Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation

C. Masingboon; T. Eknapakul; S. Suwanwong; P. Buaphet; H. Nakajima; S. -K. Mo; P. Thongbai; P. D. C. King; S. Maensiri; W. Meevasana

doi:10.1063/1.4807741

Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation

C. Masingboon, T. Eknapakul, S. Suwanwong, P. Buaphet, H. Nakajima, S. -K. Mo, P. Thongbai, P. D. C. King, S. Maensiri, W. Meevasana^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	202903
Number of pages	5
Journal	Applied Physics Letters
Volume	102
Issue number	20
DOIs	https://doi.org/10.1063/1.4807741
Publication status	Published - 20 May 2013

Keywords

Copper-titanate
SRTIO3
Capacitance
Dielectric constant
Vacancies
Photoemission

Access to Document

10.1063/1.4807741

1.4807741
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
Final published version, 597 KB

Cite this

@article{57568ece0d3e4fc4b0e1a263bf1895a7,

title = "Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation",

abstract = "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.",

keywords = "Copper-titanate , SRTIO3, Capacitance, Dielectric constant, Vacancies, Photoemission",

author = "C. Masingboon and T. Eknapakul and S. Suwanwong and P. Buaphet and H. Nakajima and Mo, {S. -K.} and P. Thongbai and King, {P. D. C.} and S. Maensiri and W. Meevasana",

year = "2013",

month = may,

day = "20",

doi = "10.1063/1.4807741",

language = "English",

volume = "102",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "20",

}

TY - JOUR

T1 - Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation

AU - Masingboon, C.

AU - Eknapakul, T.

AU - Suwanwong, S.

AU - Buaphet, P.

AU - Nakajima, H.

AU - Mo, S. -K.

AU - Thongbai, P.

AU - King, P. D. C.

AU - Maensiri, S.

AU - Meevasana, W.

PY - 2013/5/20

Y1 - 2013/5/20

N2 - 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.

AB - 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.

KW - Copper-titanate

KW - SRTIO3

KW - Capacitance

KW - Dielectric constant

KW - Vacancies

KW - Photoemission

U2 - 10.1063/1.4807741

DO - 10.1063/1.4807741

M3 - Article

SN - 0003-6951

VL - 102

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 20

M1 - 202903

ER -

Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation

Abstract

Keywords

Access to Document

Fingerprint

Cite this