Dopants, Implantation & Diffusion Materials
Dopants, implantation and diffusion materials are used to control conductivity type, carrier concentration, resistivity, junction depth and electrical performance in semiconductor materials. They are widely used in wafer processing, epitaxy, thin-film deposition, power devices, compound semiconductors, optoelectronic devices and laboratory research.
This category includes semiconductor dopant materials in different elements, chemical systems and physical forms, including boron, phosphorus, arsenic, antimony, aluminum, gallium, magnesium, zinc, nitrogen, silicon and other specialty dopants. Products can be used for thermal diffusion, ion implantation, spin-on doping, epitaxial doping, chemical vapor deposition, physical vapor deposition and other material-modification processes.
Choose a suitable dopant source, diffusion source, implantation material or deposition precursor according to the target substrate, conductivity type, doping depth, process temperature, material form, purity level and equipment delivery method.
Show More About Dopants, Implantation & Diffusion Materials
Dopant Material Types
| Material System | Common Materials | Typical Application Direction |
|---|---|---|
| Boron-based materials | Boron, boron oxide, boric acid, diborane and boron-containing spin-on dopants | p-type silicon, silicon carbide and other semiconductor doping |
| Phosphorus-based materials | Phosphorus, red phosphorus, phosphorus pentoxide, phosphoric acid, phosphorus oxychloride and phosphine | n-type diffusion, ion implantation and epitaxial doping |
| Arsenic-based materials | Arsenic, arsenic oxides, arsine and arsenic-containing source materials | Highly doped n-type regions, shallow junctions and selected compound-semiconductor processes |
| Antimony-based materials | Antimony, antimony oxides and antimony-containing source materials | Low-diffusion n-type doping and highly doped contact regions |
| Aluminum-based materials | Aluminum, aluminum oxide, trimethylaluminum and other aluminum precursors | Silicon carbide, nitride semiconductors and p-type thin-film doping |
| Gallium-based materials | Gallium, gallium oxide, trimethylgallium and other gallium precursors | Compound semiconductors, epitaxial layers and functional films |
| Magnesium-based materials | Magnesium, bis(cyclopentadienyl)magnesium and other magnesium precursors | p-type gallium nitride and related nitride semiconductors |
| Zinc-based materials | Zinc, zinc oxide, zinc compounds and zinc precursors | Compound semiconductors, transparent conductive films and functional layers |
| Nitrogen-based materials | Nitrogen, ammonia, nitrogen plasma sources and nitrogen-containing precursors | Nitride semiconductors and selected thin-film processes |
| Silicon-based materials | Silicon, silane and other silicon precursors | n-type nitride layers, epitaxy and thin-film doping |
| Transition-metal materials | Titanium, vanadium, chromium, manganese, iron, nickel, copper and related sources | Functional semiconductors, sensors and specialty electronic materials |
| Rare-earth materials | Europium, erbium, terbium and related compounds | Luminescent, photonic and specialty functional materials |
Materials by Process Use
| Process Use | Available Material Forms | Common Materials |
|---|---|---|
| Thermal diffusion | Powders, granules, oxides, liquid sources and source wafers | Boron oxide, phosphorus pentoxide, arsenic oxide, antimony oxide, boric acid and phosphoric acid |
| Ion implantation | Elemental sources, solid sources, gas sources and ion-source materials | Boron, phosphorus, arsenic, antimony, aluminum and nitrogen |
| Spin-on doping | Solutions, liquid precursors and heat-treatable dopant films | Boron-, phosphorus-, arsenic- and antimony-containing spin-on materials |
| Epitaxial growth | Gases, metal-organic precursors and liquid precursors | Diborane, phosphine, arsine, ammonia, trimethylaluminum, trimethylgallium and bis(cyclopentadienyl)magnesium |
| Chemical vapor deposition | Gas-phase precursors and volatile liquid sources | Silane, ammonia, phosphine, arsine and metal-organic compounds |
| Sputtering and evaporation | Elemental, alloy, ceramic and composite targets | Boron, aluminum, gallium, zinc, oxide and composite dopant targets |
| Source-wafer diffusion | Coated source wafers, dopant wafers and composite source wafers | Boron, phosphorus, arsenic and antimony source wafers |
Materials by Semiconductor Substrate
| Target Substrate | Common Dopant Systems | Typical Use |
|---|---|---|
| Silicon | Boron, phosphorus, arsenic and antimony | p-type and n-type regions, junction formation, contact regions and resistivity adjustment |
| Silicon carbide | Aluminum, boron, nitrogen and phosphorus | Power devices, epitaxial layers, implantation and high-temperature activation |
| Gallium nitride | Magnesium, silicon, oxygen, carbon and related precursors | p-type and n-type epitaxy, light-emitting devices and power devices |
| Gallium arsenide | Silicon, zinc, carbon, beryllium and magnesium | Compound-semiconductor junctions, epitaxial layers and optoelectronic devices |
| Indium phosphide | Zinc, sulfur, silicon, iron and related compounds | Optical communication, laser and high-speed electronic devices |
| Aluminum nitride | Silicon, oxygen, magnesium and other compatible precursors | Wide-bandgap films and epitaxial materials |
| Oxide semiconductors | Gallium, aluminum, indium, tin, zinc and transition metals | Transparent conductive films, sensors and functional thin films |
Materials by Physical Form
| Material Form | Suitable Characteristics | Common Products |
|---|---|---|
| High-purity elements | Ion sources, alloy preparation and material research | Boron, phosphorus, arsenic, antimony, aluminum, gallium and zinc |
| Powders and granules | Diffusion sources, loading and laboratory processes | Oxides, compounds and metallic dopant powders |
| Oxide diffusion sources | Thermal diffusion and source-wafer processes | Boron oxide, phosphorus pentoxide, arsenic oxide and antimony oxide |
