Strongly enhanced and tunable photovoltaic effect in ferroelectric-paraelectric superlattices

被引：24

作者：

Yun, Yeseul ^{[1
,2
]}

Muehlenbein, Lutz ^{[1
,2
]}

Knoche, David S. ^{[1
,2
]}

Lotnyk, Andriy ^{[3
,4
]}

Bhatnagar, Akash ^{[1
,2
]}

机构：

[1] Martin Luther Univ Halle Wittenberg, Zentrum Innovationskom Petenz SiLinano, D-06120 Halle, Germany

[2] Martin Luther Univ Halle Wittenberg, Inst Phys, D-06120 Halle, Germany

[3] Leibniz Inst Surface Engn IOM, D-04318 Leipzig, Germany

[4] Ningbo Univ, Lab Infrared Mat & Devices, Res Inst Adv Technol, Ningbo 315211, Peoples R China

来源：

SCIENCE ADVANCES | 2021年 / 7卷 / 23期

关键词：

BATIO3/SRTIO3; SUPERLATTICES; DIELECTRIC-PROPERTIES; PERSISTENT PHOTOCONDUCTIVITY; POLARIZATION ENHANCEMENT; NEGATIVE CAPACITANCE; ELECTRONIC-STRUCTURE; BARIUM-TITANATE; PHOTOLUMINESCENCE; EFFICIENCY; BATIO3;

D O I：

10.1126/sciadv.abe4206

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Ever since the first observation of a photovoltaic effect in ferroelectric BaTiO3, studies have been devoted to analyze this effect, but only a few attempted to engineer an enhancement. In conjunction, the steep progress in thin-film fabrication has opened up a plethora of previously unexplored avenues to tune and enhance material properties via growth in the form of superlattices. In this work, we present a strategy wherein sandwiching a ferroelectric BaTiO3 in between paraelectric SrTiO3 and CaTiO3 in a superlattice form results in a strong and tunable enhancement in photocurrent. Comparison with BaTiO3 of similar thickness shows the photocurrent in the superlattice is 10(3) times higher, despite a nearly two-thirds reduction in the volume of BaTiO3. The enhancement can be tuned by the periodicity of the superlattice, and persists under 1.5 AM irradiation. Systematic investigations highlight the critical role of large dielectric permittivity and lowered bandgap.

引用

页数：8

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