Cadmium arsenide
Encyclopedia
Cadmium arsenide is a crystal
line semiconductor
with a tetragonal structure in the II-V family. It is a narrow gap semiconductor
with an energy gap
of 0.14 eV
. The electron mobility
is very large at ambient temperature. It is a n-type
intrinsic semiconductor
.
Cadmium arsenide can be prepared as amorphous semiconductive glass
.
Cadmium arsenide shows the Nernst effect
.
Cadmium arsenide is used in infrared detector
s using Nernst effect, and in thin-film dynamic pressure sensor
s. It can be also used to make magnetoresistors
, and in photodetector
s. http://intl.ieeexplore.ieee.org/xpl/abs_free.jsp?arNumber=781173
Cadmium arsenide can be used as a dopant
for HgCdTe.
Crystal
A crystal or crystalline solid is a solid material whose constituent atoms, molecules, or ions are arranged in an orderly repeating pattern extending in all three spatial dimensions. The scientific study of crystals and crystal formation is known as crystallography...
line semiconductor
Semiconductor
A semiconductor is a material with electrical conductivity due to electron flow intermediate in magnitude between that of a conductor and an insulator. This means a conductivity roughly in the range of 103 to 10−8 siemens per centimeter...
with a tetragonal structure in the II-V family. It is a narrow gap semiconductor
Narrow gap semiconductor
Narrow gap semiconductors are semiconducting materials with a band gap that is comparatively small compared to silicon. They are used as infrared detectors or thermoelectrics.-List of Narrow gap semiconductors:*HgCdTe*PbSe*PbS*PbTe*InAs*InSb*Cd3As2...
with an energy gap
Band gap
In solid state physics, a band gap, also called an energy gap or bandgap, is an energy range in a solid where no electron states can exist. In graphs of the electronic band structure of solids, the band gap generally refers to the energy difference between the top of the valence band and the...
of 0.14 eV
Electronvolt
In physics, the electron volt is a unit of energy equal to approximately joule . By definition, it is equal to the amount of kinetic energy gained by a single unbound electron when it accelerates through an electric potential difference of one volt...
. The electron mobility
Electron mobility
In solid-state physics, the electron mobility characterizes how quickly an electron can move through a metal or semiconductor, when pulled by an electric field. In semiconductors, there is an analogous quantity for holes, called hole mobility...
is very large at ambient temperature. It is a n-type
N-type semiconductor
N-type semiconductors are a type of extrinsic semiconductor where the dopant atoms are capable of providing extra conduction electrons to the host material . This creates an excess of negative electron charge carriers....
intrinsic semiconductor
Intrinsic semiconductor
An intrinsic semiconductor, also called an undoped semiconductor or i-type semiconductor, is a pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities...
.
Cadmium arsenide can be prepared as amorphous semiconductive glass
Glass
Glass is an amorphous solid material. Glasses are typically brittle and optically transparent.The most familiar type of glass, used for centuries in windows and drinking vessels, is soda-lime glass, composed of about 75% silica plus Na2O, CaO, and several minor additives...
.
Cadmium arsenide shows the Nernst effect
Nernst effect
In physics and chemistry, the Nernst Effect is a thermoelectric phenomenon observed when a sample allowing electrical conduction is subjected to a magnetic field and a temperature gradient normal...
.
Cadmium arsenide is used in infrared detector
Infrared detector
An infrared detector is a photodetector that reacts to infrared radiation. The two main types of detectors are thermal and photonic.The thermal effects of the incident IR radiation can be followed through many temperature dependent phenomena....
s using Nernst effect, and in thin-film dynamic pressure sensor
Pressure sensor
A pressure sensor measures pressure, typically of gases or liquids. Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area. A pressure sensor usually acts as a transducer; it generates a signal as a function of the...
s. It can be also used to make magnetoresistors
Magnetoresistance
Magnetoresistance is the property of a material to change the value of its electrical resistance when an external magnetic field is applied to it. The effect was first discovered by William Thomson in 1856, but he was unable to lower the electrical resistance of anything by more than 5%. This...
, and in photodetector
Photodetector
Photosensors or photodetectors are sensors of light or other electromagnetic energy. There are several varieties:*Active pixel sensors are image sensors consisting of an integrated circuit that contains an array of pixel sensors, each pixel containing a both a light sensor and an active amplifier...
s. http://intl.ieeexplore.ieee.org/xpl/abs_free.jsp?arNumber=781173
Cadmium arsenide can be used as a dopant
Dopant
A dopant, also called a doping agent, is a trace impurity element that is inserted into a substance in order to alter the electrical properties or the optical properties of the substance. In the case of crystalline substances, the atoms of the dopant very commonly take the place of elements that...
for HgCdTe.