Expression of ionizatio energy if si is doped with pentavalent atom
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In a nutshell, when a semiconductor is doped with a pentavalent atom, ...
However, there is no electron to bond with the fourth Si atom.
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When an intrinsic semiconductor is doped with the impurity atoms of valence five like As, P or Sb, some addition energy levels are produced, situation in the energy gap slightly below the conduction band which are called donor energy levels. Due to it, energy gap in semiconductor decreases.
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