To tackle this problem, this paper demonstrates an electrochemical nanoimprinting process for single-crystal semiconductors for directly etching 3D features into silicon wafers without the need for templates or lithographical steps. It is shown that stamps made of porous catalysts used in the imprinting process allows for better morphology control of the imprinted silicon which is attributed to increased pathways for diffusion of chemical species during imprinting. This process delivers low-defect density, and large-area patterning (>1 cm2) in a single imprinting operation. Further, it outperforms the resolution and scalability of leading serial (e.g. FIB, electron beam) and parallel (e.g. gray-scale lithography) methods altogether, allowing for fast replication of patterns onto hard materials from a soft or polymeric mold. This technique bypasses the need for dry etching and is potentially compatible with roll-to-roll platforms, amorphous and poly silicon and III-V semiconductors. In turn, it may pave the way for mold replication onto hard molds and the manufacturing of complex objects for infrared optics.
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Aliaksandr Sharstniou, Stanislau Niauzorau, Bruno Azeredo, "Electrochemical nanoimprinting of silicon: a direct patterning approach," Proc. SPIE 10584, Novel Patterning Technologies 2018, 105840Y (19 March 2018);