Lead Iodide (PbI2) Semiconductors

Description

Lead iodide, also known as plumbous iodide, is a very rarely used compound semiconductor, which appears bright yellow at room temperature. Due to the high atomic numbers of its elements, it has a high photoelectric efficiency of gamma photons while its 2.5eV bandgap promises performance at temperatures up to 250°C. It is promising as a high-efficiency solid state detector; however early devices were limited by material imperfections and impurities. As new crystal growth and purification techniques are being developed, the material has improved mechanical, crystallographic and optical properties. It is soluble in boiling water and potassium iodide.

Applications

The applications of lead iodide are in printing, bronzing, mosaic gold and photography. It is also used as a detector for high-energy photons such as X- rays and gamma rays.

Chemical Properties

The chemical properties of lead iodide are:

Chemical Properties
Chemical Formula PbI2
Molecular Weight 461.01
CAS No. 10101-63-0
IUPAC Name Lead Iodide
Group Lead –14
Iodine – 17
Crystal Structure Rhombohedral, hP3
Symmetry Group P-3m1

Electrical Properties

The electrical properties of lead iodide are:

Electrical Properties
Band Gap 2.5 eV
Electron Mobility ≤ 8 cm2 V-1 s-1
Hole Mobility ≤ 2 cm2 s-1

Thermal and Mechanical Properties

The thermal and mechanical properties of lead iodide are:

Mechanical Properties
Melting Point 402 °C
Density 6.16 g cm-3
Thermal Properties
Thermal Diffusivity (25.0±0.4)×10-3cm2 s-1
Thermal conductivity 26.864.3 10-3 W cm-1 K

Safety Information

Safety Information
GHS Hazard Statements R 61 – May cause harm to the unborn child
R 62 – Possible risk of impaired fertility
R 20/22 – Harmful by inhalation and if swallowed
R 33 – Danger of cumulative effects
Safety Precautions S53 – Avoid exposure – obtain special instructions before use
S45 – In case of accidents or if you feel unwell seek medical device immediately

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