Semiconductor Principles Questions

• How many valence electrons are in every semiconductor material?
• Elements with 1, 2, or 3 valence electrons usually make excellent:
• When and who discovered that more than one transistor could be constructed on a single piece of semiconductor material:
• Solid state devices were first manufactured during:
• What causes the depletion region?
• Electron pair bonding occurs when atoms:
• What is the most significant development in electronics since World War II?
• The natural elements carbon, germanium, and silicon are semiconductors.
• The first integrated circuit was invented in 1959.
• When a voltage is placed across a semiconductor, free electrons move toward the negative voltage.
• When a depletion region of a transistor is large the barrier voltage is also large.
• The number of electrons in the outer shell of carbon, germanium, and silicon is 5.
• The first transistor was invented in 1938.
• A covalent bond is when atoms lose valence shell electrons.
• Germanium is the most widely used semiconductor material because of its stability at high temperatures.
• The n-type semiconductor material is doped by adding material with electron holes.
• The P-N junction is a barrier to electron flow.
• The forward voltage drop for a germanium transistor is 0.7 V and for a silicon transistor is 0.3 V.