Mixed-dimensional
van der Waals nanohybrids (MvNHs) of two-dimensional
transition-metal dichalcogenides (TMDs) and zero-dimensional perovskites
are highly promising candidates for high-performance photonic device
applications. However, the growth of perovskites over the surface
of TMDs has been a challenging task due to the distinguishable surface
chemistry of these two different classes of materials. Here, we demonstrate
a synthetic route for the design of MoSe2–CsPbBr3 MvNHs using a bifunctional ligand, i.e., 4-aminothiophenol.
Close contact between these two materials is established via a bridge
that leads to the formation of a donor–bridge–acceptor
system. The presence of the small conjugated ligand facilitates faster
charge diffusion across MoSe2–CsPbBr3 interfaces. Density functional theory calculations confirm the type-II
band alignment of the constituents within the MvNHs. The MoSe2–CsPbBr3 nanohybrids show much higher photocurrent
(∼2 × 104-fold photo-to-dark current ratio)
as compared to both pure CsPbBr3 nanocrystals and pristine
MoSe2 nanosheets owing to the synergistic effect of pronounced
light–matter interactions followed by efficient charge separation
and transportation. This study suggests the use of a bifunctional
ligand to construct a nanohybrid system to tune the optoelectronic
properties for potential applications in photovoltaic devices.
Heterostructures based on atomically thin twodimensional layered transition metal dichalcogenides are highly promising for optoelectronic device applications owing to their tunable optical and electronic properties. However, the synthesis of heterostructures with desired materials having proper interfacial contacts has been a challenging task. Here, we develop a colloidal synthetic route for the design of MoSe 2 −Cu 2 S nanoheterostructures, where the Cu 2 S islands grow vertically on top of the defect sites present on the MoSe 2 surface, thereby forming a vertical p−n junction having plasmonic characteristics. These MoSe 2 − Cu 2 S nanoheterostructures are used to fabricate photodetectors with superior photoresponse characteristics. The fabricated device exhibits a broad-band spectral photoresponse over the visible to near-infrared range with a peak responsivity of 410 mA W −1 at −2.0 V and over 3000-fold photo-to-dark current ratio. The superior device performance of MoSe 2 −Cu 2 S over only MoSe 2 devices is due to the combined effect of the formation of the p−n junction, pronounced light−matter interactions, and passivation of surface defects. This study would pave the way for designing a new class of nanoheterostructured materials for their potential applications in next-generation photonic devices.
The influence of cold rolling on the microstructural changes of 2205 duplex stainless steel was investigated. The steel samples revealed the presence of almost equal volume fraction of δ‐ferrite and austenite phase after hot rolling. During cold rolling, the above phase constituents became flattened, fragmented as well as transformed into acicular microstructural constituents with increasing amount of cold deformation. The transmission electron microscopy revealed the presence of strain‐induced α′ martensite, Moiré fringes, elongated worm‐like closed slip band channels and poorly developed dislocation cell structures. The volume percent of the constituent phases has been quantified by X‐ray diffraction analysis, which has also been substantiated by the image analysis result. The micro‐hardness measurement establishes that the work hardening capacity of austenite is more compared to ferrite.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.