under appropriate illumination and severely impact the conduction mechanism of an otherwise highly insulating material system. Sub-band-gap illumination is used to highlight the activity of these levels in epitaxially grown and ferroelectric Pb(Zr0.2Ti0.8)O3 thin films. Large transient effects are observed in relation to ferroelectric polarization and conductivity after illumination. In the case of polarization, light induces a “leaky” character, which eventually decays over a period of nearly 1.5 h. In conjunction, persistent photoconductivity is observed as the enhanced conductivity attained under illumination gradually decays over several minutes after removal of illumination. Thermally stimulated currents are measured to probe the presence of sub-band gap states and analyze their effect over a wide range of temperature. The trapping nature of the states and their role in the conduction is found to be the underlying origin.
Open Access: Open access publication
License: (CC BY-NC 4.0) Creative Commons Attribution NonCommercial 4.0(CC BY-NC 4.0) Creative Commons Attribution NonCommercial 4.0
Sponsor/Funder: Publikationsfonds MLU
Journal Title: Advanced electronic materials
Publisher: Wiley-VCH Verlag GmbH & Co. KG
Publisher Place: Weinheim
Volume: 6
Issue: 4
Original Publication: 10.1002/aelm.201900966
Appears in Collections:Open Access Publikationen der MLU

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