Product Overview
Copper Gallium Sputtering Target (Cu/Ga) is an alloy sputtering target used to deposit composition-controlled alloy films. Relative to a pure elemental target, the alloying constituents are introduced to tune electrical, magnetic, optical, mechanical, or adhesion-related film properties. For this reason, alloy ratio, homogeneity, purity basis, and the intended film composition should be defined clearly in the procurement specification.
Material and Deposition Characteristics
Many alloy targets are electrically conductive and can be compatible with DC or pulsed-DC magnetron sputtering, subject to the actual alloy composition and equipment capability. The target composition is not always reproduced exactly in the deposited film because preferential sputtering, re-sputtering, substrate heating, and process gas conditions can shift the final ratio. For composition-sensitive work, deposited-film analysis should be part of process qualification.
Technical Data
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| Purity | 99.9% – 99.99% | High purity ensures stable semiconductor properties |
| Composition | Cu/Ga ratios customizable (e.g., 90/10, 80/20) | Controls film composition and device performance |
| Diameter | 25 – 300 mm (custom) | Compatible with common sputtering systems |
| Thickness | 3 – 6 mm | Influences sputtering rate and target lifespan |
| Density | ≥ 99% theoretical density | Improves film uniformity and sputtering stability |
| Bonding | Copper backing plate / Indium bonded | Enhances thermal conductivity and structural stability |
| Material | Key Advantage | Typical Application |
|---|---|---|
| Copper Gallium (Cu/Ga) | Adjustable alloy composition for semiconductor films | CIGS solar cell precursor layers |
| Copper (Cu) | Excellent electrical conductivity | Conductive thin films and electrodes |
| Gallium (Ga) | Semiconductor bandgap tuning | Compound semiconductor materials |
| Question | Answer |
|---|---|
| Can the Cu/Ga composition be customized? | Yes. The copper-to-gallium ratio can be adjusted to meet specific photovoltaic or semiconductor deposition requirements. |
| Are bonded sputtering targets available? | Yes. Copper backing plates with indium bonding are commonly used to improve thermal conductivity and target durability. |
| What sputtering methods are suitable for Cu/Ga targets? | Cu/Ga sputtering targets are typically used in DC magnetron sputtering and other PVD deposition techniques. |
| What purity levels are typically available? | Standard purity ranges from 99.9% to 99.99%, depending on application needs. |
| Can the target size be customized? | Yes. Targets can be manufactured in a wide range of diameters, thicknesses, and geometries for different deposition systems. |
Typical Thin-Film Applications
- Copper Gallium alloy films where composition control is important to electrical, mechanical, magnetic, or optical performance
- Multilayer stacks, adhesion/barrier layers, conductive films, or functional coatings depending on the alloy system
- Research and production programs that require customized alloy ratios and repeatable sputtering behavior
Target Configuration and Ordering Considerations
For quotation and manufacturability review, provide target size, thickness, purity or alloy composition, quantity, and the sputtering gun or cathode model if known. If a bonded assembly is required, include backing-plate material, bonding preference, and any dimensional tolerances, surface-finish needs, or inspection-document requirements. TFM can also review customer drawings or old-target samples for replacement builds.
Frequently Asked Questions
Can the composition of a Copper Gallium sputtering target be customized?
Yes. For alloy targets, the required ratio should be specified clearly in wt% or at%. TFM can review custom compositions together with purity, dimensions, and manufacturability.
Will an alloy target always produce a film with the same composition?
Not necessarily. Preferential sputtering, substrate heating, process gas, and re-sputtering effects can shift the deposited composition relative to the nominal target chemistry. Film analysis should be used when the composition is critical.
Is a Copper Gallium alloy target compatible with DC magnetron sputtering?
Many metallic alloy targets are electrically conductive and can be compatible with DC or pulsed-DC sputtering, but the final choice depends on the actual alloy system and equipment.
Why is alloy homogeneity important in a Copper Gallium target?
A uniform alloy distribution helps support stable erosion and reduces local composition variation across the target, which in turn helps improve run-to-run consistency.
Can a Copper Gallium target be supplied bonded?
Yes. Where the cathode or thermal load requires it, TFM can supply bonded assemblies. Backing-plate material, target thickness, bonding method, and operating power should be reviewed together.
What should I include in an RFQ for Copper Gallium?
Specify the alloy composition, purity basis, dimensions, quantity, backing requirement, cathode model or drawing, and any tolerance, inspection, or documentation requirements.
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