Cadmium Selenide (CdSe) Substrates

Cadmium Selenide (CdSe) Substrates for IR Optical Filter Research

Cadmium selenide (CdSe) is a II-VI compound semiconductor used in infrared optics, photodetectors, quantum dots, thin-film solar cells, LEDs, lasers, and optoelectronic research. CdSe substrates are valued for their direct bandgap, strong optical absorption, and useful response in visible and near-infrared applications.

A physicist requested a CdSe substrate for experimental IR optical filter research:

"I'm trying to do something kind of novel with this item. I was going to see how feasible it would be to use this as an IR optical filter. With that being the case, I need the sample to be undoped and polished on both sides. Ideally, I need a 2" diameter crystal, and ultimately I only need one wafer, but in practice I could probably use a couple in case they break."

Reference #212016 for specs and pricing.

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Cadmium Selenide Semiconductor Applications

Cadmium selenide semiconductors are used in optical, electronic, photovoltaic, and biomedical research. CdSe is especially useful when researchers need a material with strong light absorption, tunable optical properties, and compatibility with thin-film or nanocrystal device structures.

Quantum dots: CdSe is widely used as a quantum dot core material because its emission color can be tuned by particle size. Applications include displays, LEDs, bioimaging, lasers, and solar-energy research.
Photovoltaics: CdSe can be used as an absorber layer in thin-film solar cells because of its high absorption coefficient and direct bandgap.
Photodetectors: CdSe is used in light-sensitive devices that convert optical signals into electrical signals, including imaging sensors and infrared detectors.
Light-emitting diodes: CdSe nanocrystals can produce narrow-bandwidth emission for LED and display technologies.
Field-effect transistors: CdSe may be used as an active semiconductor layer in FET research and sensor development.
Lasers: CdSe quantum dots can serve as tunable gain materials for photonic and laser research.
Biomedical research: CdSe quantum dots are studied for bioimaging, biosensing, and targeted detection applications.

What is the Cadmium Selenide Band Gap?

Cadmium selenide is a binary compound semiconductor with a direct bandgap. Bulk CdSe has a bandgap of approximately 1.74 eV at room temperature, which corresponds to the near-infrared region of the electromagnetic spectrum. In CdSe nanoparticles and quantum dots, the bandgap changes with particle size, allowing researchers to tune absorption and emission behavior from near-infrared into the visible range.

This tunable bandgap is one reason CdSe is widely used for quantum dots, solar cells, optoelectronic devices, IR optical filters, LEDs, photodetectors, and semiconductor thin-film research.

Cadmium Selenide (CdSe) Wafer Applications

cadmium selenide CdSe substrate wafer Cadmium selenide (CdSe) substrates are II-VI compound semiconductor materials used in optoelectronics, infrared detection, thin-film solar cells, quantum dots, LEDs, lasers, and semiconductor thin-film research. CdSe is valued for its direct bandgap, strong light absorption, and useful optical properties, making it suitable for devices that convert, detect, or emit light.

Researchers use CdSe wafers and thin films for applications where optical response, semiconductor behavior, and material purity are important. CdSe can be polished, deposited, activated, or processed into thin films depending on the final device design.

CdSe Photoresistors and Photodetectors

CdSe is commonly used in photoresistors and photodetectors because its electrical properties change when exposed to light. This makes cadmium selenide useful for light sensors, imaging devices, infrared detection, optical switches, and other optoelectronic components.

Because CdSe has a high absorption coefficient, it can respond strongly to incoming light, including visible and near-infrared wavelengths. This property makes CdSe substrates useful for research involving IR optical filters, photoconductive devices, and light-sensitive semiconductor structures.

Cadmium Selenide for Thin-Film Solar Cells

CdSe thin films are studied for photovoltaic and solar-cell applications because cadmium selenide can act as an absorber layer in semiconductor devices. Film thickness, deposition method, substrate temperature, annealing conditions, and crystal quality all affect CdSe solar-cell performance.

CdSe may be deposited using methods such as chemical bath deposition, electrodeposition, spray pyrolysis, or other thin-film growth techniques. These methods allow researchers to tune the optical band gap, surface morphology, grain size, and electrical performance of the deposited CdSe layer.

CdSe Quantum Dots

CdSe quantum dots are nanoscale semiconductor particles with size-tunable optical properties. By controlling particle size, researchers can adjust the absorption and emission wavelength of CdSe quantum dots. This makes them valuable for LEDs, lasers, biological imaging, display technologies, photonics, and solar-energy research.

Surface passivation and capping ligands are important in CdSe quantum dot research because they help control stability, emission efficiency, and interaction with surrounding materials.

Cadmium Selenide Semiconductor Thin Films

Cadmium selenide is widely used in semiconductor thin-film research. CdSe films can be deposited on glass, silicon, flexible substrates, and other materials depending on the application. The optical and electrical properties of CdSe films depend on deposition temperature, bath chemistry, film thickness, annealing temperature, and crystal structure.

CdSe thin films may be analyzed using X-ray diffraction (XRD), optical spectroscopy, surface profiling, and electrical measurements to evaluate crystal orientation, grain size, phase formation, band gap, and material quality.

CdSe Optoelectronics and Infrared Research

CdSe substrates are important for optoelectronic devices because they combine semiconductor behavior with strong optical absorption. Applications include IR detectors, optical filters, photoconductors, laser materials, phosphors, LEDs, imaging sensors, and research-grade semiconductor devices.

For infrared and optical-filter research, undoped and double-side polished CdSe substrates may be requested when both surfaces need good optical quality. Thickness, polish, crystal orientation, and surface finish should be selected based on the wavelength range and device structure.

Order Cadmium Selenide (CdSe) Substrates

UniversityWafer, Inc. supplies cadmium selenide substrates for universities, laboratories, and semiconductor researchers. Please provide your required diameter, thickness, polish, orientation, doping preference, and quantity for a custom quote.