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Porous Silicon Nanowire Arrays for Reversible Optical Gas Sensing
Author(s) -
Georgobiani Veronika A.,
Gonchar Kirill A.,
Zvereva Elena A.,
Osminkina Liubov A.
Publication year - 2018
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.201700565
Subject(s) - porous silicon , dangling bond , materials science , silicon , photoluminescence , etching (microfabrication) , nanowire , adsorption , isotropic etching , wafer , desorption , nanotechnology , optoelectronics , chemical engineering , analytical chemistry (journal) , layer (electronics) , chemistry , organic chemistry , engineering
Porous silicon nanowire arrays are shown to be used for optical detection of molecular oxygen (O 2 ). The samples are produced by metal assisted chemical etching of heavily boron‐doped wafers of crystalline silicon. It is found that the photoluminescence signal from porous silicon nanowires quenched in O 2 ambience but restored again in N 2 atmosphere, which repeated in several cycles. Electron paramagnetic resonance data demonstrate that number of silicon dangling bonds (Pb‐center) increases after O 2 adsorption, but then drops in vacuum. The experimental results are explained by a microscopic model taking into account the reversible charging/recharging of surface defects (Pb‐centers) due to the oxygen adsorption/desorption. The obtained results indicate that porous silicon nanowires are prospective for applications as reversible optical gas sensor.