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new_986
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why band gap reduces when pressure increased for provskite compounds ?
Nawzad
Nawzad
new_986 said:why band gap reduces when pressure increased for provskite compounds ?
Nawzad
A band gap is the energy difference between the highest occupied energy level (valence band) and the lowest unoccupied energy level (conduction band) in a solid material. It determines the conductivity and optical properties of a material.
As pressure is applied to a perovskite compound, the distance between atoms decreases, causing the energy levels to shift. This can lead to a change in the band gap, either increasing or decreasing it depending on the specific compound and the amount of pressure applied.
The band gap of perovskite compounds is influenced by the chemical composition, crystal structure, and external pressure applied. The size and charge of atoms in the compound, as well as the arrangement of atoms in the crystal lattice, also play a role in determining the band gap under pressure.
The band gap can be measured using various experimental techniques, such as optical spectroscopy or electrical conductivity measurements, while applying pressure to the sample. These methods allow for the determination of how the band gap changes as the pressure increases.
Understanding the relationship between band gap and pressure in perovskite compounds is important for various applications, including photovoltaics, sensors, and optoelectronic devices. This knowledge can also aid in the development of new materials with desired band gap values for specific applications.