Cadmium selenide
Cadmium Selenide
Cadmium selenide (CdSe) is a chemical compound that is a member of the II-VI semiconductor group. It is composed of cadmium and selenium and is known for its applications in optoelectronics, including solar cells, light-emitting diodes (LEDs), and quantum dots.
Properties
Cadmium selenide is a solid material that can exist in several crystalline forms, including the hexagonal wurtzite and the cubic zinc blende structures. It is a direct bandgap semiconductor with a bandgap energy of approximately 1.74 eV at room temperature, which makes it suitable for use in visible light applications.
Physical Properties
- Molecular Formula: CdSe
- Molar Mass: 191.38 g/mol
- Density: 5.81 g/cm³
- Melting Point: 1,240 °C
Chemical Properties
Cadmium selenide is relatively stable in air but can oxidize at elevated temperatures. It is insoluble in water but can react with acids to form hydrogen selenide gas, which is toxic.
Applications
Cadmium selenide is widely used in the field of optoelectronics due to its semiconducting properties. Some of its notable applications include:
- Quantum Dots: CdSe quantum dots are used in displays and bio-imaging due to their size-tunable optical properties.
- Photovoltaics: CdSe is used in thin-film solar cells as an absorber layer.
- LEDs: It is used in the production of light-emitting diodes for its efficient light emission.
Health and Safety
Cadmium selenide is considered hazardous due to the toxicity of cadmium and selenium compounds. Exposure can occur through inhalation, ingestion, or skin contact, and it can cause serious health effects, including kidney damage and respiratory issues. Proper handling and disposal procedures must be followed to minimize risks.
Environmental Impact
The use of cadmium selenide in electronic devices raises concerns about environmental contamination, particularly during disposal. Recycling and proper waste management are essential to mitigate its environmental impact.
Also see
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