Interpretation:
The semiconductor band gap energy determines the color of an LED. Knowing the energies of photons of different colors of light, which semiconductor would have the larger band gap: the one in a green exit sign’s LEDs, or the one in a red traffic signal has to be explained
Concept Introduction:
Semiconductors are substances that conduct electricity either by addition of an impurity or by the effects of temperature on it. Semiconductors electrical conductivity lies between conductor and insulator. Semiconductors have small energy gap between valence band and conduction band.
Addition of impurity to a semiconductor is termed as doping. Doping alters the conductivity of a semiconductor. The addition of an element having either more or less number of valence electrons than the natural semiconductor decides the combination as the following two types of semiconductor.
- n- type semiconductor
- p-type semiconductor
The combination of these two semiconductors finds application in solar cell and in diodes
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Chemistry: Atoms First
- a) Explain the band structure of an electrical conductor (metal), a semiconductor, and an insulator at 0 K by showing the valence and conduction bands and fermi energy levels. Explain how the electrical conduction takes place in these three types of materials. Give an example for each type of material. b)Explain what n and p-type semiconductors are using their band structures. Why?arrow_forwardUse molecular orbital band diagrams to explain why metals are good conductors but semiconductors are not.arrow_forwardWhat are the main differences between Diamagnetic and Paramagnetic materials?arrow_forward
- 2. What is the coordination number structure formed by most semiconductors and electronic materials (GaAs, Cds)arrow_forwardProvide examples of metals with FCC structure and explain briefly why are they categorized as having FCC structure.arrow_forwardWhat is the underlying mechanism that causes superconductivity in certain materials? How can we mitigate the environmental impact of the chemical industry? What is the relationship between molecular structure and the optical properties of materialsarrow_forward
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