Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation
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The influence of light illumination on the dielectric constant of CaCu3Ti4O12 (CCTO) polycrystals is studied in this work. When exposed to 405-nm laser light, a reversible enhancement in the room temperature capacitance as high as 22% was observed, suggesting application of light-sensitive capacitance devices. To uncover the microscopic mechanisms mediating this change, we performed electronic structure measurements, using photoemission spectroscopy, and measured the electrical conductivity of the CCTO samples under different conditions of light exposure and oxygen partial pressure. Together, these results suggest that the large capacitance enhancement is driven by oxygen vacancies induced by the irradiation.
Masingboon , C , Eknapakul , T , Suwanwong , S , Buaphet , P , Nakajima , H , Mo , S -K , Thongbai , P , King , P D C , Maensiri , S & Meevasana , W 2013 , ' Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation ' Applied Physics Letters , vol 102 , no. 20 , 202903 . DOI: 10.1063/1.4807741
Applied Physics Letters
Copyright 2013, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters, Vol 102, Issue 20, and may be found at: http://scitation.aip.org/content/aip/journal/apl/102/20/10.1063/1.4807741