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Enhanced photovoltaic currents in strained Fe‐doped LiNbO 3 films
Author(s) -
Inoue Ryotaro,
Takahashi Shusuke,
Kitanaka Yuuki,
Oguchi Takeshi,
Noguchi Yuji,
Miyayama Masaru
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532398
Subject(s) - materials science , density functional theory , doping , strain (injury) , photovoltaic system , tensile strain , ultimate tensile strength , thin film , displacement (psychology) , condensed matter physics , optoelectronics , composite material , nanotechnology , computational chemistry , chemistry , physics , medicine , ecology , biology , psychology , psychotherapist
We investigate the impact of strain on photovoltaic current ( J z ) characteristics for iron‐doped LiNbO 3 (Fe‐LN) under visible light illumination by thin‐film experiments. The J z values are demonstrated to be dramatically enhanced for the film with a tensile strain along the P s direction, which is over 500 times as large as that of the bulk (strain‐free) Fe‐LN crystals. Density functional theory (DFT) calculations show that the tensile strain increases an off‐center displacement of Fe 2+ that is opposite to the P s direction. Our experimental and DFT study demonstrates that the control of the lattice strain is effective in enhancing the photovoltaic effect in the Fe‐LN system.