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Why does an extrinsic semiconductor behave as an intrinsic semiconductor at elevated temperature?
...It is due to the fact that at higher temperatures, the energy in the semiconductor is greater than Eg by a considerable amount, meaning that the conduction band is more full. At these high temperatures, the dopants' role on electron-hole pairs is negligible.
How intrinsic semiconductor can be made into extrinsic semiconductor?
at higher values of temperature the intrinsic carrier concentration become comparable to or greater than doping concentration in extrinsic semiconductors. thus majority and minority carrier concentration increases with increase in temperature and it behaves like intrinsic semiconductor.
Why schottky is called hot carrier diode?
Because the energy of electrons transfer from semiconductor to metal side have more energy than the fermi energy of electrons in metal side. That's why these are called hot carrier diodes
Work function of the semiconductor and metal and the relation which give us ohmic contact and which gives us rectifying contact?
The work function of a semiconductor is the minimum energy required to remove an electron from the Fermi level to the vacuum level, while the work function of a metal is the energy needed to do the same for electrons in the metal. Ohmic contact occurs when the work function of the metal is close to that of the semiconductor, allowing for efficient charge carrier injection and a linear current-voltage relationship. In contrast, rectifying contact is formed when there is a significant difference in work functions, leading to a potential barrier that allows current to flow more easily in one direction than the other, resulting in a diode-like behavior. This difference creates a Schottky barrier, which is essential for rectification.
Why the voltage drop across LED is around 2V instead of 0.7V?
the binary semiconductors used to make LEDs have forward bias voltages from 1.5V to 6V depending on color (1.5V for IR-red to 6V for blue-UV) because the bandgap voltage of the semiconductor is higher than silicon. This higher bandgap is where the photons generated get their energy from. germanium has a lower forward bias voltage of 0.2V because the bandgap voltage is lower. metal-semiconductor contacts, like point contact diodes and schottky barrier diodes, can have forward bias voltages under 0.1V
Do gamma rays have a higher or lower energy level than X-rays?
gamma rays have a way stonger/higher energy level then x rays
What happens when an atom has more electrons than can fit in one energy level?
Answer this question… The extra electrons begin to fill the next energy level.
How do energy differences between higher energy levels of an atom compare to lower energy levels?
They are smaller in magnitude than those between lower energy levels.
Which electrons in oxygen have more energy those in the first level or those in the second?
More energy have the electrons in the second level of energy.
Which electrons in oxygen have more energy those in the first energy level or in the second?
More energy have the electrons in the second level of energy.
Which electron in oxygen have the higher energy those in the first energy level or those in the second?
The second level is associated with higher energy than the first is. Keep increasing the energy of an electron enough, and eventually it breaks free of the atom completely.
What happen when an atom has more electrons that can fit in one energy level?
An atom has multiple energy levels. When an atom has more electrons than it can fit into an energy level, then it puts them into the next higher energy level.
What is the starting energy in the sun is?
The nuclear energy available in the hydrogen. This is a kind of potential energy. Hydrogen has a higher energy level than helium.
What is a degenerate simeconductor Draw an energy band diagram for a degenerate semiconductor?
A degenerate semiconductor is one where the Fermi level lies within the conduction band due to very high doping levels. This results in a high electron concentration, making the material highly conductive. In the energy band diagram for a degenerate semiconductor, the Fermi level rises above the intrinsic energy level into the conduction band, indicating an abundance of electrons.
Why is boron has lower ionization energy than berylium?
Boron has a lower ionization energy than beryllium because boron has an extra electron in a higher energy level orbital, making it easier to remove. This higher energy level allows the electron to be further from the nucleus, experiencing less attraction, resulting in lower ionization energy.
Why does an extrinsic semiconductor behave as an intrinsic semiconductor at elevated temperature?
...It is due to the fact that at higher temperatures, the energy in the semiconductor is greater than Eg by a considerable amount, meaning that the conduction band is more full. At these high temperatures, the dopants' role on electron-hole pairs is negligible.
What is the second principle energy level?
The second principle energy level is designated as the n=2 energy level in an atom. Electrons in this energy level have higher energy than those in the first energy level. The second energy level can hold up to 8 electrons.
