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Question
Explain the following with suitable examples:
12-16 group compounds
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Solution
- The 12-16 group compounds are semiconducting materials formed by combining elements from Group 12 (II) of the periodic table (like Zn, Cd) with elements from Group 16 (VI) (like S, Se, Te). These compounds are often called II-VI semiconductors.
- Examples of group 12-16 compounds include zinc sulphide (ZnS), cadmium sulphide (CdS), cadmium selenide (CdSe), and mercury (II) telluride (HgTe).
- These compounds are ideal for optoelectronic applications such as light emission and detection.
- These compounds, with their direct band gaps, excel in both light-emitting and light-absorbing applications.
- These compounds discover their application in LEDs, laser diodes, solar cells, and photodetectors.
RELATED QUESTIONS
A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. To which group should this impurity belong?
Non-stoichiometric cuprous oxide, Cu2O can be prepared in laboratory. In this oxide, copper to oxygen ratio is slightly less than 2 : 1. Can you account for the fact that this substance is a p-type semiconductor?
Classify each of the following as being either a p-type or a n-type semiconductor:
- Ge doped with In
- B doped with Si
What type of semiconductor is obtained when
Ge is doped with In?
What type of semiconductor is obtained when
Si is doped with P?
Solids with conductivities ranging from 104 to 107 ohm-1 m-1 are ____________.
Semiconductors have conductivity (in ohm-1 m-1) in the range of ____________.
Electrical conductivity of semiconductors increases with increase in ____________.
Silicon doped with electron-rich impurity forms ______.
Which of the following statements are true about semiconductors?
(i) Silicon doped with electron-rich impurity is a p-type semiconductor.
(ii) Silicon doped with an electron-rich impurity is an n-type semiconductor.
(iii) Delocalised electrons increase the conductivity of doped silicon.
(iv) An electron vacancy increases the conductivity of n-type semiconductor.
Why does the electrical conductivity of semiconductors increase with rise in temperature?
Assertion: Semiconductors are solids with conductivities in the intermediate range from 10–6 – 104 ohm–1m–1.
Reason: Intermediate conductivity in semiconductor is due to partially filled valence band.
Silicon is a/an ______
