In this worksheet, we will practice describing insulators, conductors, and semiconductors and relating their properties to their applications.
Q1:
Glass and quartz are examples of .
- Asemiconductors
- Bconductors
- Csuperconductors
- Dinsulators
Q2:
The LUMO of a semiconductor .
- Aserves as a dopant to the valence band
- Bis often separated from the HOMO by an unsurmountable energy gap
- Cserves to provide electrons to the valence band
- Dhas a limited number of electrons present
Q3:
The doping of silicon with which element would likely form an p-type semiconductor?
- AAntimony
- BPhosphorus
- CCarbon
- DBoron
Q4:
For semiconductors,
- Aan equal number of valence band holes and conductor band electrons exist, making dopants unnecessary.
- Belectron flow is halted due to dopant impurities.
- Cdoping is facilitated by halides.
- Dconduction band electrons outnumber valence band holes.
Q5:
At low temperatures, semiconductors and insulators differ only in .
- Aelectron placement, with electrons occupying the conductance bands of semiconductors but not of insulators
- Bvalence band composition, with semiconductors and insulators having half- and fully filled HOMOs respectively
- Cresistivity, with semiconductors being less conductive than insulators with increasing temperature
- Dband gap size, with insulator band gaps being greater in energy than those of semiconductors
Q6:
Which of the following statements about semiconductors is true?
- ASemiconductors have no energy gap between the valence and conductor bands.
- BIntrinsic superconductors require a dopant to conduct electricity.
- CIntrinsic semiconductors are more efficient than extrinsic semiconductors.
- DSemiconductor conductivity increases with increasing temperature.
Q7:
Raising the temperature of a metal serves to .
- Aslow down the activity of the atom, promoting a gradual increase in conductivity
- Bease electron flow over band gaps
- Callow the metal to behave as a superconductor
- Dimpede conductivity due to increased atom vibration