LabAdviser/Technology Research/Fabrication of Hyperbolic Metamaterials using Atomic Layer Deposition/AZO gratings: Difference between revisions
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=====Atomic Layer Deposition===== | =====Atomic Layer Deposition===== | ||
The AZO coatings were made in a thermal, hot-wall ALD system (Picosun R200). The precursors were obtained from Strem Chemicals. ZnO was deposited using diethylzinc (Zn (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>, DEZ) and deionized water (H<sub>2</sub>O), whereas Al doping of the ZnO was introduced by a single cycle of trimethylaluminium (Al(CH<sub>3</sub>)<sub>3</sub>, TMA) and H<sub>2</sub>O into a ZnO matrix made by 20 cycles of “DEZ +H<sub>2</sub>O”. This defines an AZO macrocycle: 20 cycles of “DEZ+H<sub>2</sub>O” and one cycle of “TMA+H<sub>2</sub>O”. The deposition temperature was kept constant at 200°C. Approximately 55 AZO macrocycles need to be deposited in order to fill the Si trench template entirely. | The AZO coatings were made in a thermal, hot-wall ALD system (Picosun R200). The precursors were obtained from Strem Chemicals. ZnO was deposited using diethylzinc (Zn (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>, DEZ) and deionized water (H<sub>2</sub>O), whereas Al doping of the ZnO was introduced by a single cycle of trimethylaluminium (Al(CH<sub>3</sub>)<sub>3</sub>, TMA) and H<sub>2</sub>O into a ZnO matrix made by 20 cycles of “DEZ +H<sub>2</sub>O”. This defines an AZO macrocycle: 20 cycles of “DEZ+H<sub>2</sub>O” and one cycle of “TMA+H<sub>2</sub>O”. The deposition temperature was kept constant at 200°C. Approximately, 55 AZO macrocycles need to be deposited in order to fill the Si trench template entirely. | ||
=====Top layer removal and selective etch of the Si template===== | =====Top layer removal and selective etch of the Si template===== | ||