X-ray Irradiation Induced Reversible Resistance Change in Pt/TiO2/Pt Cells

Title
X-ray Irradiation Induced Reversible Resistance Change in Pt/TiO2/Pt Cells
Authors
Seo Hyoung ChangJungho KimCharudatta PhatakKenneth D'Aquila김성근Jiyoon KimSeul Ji SongCheol Seong HwangJeffrey A. EastmanJohn W. FreelandSeungbum Hong
Keywords
x-ray; resistance change; TiO2; resistive switching; X-ray irradiation; photovoltaic effect; Magneli phase; Joule heating; defect generation
Issue Date
2014-02
Publisher
ACS Nano
Citation
VOL 8, NO 2, 1584-1589
Abstract
The interaction between X-rays and matter is an intriguing topic for both fundamental science and possible applications. In particular, synchrotronbased brilliant X-ray beams have been used as a powerful diagnostic tool to unveil nanoscale phenomena in functional materials. However, it has not been widely investigated how functional materials respond to the brilliant X-rays. Here, we report the X-ray-induced reversible resistance change in 40-nm-thick TiO2 films sandwiched by Pt top and bottom electrodes, and propose the physical mechanism behind the emergent phenomenon. Our findings indicate that there exists a photovoltaic-like effect, which modulates the resistance reversibly by a few orders of magnitude, depending on the intensity of impinging X-rays. We found that this effect, combined with the X-ray irradiation induced phase transition confirmed by transmission electron microscopy, triggers a nonvolatile reversible resistance change. Understanding X-ray-controlled reversible resistance changes can provide possibilities to control initial resistance states of functional materials, which could be useful for future information and energy storage devices.
URI
http://pubs.kist.re.kr/handle/201004/47321
ISSN
19360851
Appears in Collections:
KIST Publication > Article
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