Electronics
The only way to coat inside a hole fifty times deeper than it is wide is to make the chemistry stop by itself
22 Sept 2026 · 8 min read
Spraying, dipping and ordinary vapour deposition all coat the entrance of a deep narrow feature and starve the bottom. One technique does not, because each step saturates and refuses to continue — which turns film thickness from a rate you control into a number you count.
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