At elevated temperature, few of covalent bonds of Si or Ge are broken a vacancy in the bond is created. Effective charge of vacancy or hole isA. positiveB. negativeC. neutralD. sometimes positive and sometimes negative

At elevated temperature, few of covalent bonds of Si or Ge are broken

1.	At elevated temperature, few of covalent bonds of Si or Ge are broken a vacancy in the bond is created. Effective charge of vacancy or hole isA. positiveB. negativeC. neutralD. sometimes positive and sometimes negative
Answer» Correct Answer - A In semiconductor, as the temperature increases, more thermal energy becomes available to electrons and some of these electrons may break-away (becoming free electrons contributing to conduction). The thermal energy effectively ionises only a few atoms in the crystalline lattice and creates a vacancy in the bond. These holes behave as positive charge carriers.

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At elevated temperature, few of covalent bonds of Si or Ge are broken a vacancy in the bond is created. Effective charge of vacancy or hole isA. positiveB. negativeC. neutralD. sometimes positive and sometimes negative

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