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Why do we mostly use indirect semiconductors?
The indirect band gap semiconductors like silicon and germanium are mostly used because they are elemental, plentiful, and easier to process than the direct band gap semiconductors which are alloys or compounds.
Titanium dioxide is direct band gap or indirect band gap material?
Yes it is. Most Sn (tin) materials as semiconductors are direct band gap materials. Silicon on the other hand is an indirect band gap material.
Do semiconductor material have a very high resistance at room temperature?
No. As temperature increases, resistance of semiconductors decrease. This is because semiconductors have a small energy gap between their valence band and conduction band (in the order of 1 eV). Electrons must exist in the conduction band in order for the material to conduct but electrons exist in the valence band naturally. The electrons gain thermal energy for surroundings and jumps the energy gap from valence band to conduction band and hence, the SC material more readily conducts. As temperature increases, electrons can gain more thermal energy, more electrons can enter the conduction band and hence, resistance decreases.
What different between band gap silicon amorphous with crystaline?
Amorphous Silicon (a-Si) has band gap of about 1.7eV, whereas crystalline (c-Si) only has a band gap of 1.1eV
What are applications of direct and indirect band gap?
direct band gap means in e-k diagram valance bands are exactly below covalance band,in this band electron falls from the conduction band to valance band directly without going to metastable state and in indirect band gap the band electron falls from the conduction band to valance band by first going through the metastable state
Why do we mostly use indirect semiconductors?
The indirect band gap semiconductors like silicon and germanium are mostly used because they are elemental, plentiful, and easier to process than the direct band gap semiconductors which are alloys or compounds.
What are the Characteristics of Direct and indirect band gap semiconductors?
Direct band semconductors are mostly for LEDs. Indirect band semiconductors like Si and Ge are conventional diodes.
What is band gap of electrolyte (Na2SO4)?
The band gap of an electrolyte like Na2SO4 is not well-defined as it consists of ionic compounds which do not have a band structure like semiconductors. Band gap is a property of materials with covalent bonding, like semiconductors, where it represents the energy difference between the valence and conduction bands.
What is the significance of the optical band gap in the study of semiconductors?
The optical band gap is important in the study of semiconductors because it determines the energy required for electrons to move from the valence band to the conduction band, allowing them to conduct electricity. This gap influences the semiconductor's ability to absorb and emit light, which is crucial for various electronic applications such as solar cells and LEDs.
Titanium dioxide is direct band gap or indirect band gap material?
Yes it is. Most Sn (tin) materials as semiconductors are direct band gap materials. Silicon on the other hand is an indirect band gap material.
What has the author R Dornhaus written?
R. Dornhaus has written: 'Narrow-gap semiconductors' -- subject(s): Narrow gap semiconductors
Why does a semiconductor have fewer free electron than a conductor?
Valence electrons only are able to cross the energy gap in semiconductors since it is greater than that of conductors. That is why semiconductors have fewer free electrons than conductors.
What is the value of band gap of zinc selenide?
The band gap of zinc selenide is approximately 2.7 electron volts (eV). This value indicates the energy difference between the valence band and the conduction band in the material. Zinc selenide is a semiconductor commonly used in optoelectronic applications due to its wide band gap.
Why in intrinsic semiconductors do you need to apply very high potential to transfer electrons from the valence band to the conduction band?
Semiconductors, in the absence of applied electric fields, act a lot like insulators. In these materials, the conduction band and the valence band do not overlap. That's why they insulate. And that's why you have to apply some serious voltage to them to shove the valence electrons across the gap between the valence and conduction bands of these semiconductor materials. Remember that in insulators, there is a "band gap" between the lowest Fermi energy level necessary to support conduction and the highest Fermi energy level of the valence electrons. Same with the semi's. In metals, the conduction band overlaps the valence band Fermi energy levels. Zap! Conductivity.
What are the differences between degenerate and non-degenerate semiconductors?
Degenerate semiconductors have a high concentration of charge carriers due to doping, while non-degenerate semiconductors have a low concentration. Degenerate semiconductors exhibit metallic-like conductivity and Fermi level is inside the conduction or valence band, while non-degenerate semiconductors have a well-defined band gap and behave as insulators at low temperatures.
What is the value of band gap for thermistor?
NTC thermistors are metal oxide which has energap gap of the oder 0.5eV
What is transparent electronics?
The term transparent electronics refers to devices that has wide band gap semiconductors. The devices also contain active oxides in active components.
