Switchable Ferroelectric Diode and Photovoltaic Effect in BiFeO3

被引：1750

作者：

Choi, T.

Lee, S.

Choi, Y. J.

Kiryukhin, V.

Cheong, S. -W. ^{[1
]}

机构：

[1] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA

来源：

SCIENCE | 2009年 / 324卷 / 5923期

基金：

美国国家科学基金会;

关键词：

OPTICAL RECTIFICATION;

D O I：

10.1126/science.1168636

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：

Unidirectional electric current flow, such as that found in a diode, is essential for modern electronics. It usually occurs at asymmetric interfaces such as p-n junctions or metal/semiconductor interfaces with Schottky barriers. We report on a diode effect associated with the direction of bulk electric polarization in BiFeO3: a ferroelectric with a small optical gap edge of similar to 2.2 electron volts. We found that bulk electric conduction in ferroelectric monodomain BiFeO3 crystals is highly nonlinear and unidirectional. This diode effect switches its direction when the electric polarization is flipped by an external voltage. A substantial visible-light photovoltaic effect is observed in BiFeO3 diode structures. These results should improve understanding of charge conduction mechanisms in leaky ferroelectrics and advance the design of switchable devices combining ferroelectric, electronic, and optical functionalities.

引用

页码：63 / 66

页数：4

共 21 条

[1] OPTICAL RECTIFICATION [J].