What it is
Material quantities per chip are tiny; the binding constraints are purity and the number of qualified suppliers, not tonnage. A single contaminated gas shipment can idle a fab.
The material bill
Scale it up →Quantities are per 300 mm waferindicative range
| Material | Low | High | Unit | Basis |
|---|---|---|---|---|
| Silicon critical | 0.12 | 0.15 | kg | One 300 mm wafer weighs about 125 g |
| Hafnium critical Milligrams per wafer, with no substitute. | trace | trace | kg | Atomic-layer gate dielectric |
| Helium Consumed as gas, not incorporated. | trace | trace | kg | Process cooling and leak detection |
| High-Purity Quartz Consumption is per ingot, not per wafer. | trace | trace | kg | Consumed as crucible during crystal growth |
| Tungsten critical Grams per wafer. | trace | trace | kg | Contacts and vias |
Indicative range compiled from published technology studies and chemistry; verify against a manufacturer specification before use. Rows marked “trace” contain the material in quantities too small to state usefully as a mass — the constraint there is purity or supplier count, not tonnage.
The alternatives
Substitution is the most underrated force in materials. When a metal gets expensive or politically difficult, engineers design around it — and demand for a whole mine can evaporate.
Cadmium Telluride Thin-Film Module
A solar panel a few microns thick, using no silicon at all.
Crystalline Silicon Solar Module
The standard solar panel: silicon wafers, silver contact paste, glass and an aluminium frame.
Gallium Nitride Power Device
A switch that turns on and off far faster than silicon, so power supplies can shrink.