indiumfosfide

Indium phosphide (InP) is a binary III–V semiconductor composed of indium and phosphorus. It is widely used in infrared optoelectronics and high-speed electronics. InP crystallizes in the zinc blende structure and has a room-temperature lattice constant of about 5.869 Å.

The material features a direct bandgap at the Γ point, with a room-temperature bandgap of approximately 1.34–1.35 eV. This enables efficient light emission near 1.3–1.6 μm, covering key telecommunications wavelengths. Doping is common to tailor conductivity: n-type dopants include silicon, sulfur, or tellurium, while p-type dopants include zinc or cadmium.

Growth and preparation are dominated by epitaxial techniques. High-quality InP layers and devices are grown by chemical vapor deposition (MOCVD) or molecular beam epitaxy (MBE); bulk or large-area layers can also be produced by liquid-phase epitaxy. The material is processed into wafers, epitaxial films, and nanostructures such as nanowires. It is frequently used in combination with ternary and quaternary alloys (e.g., InGaAs) to adjust bandgaps and lattice matching for specific device designs.

Applications include lasers, photodetectors, modulators, and other optoelectronic components operating around the 1.3 and 1.55 μm telecom windows, as well as high-speed transistors and integrated photonics. InP-based materials offer high electron mobility and favorable optical properties, making them a core platform for infrared and telecommunications technologies.

Physical properties commonly cited include high electron mobility (around 5400 cm2/Vs at room temperature), moderate hole mobility, and a thermal conductivity near 68 W/m·K. The refractive index in the infrared is high, approximately 3.1. The material forms a native oxide and can be sensitive to oxidation, requiring surface passivation in devices.

Safety and handling follow standard semiconductor practices; appropriate precautions are advised when working with InP powders and reactive precursors.