Part · semiconductors

Patterned gallium arsenide wafer

Pattern and interconnect one epitaxial GaAs HBT amplifier wafer Discovery hypothesis; caller demands and physical qualification remain open.

Discovered · unresearchedClosure: OpenInventory incomplete

Capability requirements and tolerances

Consumer-specific numerical targets, quantities and acceptance limits remain open or incompletely reviewed. No smartphone-grade suitability is claimed. Distinct capability tiers require their own making route and qualification.

Making steps · draft selected for navigation; not a validated fabrication specification.

Known Parts and Tools

The selected route supplies this page's inventory and the map's dependency links from one record. Further requirements may be missing; review flags do not prove physical suitability.

Requirement	Role	Use	Relationship status
HBT epitaxial wafer	Part	incorporated; allocation and losses open	Cycle-checked; compatibility unknown
Compound semiconductors	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Dielectric precursor stock	Part	consumed; replenishment and waste open	Cycle-checked; compatibility unknown
Etch process gases	Part	consumed; replenishment and waste open	Cycle-checked; compatibility unknown
Analytical instruments	Tool	reused for verification/calibration; independent origin required	Cycle-checked; compatibility unknown
Exposure equipment	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Reticle/master pattern	Part	incorporated; allocation and losses open	Cycle-checked; compatibility unknown
Photoresist	Part	consumed; replenishment and waste open	Cycle-checked; compatibility unknown
Photoresist developer	Part	consumed; replenishment and waste open	Cycle-checked; compatibility unknown
Etching equipment	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Deposition equipment	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Interconnect deposition stock	Part	consumed; replenishment and waste open	Cycle-checked; compatibility unknown
Vacuum systems	Tool	reused facility/utility capacity; earlier supply required	Cycle-checked; compatibility unknown
Gas handling	Tool	reused facility/utility capacity; earlier supply required	Cycle-checked; compatibility unknown
Cooling systems	Tool	reused facility/utility capacity; earlier supply required	Cycle-checked; compatibility unknown
Regulated power	Tool	reused facility/utility capacity; earlier supply required	Cycle-checked; compatibility unknown
Probe leads	Part	incorporated; allocation and losses open	Cycle-checked; compatibility unknown
Cleanroom	Tool	reused facility/utility capacity; earlier supply required	Cycle-checked; compatibility unknown
Cleaning equipment	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Pure water	Part	consumed; replenishment and waste open	Cycle-checked; compatibility unknown
Ventilation	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Workshop surfaces	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Containers	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Handling assembly	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown

Making outline

Pattern one HBT mesa/isolation/contact architecture.
Deposit contacts, interconnect and passivation using compatible sequence.
Probe witness circuits before PA die singulation.

What remains unresolved

Discovery hypothesis only: quantitative demands, full recipe, quantities, losses, compatibility and acceptance remain to be researched.
Backside thinning/vias/heat extraction process and compatible contact metallurgy remain unexpanded.
Full inventory, quantities, losses, capability compatibility and acceptance remain unreviewed.

Sources and leads

Source scope and research notes determine which claims have been checked. A URL does not establish a complete making route.

InGaP HBT technology for RF and microwave instrumentation

Canonical reuse assessment

{
  "existing_candidates_checked": [
    "processed-gaas-wafer"
  ],
  "decision": "Replace bare-substrate doping shortcut with actual epitaxial device structure; pHEMT alternative unselected.",
  "availability": "No candidate is asserted built or suitable; qualification, copies, cleanliness and schedule remain open.",
  "identity_search": "Canonical IDs, aliases/functions and all JSON proposals searched before new ID request; approved for staging by coordinator."
}

Proposed capability specification

{
  "function": "Pattern and interconnect one epitaxial GaAs HBT amplifier wafer",
  "quantity_dimensions": "not yet specified",
  "performance_precision_purity": "not yet specified",
  "interfaces_environment": "not yet specified",
  "acceptance": "Trial pieces must meet caller demand with independent references; numerical limits not yet specified."
}

Earlier research provenance

proposals/2026-10-08-discovery/electronics/report.md
proposals/2026-10-08-discovery/camera-rf/report.md; coordinator candidate-union revision 2

Return to the discovered map

Used by

Items that directly require this item in their selected inventory.

Radio power amplifier die

Paths from Smartphone

These routes together include every item that can lead from Smartphone to this item. Repeated path combinations are collapsed; recipes are omitted.

Shortest route: Smartphone → Main board → RF front end → Radio power amplifiers → Radio power amplifier die → Patterned gallium arsenide wafer

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