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Zinc Sulfide Evaporation Materials

VD0828 Zinc Sulfide Evaporation Materials, ZnS

Catalog No.VD0828
MaterialZinc Sulfide (ZnS)
Purity99.9%~99.999%
ShapePowder/ Granule/ Custom-made

TFM is a top manufacturer and supplier of premium-quality zinc sulfide evaporation materials, along with an extensive range of other evaporation materials. These materials are available in both powder and granule form, with custom shapes and configurations provided upon request to meet specific project requirements.

MSDS File

Introduction

Zinc Sulfide Evaporation Materials (ZnS) are widely used in optical thin film deposition, particularly for infrared (IR) and visible optical coatings. As a II–VI compound semiconductor with high transparency and a relatively high refractive index, ZnS plays a critical role in multilayer interference coatings, IR optics, and protective dielectric layers.

In vacuum deposition systems, ZnS is valued for its stable evaporation behavior and its ability to form dense, uniform films with excellent optical transmission characteristics. High material purity and controlled stoichiometry are essential for maintaining film clarity and minimizing absorption losses.

Detailed Description

Zinc Sulfide (ZnS) is typically supplied in the form of:

  • Irregular pieces

  • Granules

  • Pressed pellets

  • Custom-shaped evaporation charges

High-purity ZnS (commonly 99.9% – 99.99%) is produced through controlled synthesis and purification processes to ensure minimal metallic or oxygen-related impurities. Optical-grade ZnS is particularly important for IR applications, where absorption must be tightly controlled.

Key material properties include:

  • Wide bandgap (~3.6 eV)

  • High refractive index (~2.2–2.4 in visible range)

  • Excellent transmission in visible and infrared regions

  • Chemical stability in dry environments

ZnS evaporation materials are typically used in thermal evaporation or electron beam evaporation systems. Process control—especially substrate temperature and deposition rate—plays a significant role in film density and adhesion performance.

ZnS thin films are often combined with low-index materials (such as fluorides) to form high-performance interference filters and anti-reflective stacks.

Applications

Zinc Sulfide Evaporation Materials are commonly applied in:

  • Infrared optical coatings

  • Multilayer interference filters

  • High-refractive-index dielectric layers

  • Laser optics and protective coatings

  • Night vision and IR imaging systems

  • Display and optoelectronic research

  • Decorative and functional optical films

In IR optics, ZnS films are widely used due to their high transmission across mid-IR wavelengths.

Technical Parameters

ParameterTypical Value / RangeImportance
Chemical FormulaZnSDefines optical and semiconductor properties
Purity99.9% – 99.99%Minimizes absorption and scattering losses
FormPieces / Pellets / GranulesCompatible with various crucibles
SizeCustom (2–20 mm typical pieces)Matches evaporation source capacity
Density (bulk)~4.09 g/cm³Relevant for deposition rate calculations
Deposition MethodThermal / E-beam EvaporationEnsures controlled film growth

Custom sizing and packaging options are available to meet specific vacuum system requirements.

Comparison with Related Optical Materials

MaterialKey AdvantageTypical Application
Zinc Sulfide (ZnS)High refractive index & IR transparencyIR coatings & filters
Zinc Selenide (ZnSe)Broader IR transmissionCO₂ laser optics
Magnesium Fluoride (MgF₂)Low refractive indexAnti-reflective layers
Titanium Dioxide (TiO₂)Very high refractive indexVisible multilayer stacks

Compared to ZnSe, ZnS offers strong mechanical stability and excellent performance in visible-to-mid-IR coatings, making it a versatile optical coating material.

FAQ

QuestionAnswer
Is ZnS suitable for thermal evaporation?Yes, ZnS is commonly used in both thermal and electron beam evaporation systems.
Is optical-grade purity necessary?For IR and precision optical coatings, high purity is strongly recommended.
Can it be used in multilayer stacks?Yes, it is often paired with low-index materials to form interference coatings.
Is ZnS sensitive to moisture?It is relatively stable but should be stored in dry conditions to prevent contamination.
Are customized pellet sizes available?Yes, material size and form can be tailored to your equipment.

Packaging

Our Zinc Sulfide Evaporation Materials are meticulously tagged and labeled externally to ensure efficient identification and maintain high standards of quality control. We take great care to prevent any potential damage during storage and transportation, ensuring the materials arrive in perfect condition.

Conclusion

Zinc Sulfide Evaporation Materials (ZnS) provide a reliable, high-performance solution for optical and infrared thin film deposition. With controlled purity, consistent evaporation characteristics, and flexible customization options, they support both research and industrial optical coating applications.

For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.

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FAQ

  • They are high‐purity substances (e.g. metals, alloys, or compounds) used in thermal or electron‐beam evaporation processes to form thin films on substrates.

  • Typically, they’re processed into a form (often ingots, pellets, or wires) that can be efficiently vaporized. Preparation emphasizes high purity and controlled composition to ensure film quality.

  • Thermal evaporation and electron-beam (e-beam) evaporation are the two main techniques, where material is heated (or bombarded with electrons) until it vaporizes and then condenses on the substrate.

  • Thermal evaporation heats the material directly (often using a resistive heater), while e-beam evaporation uses a focused electron beam to locally heat and vaporize the source material—each method offering different control and energy efficiency.

  • Key parameters include source temperature, vacuum level, deposition rate, substrate temperature, and the distance between the source and the substrate. These factors influence film uniformity, adhesion, and microstructure.

  • Evaporation generally produces high-purity films with excellent control over thickness, and it is especially suitable for materials with relatively low melting points or high vapor pressures.

  • Challenges include issues with step coverage (due to line-of-sight deposition), shadowing effects on complex topographies, and possible re-evaporation of material from the substrate if temperature isn’t properly controlled.

  • Common evaporation materials include noble metals (e.g., gold, silver), semiconductors (e.g., silicon, germanium), metal oxides, and organic compounds—each chosen for its specific optical, electrical, or mechanical properties.

  • Selection depends on desired film properties (conductivity, optical transparency, adhesion), compatibility with the evaporation process, and the final device application (semiconductor, optical coating, etc.).

  • Optimizing substrate temperature, deposition rate, and chamber vacuum are critical for ensuring that the film adheres well and forms the intended microstructure without defects.

  • Troubleshooting may involve checking the source material’s purity, ensuring stable source temperature, verifying the vacuum level, adjusting the substrate’s position or temperature, and monitoring deposition rate fluctuations.

While evaporation tends to yield very high purity films with excellent thickness control, it is limited by its line-of-sight nature. In contrast, sputtering can deposit films more uniformly on complex surfaces and is more versatile for a broader range of materials.

 

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