James Beletic's presentation
James Beletic's presentation
James Beletic's presentation
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Crystals are excellent detectors of light<br />
• Simple model of atom<br />
– Protons (+) and neutrons in the nucleus<br />
with electrons orbiting<br />
Silicon crystal lattice<br />
• Electrons are trapped in the crystal lattice<br />
– by electric field of protons<br />
• Light energy can free an electron from the<br />
grip of the protons, allowing the electron to<br />
roam about the crystal<br />
– creates an “electron-hole” pair.<br />
• The photocharge can be collected and<br />
amplified, so that light is detected<br />
• The light energy required to free an electron<br />
depends on the material.
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