We
demonstrated high responsivity metal–semiconductor–metal
(MSM) solar-blind photodetectors by integrating exfoliated β-Ga2O3 microlayers with graphene, which is a deep ultraviolet
(UV) transparent and conductive electrode. Photodetectors with MSM
structures commonly suffer from low responsivity, although they feature
a facile fabrication process, low dark current, and fast response
speed. The β-Ga2O3 MSM solar-blind photodetectors
with graphene electrodes exhibited excellent operating characteristics
including higher responsivity (∼29.8 A/W), photo-to-dark current
ratio (∼1 × 106%), rejection ratio (R
254nm/R
365nm, ∼9.4
× 103), detectivity (∼1 × 1012 Jones), and operating speed to UV-C wavelengths, compared with MSM
photodetectors with conventional metal electrodes. Absence of shading
by the integration of graphene with β-Ga2O3 allows maximum exposure to the incident photons, suggesting a great
potential for deep UV optoelectronic applications.
Manganese-nickel (Mn-Ni) oxide films were electrodeposited on a graphite sheet in a bath consisting of manganese acetate and nickel chloride, and the structural, morphological, and electrochemical properties of these films were investigated. The electrodeposited Mn-Ni oxide films had porous structures covered with nanofibers. The X-ray diffractometer pattern revealed the presence of separate manganese oxide (γ-MnO2) and nickel oxide (NiO) in the films. The electrodeposited Mn-Ni oxide electrode exhibited a specific capacitance of 424 F/g in Na2SO4 electrolyte. This electrode maintained 86% of its initial specific capacitance over 2000 cycles of the charge-discharge operation, showing good cycling stability.
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.