Publications by authors named "Johann Wolfgang Bartha"
Article Synopsis
- This study explores the creation of faceted pyramidal structures through anisotropic etching in amorphous silicon dioxide and glass, which is a surprising behavior compared to traditional silicon etching methods.
- The observed anisotropic etching is influenced by thin metal layers, leading to significantly faster lateral etch rates compared to vertical rates, with factors varying from 6-43 for liquid and 59 for vapor-based processes.
- This innovative process enables the production of shallow-angle pyramids, which can enhance light coupling efficiency in LEDs and solar cells, and be used for specialized applications like creating atomic force microscopy tips and potential surface plasmonics.
Graphene has been proposed as the current controlling element of vertical transport in heterojunction transistors, as it could potentially achieve high operation frequencies due to its metallic character and 2D nature. Simulations of graphene acting as a thermionic barrier between the transport of two semiconductor layers have shown cut-off frequencies larger than 1 THz. Furthermore, the use of n-doped amorphous silicon, (n)-a-Si:H, as the semiconductor for this approach could enable flexible electronics with high cutoff frequencies.
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