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| 1. |
Which of the following is not a donor atom? |
| Answer» <html><body><p> Aluminium</p><br/><br/><p>Aluminium is an <a href="https://interviewquestions.tuteehub.com/tag/acceptor-846761" style="font-weight:bold;" target="_blank" title="Click to know more about ACCEPTOR">ACCEPTOR</a> atom, an impurity atom in a semiconductor, which can accept or take up one or more electrons from the crystal and become negatively charged.In semiconductor physics. It is a dopant atom that when added to a semiconductor can form a p-type region. For example, when silicon (<a href="https://interviewquestions.tuteehub.com/tag/si-630826" style="font-weight:bold;" target="_blank" title="Click to know more about SI">SI</a>), having four valence electrons, needs to be doped as a p-type semiconductor, elements from group <a href="https://interviewquestions.tuteehub.com/tag/iii-497983" style="font-weight:bold;" target="_blank" title="Click to know more about III">III</a> like boron (B) or aluminium (Al), having three valence electrons, can be used. The latter elements are also called trivalent impurities. Other trivalent dopants include <a href="https://interviewquestions.tuteehub.com/tag/indium-514823" style="font-weight:bold;" target="_blank" title="Click to know more about INDIUM">INDIUM</a> (In) and <a href="https://interviewquestions.tuteehub.com/tag/gallium-470062" style="font-weight:bold;" target="_blank" title="Click to know more about GALLIUM">GALLIUM</a> (Ga).</p></body></html> | |