Interface modulated currents in periodically proton exchanged Mg doped lithium niobate

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Title: Interface modulated currents in periodically proton exchanged Mg doped lithium niobate
Authors: Neumayer, Sabine M.
Manzo, Michele
Kholkin, Andrei L.
Gallo, Katia
Rodriguez, Brian J.
Permanent link: http://hdl.handle.net/10197/7989
Date: 21-Mar-2016
Abstract: Conductivity in Mg doped lithium niobate (Mg:LN) plays a key role in the reduction of photorefraction and therefore doping is widely exploited in optical devices. However, charge transport through Mg:LN and across interfaces such as electrodes also yields potential electronic applications in devices with switchable conductivity states. Furthermore, the introduction of proton exchanged (PE) phases in Mg:LN enhances ionic conductivity thus providing tailorability of conduction mechanisms and functionality dependent on sample composition. To facilitate the construction and design of such multifunctional electronic devices based on periodically PE Mg:LN or similar ferroelectric semiconductors, fundamental understanding of charge transport in these materials, as well as the impact of internal and external interfaces is essential. In order to gain insight into polarization and interface dependent conductivity due to band bending, UV illumination, and chemical reactivity, multi composite wedge shaped samples consisting of polar orientated Mg:LN and PE phases, were investigated using conductive atomic force microscopy. In Mg:LN, three conductivity states (on/off/transient) were observed under UV illumination, controllable by the polarity of the sample and the externally applied electric field. Measurements of currents originating from electrochemical reactions at metal electrode - PE phase interfaces demonstrate a memresistive and rectifying capability of the PE phase. Furthermore, internal interfaces such as domain walls and Mg:LN - PE phase boundaries were found to play a major role in the accumulation of charge carriers due to the polarization gradients, which can lead to increased currents. The insight gained from these findings yield the potential for multifunctional applications such as switchable UV sensitive micro- and nanoelectronic devices and bistable memristors.
Funding Details: European Commission - Seventh Framework Programme (FP7)
Type of material: Journal Article
Publisher: AIP Publishing
Copyright (published version): 2016 AIP Publishing LLC
Keywords: Lithium niobate;Proton exchange;Ferroelectric semiconductor;Photovoltaic current;Solid electrolyte;Domain walls;Conducting atomic force microscopy
DOI: 10.1063/1.4943934
Language: en
Status of Item: Peer reviewed
Appears in Collections:Conway Institute Research Collection
Physics Research Collection

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