| Liquid sources and solutions | Spin coating, liquid diffusion and selected deposition processes | Boric acid, phosphoric acid and liquid dopant solutions |
| Gas-phase precursors | Epitaxy and continuous delivery systems | Diborane, phosphine, arsine, ammonia and silane |
| Metal-organic precursors | MOCVD, epitaxy and thin-film deposition | Trimethylaluminum, trimethylgallium and bis(cyclopentadienyl)magnesium |
| Doped targets | Sputtering, evaporation and composite-film deposition | Metal, oxide and composite dopant targets |
Doping Concentration and Process Targets
| Process Target | Materials and Specifications to Consider |
|---|---|
| Light carrier adjustment | Low-concentration precursors, lightly doped crystals or films |
| Moderate-concentration regions | Standard diffusion sources, implantation sources and epitaxial precursors |
| Highly doped contact regions | High-concentration sources, arsenic- or antimony-based materials and heavily doped targets |
| Shallow junctions | Low-diffusivity materials, ion implantation sources and low-dose process options |
| Deep diffusion | High-temperature diffusion sources, liquid sources and solid sources |
| Concentration-gradient structures | Multiple-source combinations, staged delivery, co-deposition and multi-step diffusion materials |
| Compensated doping | Acceptor and donor combinations or composite precursor systems |
Purity, Packaging and Documentation
| Requirement | Relevant Information |
|---|---|
| Research-grade material | High purity, small laboratory packaging and basic batch information |
| Device-development material | Tighter control of metallic impurities and batch consistency |
| Epitaxy material | Precursor purity, stability, delivery method and container specifications |
| High-temperature diffusion material | Thermal stability, source-wafer dimensions and repeat-use requirements |
| Liquid dopant | Concentration, solvent system, water content and storage conditions |
| Gas-phase precursor | Cylinder or container specification, gas connection, transport and storage requirements |
| Custom material | Specified concentration, dimensions, formulation, packaging or blended system |
| Technical documents | SDS, certificate of analysis, purity statement, batch information and operating guidance |
Frequently Asked Questions
Why are the same dopant elements available as powders, source wafers, solutions and gases?
Different forms are designed for different delivery systems. Powders and oxides are commonly used as diffusion sources, source wafers are convenient for wafer-scale furnace processing, solutions are used for spin-on or liquid processes, and gases or metal-organic precursors are used in epitaxy and deposition equipment. The correct form depends on the available equipment and process configuration.
Why can the target resistivity still be missed when the dopant element is correct?
The final electrical result is also affected by concentration, diffusion time, temperature, activation annealing, substrate defects and compensating impurities. Materials with the same chemical element can produce different results when their purity, chemical form or concentration is different.
Can a liquid dopant still be used if it develops precipitation, discoloration or a viscosity change?
It should not be used without verification. Precipitation, color change or viscosity change may indicate concentration drift, solvent evaporation, moisture absorption or decomposition. Check the storage conditions, shelf life and product documentation before use.
Can a source wafer be reused after processing?
Reuse depends on the source-wafer type, process temperature, material consumption, surface contamination and supplier instructions. Reuse can change the delivered dopant amount and uniformity, so suitability should not be judged by appearance alone.
Why can diffusion results vary between furnace runs using the same material?
Tube cleanliness, gas flow, temperature uniformity, wafer placement, source position and thermal-processing time can all affect the result. For sensitive processes, the source-material batch and loading arrangement should also be controlled.
Why is annealing usually required after ion implantation?
Ion implantation can leave dopant atoms electrically inactive and can damage the crystal lattice. Annealing is commonly used to repair lattice damage and activate the dopant, but the appropriate temperature and time depend on the substrate and process system.
Why can deposition rate and dopant concentration change after changing precursor suppliers?
Purity, stabilizers, impurity levels, container condition and delivery behavior can vary between suppliers. Before changing the source, compare purity, impurity specifications, concentration, delivery conditions and batch data, then perform process validation.
Does a higher-purity material always work better for a device process?
Not necessarily. In addition to total purity, the material form, volatility, thermal decomposition behavior, equipment compatibility, packaging cleanliness and specific impurity profile must be considered. A high-purity material suitable for one process may not be suitable for another equipment configuration or substrate.
How can small-quantity dopant materials be protected from degradation after opening?
Store the material according to the specified temperature, humidity, light and inert-atmosphere requirements. Liquid and gas-phase precursors require particular attention to sealing, moisture content and container compatibility, while powders and oxides should be protected from moisture and cross-contamination.
What information is needed when purchasing a dopant for a specific substrate?
Provide the substrate material, target conductivity type, dopant element, process method, temperature range, expected quantity and equipment type. For silicon carbide, gallium nitride and other compound semiconductors, also identify whether the material will be used for epitaxy, implantation or deposition so that the appropriate material system can be matched.
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