Product Overview
Cadmium Sulfide Sputtering Target (CdS) is a chalcogenide sputtering target intended for composition-sensitive thin-film deposition. For sulfur-, selenium-, or tellurium-containing materials, the target chemistry is only the starting point: sputtering yield differences, substrate temperature, gas pressure, and volatile-component loss can shift the deposited-film composition relative to the nominal target composition.
Material and Deposition Characteristics
These targets are commonly treated as mechanically brittle and composition-sensitive sputtering materials. RF sputtering is often considered when target conductivity is limited. Power density, substrate temperature, and working pressure should be controlled conservatively, and the deposited film composition should be verified when precise sulfur, selenium, or tellurium stoichiometry is required.
Technical Data
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| Chemical Composition | CdS (Cadmium Sulfide) | Defines bandgap and optical response |
| Purity | 99.99% – 99.999% | Ensures low defect density in films |
| Stoichiometry | Cd:S ≈ 1:1 | Maintains electrical and optical stability |
| Diameter | 25 – 300 mm (custom) | Compatible with standard sputtering cathodes |
| Thickness | 3 – 6 mm (typical) | Influences target lifetime |
| Density | ≥ 95% of theoretical | Supports stable sputtering behavior |
| Bonding | Indium / Elastomer / Direct | Improves heat dissipation and mechanical integrity |
| Material | Key Advantage | Typical Application |
|---|---|---|
| CdS | Ideal bandgap for buffer layers | CdTe & CIGS solar cells |
| ZnS | Cadmium-free alternative | Optical and eco-sensitive devices |
| ZnO | High transparency, conductivity | TCO and window layers |
| CdSe | Narrower bandgap | Photodetectors and optoelectronics |
| Question | Answer |
|---|---|
| Can CdS sputtering targets be customized? | Yes, size, purity, density, and bonding can be tailored. |
| Is RF sputtering required for CdS? | RF sputtering is typically recommended due to CdS’s semiconducting nature. |
| How is cadmium safety handled? | Targets are sealed and handled under strict safety and compliance procedures. |
| How are CdS targets packaged? | Vacuum-sealed with moisture- and contamination-resistant protection. |
Typical Thin-Film Applications
- Chalcogenide thin films for optical, infrared, electronic, thermoelectric, and phase-change research
- Compound semiconductor layers and advanced-material thin-film studies
- Projects where composition retention and controlled sputtering of brittle materials are important
Target Configuration and Ordering Considerations
When requesting a quotation, provide target diameter or rectangular dimensions, thickness, purity or composition, required quantity, and whether a backing plate or bonded assembly is needed. For brittle ceramic or compound targets, it is useful to specify the cathode model, backing-plate material, preferred bonding method, operating power if known, and any density, tolerance, or inspection-document requirements. TFM can review drawings, old-target photos, and application details when custom dimensions are required.
Frequently Asked Questions
What sputtering mode is commonly used for Cadmium Sulfide?
RF magnetron sputtering is often considered when the target conductivity is limited or when more conservative operation is preferred for brittle, composition-sensitive compounds.
Can Cadmium Sulfide films lose sulfur, selenium, or tellurium during deposition?
Yes. Composition drift can occur because of preferential sputtering, substrate heating, re-sputtering, and volatile-component loss. Film composition should be checked when stoichiometry is important.
Why is bonding important for a Cadmium Sulfide target?
Many chalcogenide targets are brittle and have modest thermal conductivity. A suitable backing plate and bonding layer can improve mechanical support and heat transfer during sputtering.
Does the target composition guarantee film stoichiometry for CdS?
No. The target composition is the starting source composition, but the deposited film can still shift because of process variables. Film analysis should be used to confirm the final stoichiometry.
What process variables should be monitored when sputtering Cadmium Sulfide?
Useful variables include power density, working pressure, substrate temperature, cooling, target conditioning, and deposited-film composition. If reactive gas is used, gas ratio should also be controlled carefully.
What should I send TFM for a custom Cadmium Sulfide target?
Please provide composition or formula, purity, dimensions, quantity, backing or bonding details, cathode model, and any film-composition or inspection requirements relevant to your project.
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