Indium gallium arsenide
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| Indium gallium arsenide | |
|---|---|
| Name | Indium gallium arsenide |
| Other names | InGaAs |
| Formula | In_xGa_1−xAs |
| Crystal system | Zinc blende |
| Band gap | Tunable (~0.36–1.42 eV) |
| Applications | Photodetectors, lasers, high-electron-mobility transistors |
Indium gallium arsenide Indium gallium arsenide is a ternary III–V semiconductor alloy used in optoelectronics and high-speed electronics. Developed through research at institutions such as Bell Labs, Massachusetts Institute of Technology, and Rutherford Appleton Laboratory, it offers a composition-dependent band gap and lattice parameter that enable device engineering for telecommunications and sensing. Commercialization by firms like Intel, II‑VI Incorporated, and Hamamatsu Photonics has driven its adoption in photodetectors, lasers, and focal plane arrays.
Introduction
Indium gallium arsenide appears in technologies ranging from fiber‑optic communications supported by Bell Labs innovations to spaceborne instruments deployed by European Space Agency missions. Early material studies at University of Cambridge and Stanford University explored ternary alloying effects known from predecessors such as Gallium arsenide and Indium arsenide. Industrial supply chains involving Intel, Rohm Semiconductor, and NTT facilitate integration into systems developed by Nokia, Ericsson, and Huawei for wavelengths standardized by the ITU-T grid.
Composition and Crystal Structure
The chemical formula In_xGa_1−xAs denotes variable stoichiometry studied in laboratories at Max Planck Society and Lawrence Berkeley National Laboratory. The alloy crystallizes in the zinc blende structure characteristic of III–V compounds, analogous to Gallium arsenide and Indium phosphide. Lattice matching strategies reference substrates such as Indium phosphide and Gallium arsenide wafers, with strain engineering techniques developed in collaboration between IBM Research and Tokyo Institute of Technology. Materials characterization uses methods advanced at Brookhaven National Laboratory and Argonne National Laboratory.
Electronic and Optical Properties
Band gap tuning across compositions enables emission and detection from near‑infrared telecom bands standardized by the International Telecommunication Union and exploited by companies like Ciena and Cisco Systems. Carrier mobility and effective mass parameters measured at Harvard University and Caltech compare favorably to Silicon for electron transport, informing device designs in research at Nokia Bell Labs and MIT Lincoln Laboratory. Optical absorption and refractive index dispersion are modeled with techniques originating from Bell Labs and validated in facilities operated by NIST and Fraunhofer Society.
Growth and Fabrication Methods
Epitaxial growth techniques include molecular beam epitaxy pioneered at Bell Labs and metal–organic chemical vapor deposition developed with contributions from DuPont and Chemical Vapor Deposition (CVD) community. Heterostructures and quantum wells using InGaAs are fabricated on InP and GaAs substrates at fabs operated by Intel and TSMC. Lithography and etching steps employ equipment from ASML Holding and Tokyo Electron with process control frameworks implemented at Semiconductor Research Corporation and IMEC.
Device Applications
InGaAs underpins photodetectors used in telecommunications by Nokia and Ericsson, short‑wave infrared cameras built by FLIR Systems and SOFRADIR, and lasers developed by IPG Photonics and Finisar Corporation. High‑electron‑mobility transistors leveraging InGaAs channels are investigated by Intel and Qualcomm for radio frequency front ends in smartphones produced by Apple Inc. and Samsung Electronics. Space and defense programs at NASA and DARPA use InGaAs focal plane arrays supplied to contractors such as Northrop Grumman and BAE Systems.
Material Challenges and Reliability
Reliability concerns studied at Sandia National Laboratories and Los Alamos National Laboratory include defect generation, diffusion of species at interfaces analyzed in projects with DARPA and NSF, and thermal stability evaluated under standards set by JEDEC. Lattice mismatch, dislocation formation, and alloy segregation are addressed by research collaborations between University of California, Santa Barbara and Cornell University. Long‑term device degradation mechanisms inform qualification protocols used by SpaceX and European Space Agency missions.
Safety and Environmental Considerations
Handling of arsenide compounds follows regulations from agencies such as the Environmental Protection Agency and European Chemicals Agency, with waste management guided by protocols used at Lawrence Livermore National Laboratory. Occupational exposure limits and material safety data sheets reference criteria promulgated by OSHA and NIOSH. Lifecycle analyses performed in partnerships between University of Michigan and MIT examine resource sourcing, recycling pathways similar to those in solar photovoltaic supply chains, and end‑of‑life strategies adopted by manufacturers like Intel and Samsung Electronics.