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Substantially improved energy density of SrTiO3 thin film by cyclic cooling-heating and interfacial blocking effect

Abstract

Breakdown strength and energy storage performance of SrTiO3 thin film were substantially improved by the means of two different modifications on micro and macro level. From the micro elevel, cyclic cooling-heating process could cause repeatedly displacement of interstitial atoms, resulting in that the interstitial atoms returned to original defect location and the internal defects were restored. On the macro elevel, a blocking layer with high resistivity was generated between the Al top electrode and SrTiO3 thin film, which could effectively prevent the charge carrier at the interface. Afer micro and macro modification, electrode damage caused by edge effect could be effectively restrained and the space charge limited conductance (SCLC) mechanism was almost eliminated. Thermally stimulated depolarization current (TSDC) spectrum provided powerful evidence to testify that the quantity of the trap was sharply decreased after cyclic cooling-heating. As a result of the defect restoration as well as the interfacial blocking effect, the leakage current was decreased one order magnitude and the breakdown strength was enhanced from 142.8MV m-1 to 607.1MV m-1. More importantly, the ultimate energy density is up to 30.31 J cm-3, which is 1132% greater than the the sample without micro and macro modification.

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Publication details

The article was received on 14 Apr 2018, accepted on 11 Jun 2018 and first published on 12 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC01748D
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Substantially improved energy density of SrTiO3 thin film by cyclic cooling-heating and interfacial blocking effect

    W. Gao, M. Yao and X. Yao, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01748D

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