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sudeshiitr
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why the mobility of electrons more than holes despite the fact that electrons have larger effective mass than holes.
Please pay attention to the dates of the posts, your last post was in a 6 year old thread, this one is 4 years old.johnsims said:did anyone ever answer this question about the http://www.3gcgroup.com/" [Broken] of the electrons?
Electrons are more mobile than holes because they have a negative charge, which allows them to move more freely in an electric field. This is due to the fact that they are repelled by the negative charge and attracted to the positive charge, causing them to move towards the positive electrode with greater ease.
The band structure of a material plays a crucial role in determining the mobility of electrons. In materials with a wider bandgap, there is a larger energy barrier between the valence and conduction bands, making it more difficult for electrons to move. On the other hand, materials with a narrower bandgap have a smaller energy barrier, allowing electrons to move more easily.
Impurities can significantly affect electron mobility in a material. When impurities are added to a material, they can create defects in the crystal lattice, which can act as scattering centers for electrons. This can hinder their movement and decrease their mobility.
Temperature has a direct impact on the mobility of electrons. As the temperature increases, the atoms in the crystal lattice vibrate more vigorously, creating more scattering centers for electrons. This results in a decrease in electron mobility. Additionally, at higher temperatures, some electrons may gain enough thermal energy to break free from the crystal lattice, further reducing electron mobility.
Yes, electron mobility can be improved in materials through various methods. One approach is to reduce the number of impurities in the material, which will decrease the number of scattering centers for electrons. Additionally, by carefully engineering the band structure of a material, it is possible to create a material with a larger bandgap, allowing for higher electron mobility.