The fabrication and properties of n-ZnO nanowires/p-CuO coaxial heterojunction (CH) with a photoresist (PR) blocking layer are reported. In our study, c-plane wurtzite ZnO nanowires were grown by aqueous chemical method, and monoclinic CuO (111) was then coated on the ZnO nanowires by electrochemical deposition to form CH. To improve the device performance, a PR layer was inserted between the ZnO buffer layer and the CuO film to serve as a blocking layer to block the leakage current. Structural investigations of the CH indicate that the sample has good crystalline quality. It was found that our refined structure possesses a better rectifying ratio and smaller reverse leakage current. As there is a large on/off ratio between light on and off and the major light response is centered at around 424 nm, the experimental results suggest that the PR-inserted ZnO/CuO CH can be used as a good narrow-band blue light detector.
We
here demonstrate the multifunctional properties of atomically
thin heterojunctions that are enabled by their strong interfacial
interactions and their application toward self-powered sensors with
unprecedented performance. Bonding between tin diselenide and graphene
produces thermoelectric and mechanoelectric properties beyond the
ability of either component. A record-breaking ZT of 2.43 originated
from the synergistic combination of graphene’s high carrier
conductivity and SnSe2-mediated thermal conductivity lowering.
Moreover, spatially varying interaction at the SnSe2/graphene
interface produces stress localization that results in a novel 2D-crack-assisted
strain sensing mechanism whose sensitivity (GF = 450) is superior
to all other 2D materials. Finally, a graphene-assisted growth process
permits the formation of high-quality heterojunctions directly on
polymeric substrates for flexible and transparent sensors that achieve
self-powered strain sensing from a small temperature gradient. Our
work enhances the fundamental understanding of multifunctionality
at the atomic scale and provides a route toward structural health
monitoring through ubiquitous and smart devices.
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