Surface effects on the photoconducting properties of SrTiO3 thin films

被引：1

作者：

Bachi, N. ^{[1
]}

Bridoux, G. ^{[1
,2
]}

Villafuerte, M. ^{[1
,2
]}

Ferreyra, J. M. ^{[1
]}

Kim, J. ^{[3
]}

Figueroa, C. ^{[1
]}

Heluani, S. P. ^{[1
]}

机构：

[1] Univ Nacl Tucuman, Fac Ciencias Exactas & Tecnol, Lab Fis Solido, RA-4000 San Miguel De Tucuman, Argentina

[2] Univ Nacl Tucuman, CONICET, RA-4000 San Miguel De Tucuman, Argentina

[3] Neocera LLC, 10000 Virginia Manor Rd, Beltsville, MD 20705 USA

来源：

APPLIED PHYSICS LETTERS | 2017年 / 110卷 / 09期

关键词：

2-DIMENSIONAL ELECTRON-GAS; TRANSITION; LIQUID;

D O I：

10.1063/1.4976944

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report a study of the photoconducting properties of semiconducting SrTiO3 thin films. The photoconducting spectrum shows a pronounced rise around 3.2 eV with a typical indirect gap dependence, involving a transversal optical phonon of 25 meV. While these features remain unaltered under the influence of an applied electric field in ambient conditions, in a vacuum the rest of the spectrum does not, shifting to lower energies for higher electric fields. Time dependent photoconductivity response while illumination is applied confirms the loss of efficiency of the 3.7 eV transition. At low-temperatures, the photoconducting spectrum at low-electric fields has striking similarities to the ones at room-temperature for high-electric fields. This ability to control the photoconducting response through external parameters is explained considering a model of a downward band bending generated by oxygen vacancies at the surface in concomitant with recent findings at the surface of SrTiO3. Published by AIP Publishing.

引用

页数：4

共 50 条

[31] Electric properties of SrTiO3 thin films prepared by RF sputtering
Kuroiwa, Takeharu
Honda, Toshihisa
Watarai, Hisao
Sato, Ken
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 1992, 31 (9 B): : 3025 - 3028
[32] Dielectric properties of pulsed laser deposited SrTiO3 thin films
Clark, A.M.
Hao, Jianhua
Si, Weidong
Xi, X.X.
Materials Research Society Symposium - Proceedings, 1999, 541 : 77 - 82
[33] The dielectric properties of pulsed laser deposited SrTiO3 thin films
He, SM
Li, DH
Deng, XW
Liu, XZ
Zhang, Y
Li, YR
MICROELECTRONIC ENGINEERING, 2003, 66 (1-4) : 891 - 895
[34] Phenomenological description of thin SrTiO3 films
Shirokov, V. B.
Yuzyuk, Yu. I.
Lemanov, V. V.
PHYSICS OF THE SOLID STATE, 2009, 51 (05) : 1025 - 1032
[35] Amorphous and nanocrystalline SrTiO3 thin films
Bundesanstalt fuer Materialforschung, und-pruefung BAM, Berlin, Germany
J Non Cryst Solids, (150-154):
[36] Dielectric properties of pulsed laser deposited SrTiO3 thin films
Clark, AM
Hao, JH
Si, WD
Xi, XX
FERROELECTRIC THIN FILMS VII, 1999, 541 : 77 - 82
[37] Local ferroelectricity in SrTiO3 thin films
Tikhomirov, Oleg
Jiang, Hua
Levy, Jeremy
Physical Review Letters, 2002, 89 (14) : 1 - 147601
[38] Phenomenological description of thin SrTiO3 films
V. B. Shirokov
Yu. I. Yuzyuk
V. V. Lemanov
Physics of the Solid State, 2009, 51 : 1025 - 1032
[39] Effects of buffer layer thickness and strain on the dielectric properties of epitaxial SrTiO3 thin films
James, AR
Xi, XX
JOURNAL OF APPLIED PHYSICS, 2002, 92 (10) : 6149 - 6152
[40] Electrical conductivity and segregation effects of doped SrTiO3 thin films
Ohly, C
Hoffmann-Eifert, S
Szot, K
Waser, R
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2001, 21 (10-11) : 1673 - 1676

← 1 2 3 4 5 →