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Local Schottky contacts of embedded Ag nanoparticles in Al 2 O 3 /SiN x :H stacks on Si: a design to enhance field effect passivation of Si junctions.
Nanotechnology 2018 July 14
This paper describes an original design leading to the field effect passivation of Si n+ -p junctions. Ordered Ag nanoparticle (Ag-NP) arrays with optimal size and coverage fabricated by means of nanosphere lithography and thermal evaporation, were embedded in ultrathin-Al2 O3 /SiN x :H stacks on the top of implanted Si n+ -p junctions, to achieve effective surface passivation. One way to characterize surface passivation is to use photocurrent, sensitive to recombination centers. We evidenced an improvement of photocurrent by a factor of 5 with the presence of Ag NPs. Finite-difference time-domain (FDTD) simulations combining with semi-quantitative calculations demonstrated that such gain was mainly due to the enhanced field effect passivation through the depleted region associated with the Ag-NPs/Si Schottky contacts.
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