Difference between revisions of "Forest SolidState Detectors"
| (6 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
Solid state detectors are basically materials in which a radiation sensitive region of mobile carriers is established with a voltage. A gas chamber in solid form. | Solid state detectors are basically materials in which a radiation sensitive region of mobile carriers is established with a voltage. A gas chamber in solid form. | ||
| + | |||
| + | |||
| + | =What is a semi-conductor= | ||
| + | |||
| + | ;Valence band | ||
| + | :electrons tightly bound to the crystal's atoms occupy this energy band | ||
| + | |||
| + | ; Conduction band | ||
| + | : electrons detached from the parent atom occupy this energy band and are free to roam about the crystal | ||
| + | |||
| + | ;Energy gap | ||
| + | : the Energy gap is the represents the amount of energy needed for an electron to move from the valence band to the conduction band | ||
| + | |||
| + | [[Image:Forest_SemiConductorEnergyGap.gif]] | ||
| + | |||
| + | |||
| + | |||
| + | |||
| + | == Conductors== | ||
| + | |||
| + | In a conductor, there is no band gap. The valence and conduction bands overlap. Electrons are free to move according to the applied voltage. | ||
| + | |||
| + | == Insulators== | ||
| + | |||
| + | Insulators have energy gaps of about 6 eV at room temperature.. All of the electrons are in the Valence band. If you heat up the insulator though you could start to get a leakage current with a high enough voltage. | ||
| + | |||
| + | == Semi-Conductors== | ||
| + | |||
| + | The energy gap in a semi-conductor is about 1 eV at room temperature. This gap is so small that valence electrons could enter the conductive band due to their thermal excitation. | ||
| + | |||
| + | |||
| + | |||
| + | |||
| + | The energy gap is about 1 eV for a semi-conductor and about 6 eV for an Insulator. In a Conductor, there is no energy gap. The Valence and Conduction bands overlap. | ||
Silcon is the most commonly used material for such detectors. Germanium, Gallium-Arsenide, and diamond are also used. | Silcon is the most commonly used material for such detectors. Germanium, Gallium-Arsenide, and diamond are also used. | ||
A min ionizing particle liberates about 300 fC (22000 electrons) in a 300 <math>\mu</math> m thick piece of silicon. | A min ionizing particle liberates about 300 fC (22000 electrons) in a 300 <math>\mu</math> m thick piece of silicon. | ||
| + | |||
| + | = Silicon Detectors= | ||
| + | |||
| + | [http://arxiv.org/abs/0908.4202 Radiation Tolerance of CMOS Monolithic Active Pixel Sensors with Self-Biased Pixels] | ||
[http://www.iac.isu.edu/mediawiki/index.php/Forest_Detectors Go Back] | [http://www.iac.isu.edu/mediawiki/index.php/Forest_Detectors Go Back] | ||
Latest revision as of 14:57, 31 August 2009
Solid state detectors are basically materials in which a radiation sensitive region of mobile carriers is established with a voltage. A gas chamber in solid form.
What is a semi-conductor
- Valence band
- electrons tightly bound to the crystal's atoms occupy this energy band
- Conduction band
- electrons detached from the parent atom occupy this energy band and are free to roam about the crystal
- Energy gap
- the Energy gap is the represents the amount of energy needed for an electron to move from the valence band to the conduction band
Conductors
In a conductor, there is no band gap. The valence and conduction bands overlap. Electrons are free to move according to the applied voltage.
Insulators
Insulators have energy gaps of about 6 eV at room temperature.. All of the electrons are in the Valence band. If you heat up the insulator though you could start to get a leakage current with a high enough voltage.
Semi-Conductors
The energy gap in a semi-conductor is about 1 eV at room temperature. This gap is so small that valence electrons could enter the conductive band due to their thermal excitation.
The energy gap is about 1 eV for a semi-conductor and about 6 eV for an Insulator. In a Conductor, there is no energy gap. The Valence and Conduction bands overlap.
Silcon is the most commonly used material for such detectors. Germanium, Gallium-Arsenide, and diamond are also used.
A min ionizing particle liberates about 300 fC (22000 electrons) in a 300 m thick piece of silicon.
Silicon Detectors
Radiation Tolerance of CMOS Monolithic Active Pixel Sensors with Self-Biased Pixels