2 research outputs found
Intrinsic Defects, Fluctuations of the Local Shape, and the Photo-Oxidation of Black Phosphorus
Black phosphorus is a monatomic semiconducting
layered material
that degrades exothermically in the presence of light and ambient
contaminants. Its degradation dynamics remain largely unknown. Even
before degradation, local-probe studies indicate non-negligible local
curvatureî—¸through a nonconstant height distributionî—¸due
to the unavoidable presence of intrinsic defects. We establish that
these intrinsic defects are photo-oxidation sites because they lower
the chemisorption barrier of ideal black phosphorus (>10 eV and
out
of visible-range light excitations) right into the visible and ultraviolet
range (1.6 to 6.8 eV), thus enabling photoinduced oxidation and dissociation
of oxygen dimers. A full characterization of the material’s
shape and of its electronic properties at the early stages of the
oxidation process is presented as well. This study thus provides fundamental
insights into the degradation dynamics of this novel layered material
Intrinsic Defects, Fluctuations of the Local Shape, and the Photo-Oxidation of Black Phosphorus
Black phosphorus is a monatomic semiconducting
layered material
that degrades exothermically in the presence of light and ambient
contaminants. Its degradation dynamics remain largely unknown. Even
before degradation, local-probe studies indicate non-negligible local
curvatureî—¸through a nonconstant height distributionî—¸due
to the unavoidable presence of intrinsic defects. We establish that
these intrinsic defects are photo-oxidation sites because they lower
the chemisorption barrier of ideal black phosphorus (>10 eV and
out
of visible-range light excitations) right into the visible and ultraviolet
range (1.6 to 6.8 eV), thus enabling photoinduced oxidation and dissociation
of oxygen dimers. A full characterization of the material’s
shape and of its electronic properties at the early stages of the
oxidation process is presented as well. This study thus provides fundamental
insights into the degradation dynamics of this novel layered material