Copper(I) selenide
Copper(I) selenide (CAS: 20405-64-5, Formula: Cu2Se, MW: 206.05) is a chalcogenide compound recognised for its thermoelectric properties. It finds applications in materials science and alternative energy research. This compound is supplied by Tech Serve Solutions with a purity of 99.95% on a trace metals basis, suitable for advanced material development and scientific investigation.

Thermoelectric Materials
Copper(I) selenide is investigated for its potential use in thermoelectric devices that convert heat energy into electrical energy. Its properties make it a candidate for solid-state cooling and power generation applications.
Materials Science Research
As a chalcogenide, Cu2Se is utilised in fundamental materials science research to explore novel electronic and optical properties. It serves as a building block for developing new functional materials.
Alternative Energy
This compound is explored within the field of alternative energy due to its semiconducting and thermoelectric characteristics. Research focuses on enhancing its efficiency for energy harvesting technologies.
| Molecular weight | 206.05 |
|---|---|
| Linear formula | Cu2Se |
| Assay | 99.95% trace metals basis |
| Density | 6.84 g/mL at 25 °C(lit.) |



Hazard statements
- H301Toxic if swallowed
- H331Toxic if inhaled
- H373May cause damage to organs through prolonged exposure
- H410Very toxic to aquatic life with long-lasting effects
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P273Avoid release to the environment
- P301IF SWALLOWED
- P311Call a POISON CENTER or doctor
- P501Dispose of contents and container per local regulations
| Protective equipment | Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 3283 6.1 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T,N |
| Risk statements (R) | 23/25-33-50/53 |
| Safety statements (S) | 20/21-28-45-60-61 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Copper(I) selenide used for?
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Copper(I) selenide is primarily used in materials science research, particularly for its thermoelectric properties in the development of alternative energy devices and novel functional materials.
What is the CAS number and chemical formula for Copper(I) selenide?
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The CAS number for Copper(I) selenide is 20405-64-5, and its chemical formula is Cu2Se.
What grade and purity does Tech Serve Solutions supply for Copper(I) selenide?
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Tech Serve Solutions supplies Copper(I) selenide with an assay of 99.95% on a trace metals basis. We do not represent this product as USP, BP, or EP grade.
How should Copper(I) selenide be handled safely?
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Copper(I) selenide is classified as toxic if swallowed or inhaled and may cause damage to organs through prolonged exposure. It is also very toxic to aquatic life with long-lasting effects. Appropriate personal protective equipment, including eyeshields, face shields, gloves, and P2 respirator cartridges, must be worn, and handling should occur in a well-ventilated area. Always consult the Safety Data Sheet (SDS) before use.
Is Copper(I) selenide a controlled substance?
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The provided data does not indicate that Copper(I) selenide is a controlled substance.
How is Copper(I) selenide packed, shipped, and exported?
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Copper(I) selenide is packed and shipped according to relevant safety and transport regulations, including UN 3283, Class 6.1, Packing Group II. Tech Serve Solutions exports globally.
How can I request a quote or sample for Copper(I) selenide?
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To request a quote or sample for Copper(I) selenide, please contact our sales team through the website or by phone.
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