NDLI: Giant photovoltaic effects driven by residual polar field within unit-cell-scale LaAlO3 films on SrTiO3

Content Provider	PubMed Central
Author	Liang, Haixing Cheng, Long Zhai, Xiaofang Pan, Nan Guo, Hongli Zhao, Jin Zhang, Hui Lin, Li Zhang, Xiaoqiang Wang, Xiaoping Zeng, Changgan Zhang, Zhenyu Hou, J. G.
Copyright Year	2013
Abstract	For polar/nonpolar heterostructures, Maxwell's theory dictates that the electric potential in the polar components will increase divergently with the film thickness. For LaAlO3/SrTiO3, a conceptually intriguing route, termed charge reconstruction, has been proposed to avert such “polar catastrophe”. The existence of a polar potential in LaAlO3 is a prerequisite for the validity of the charge reconstruction picture, yet to date, its direct measurement remains a major challenge. Here we establish unambiguously the existence of the residual polar potential in ultrathin LaAlO3 films on SrTiO3, using a novel photovoltaic device design as an effective probe. The measured lower bound of the residual polar potential is 1.0 V. Such a direct observation of the giant residual polar potential within the unit-cell-scale LaAlO3 films amounts to a definitive experimental evidence for the charge reconstruction picture, and also points to new technological significance of oxide heterostructures in photovoltaic and sensing devices with atomic-scale control.
Related Links	http://dx.doi.org/10.1038/srep01975
Starting Page	1975
File Format	PDF
ISSN	20452322
e-ISSN	20452322
Journal	Scientific Reports
Volume Number	3
Language	English
Publisher	Nature Publishing Group
Publisher Date	2013-06-12
Access Restriction	Open
Rights Holder	Nature Publishing Group
Subject Keyword	Science and technology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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