Which semiconductor materials prefer silicon germanium or gallium arsenide?

Germanium has a lower bandgap than Silicon. GaAs is a direct bandgap semiconductor unlike Silicon. Still Silicon is preferred over these two, for making solar cells.

Why gallium arsenide GaAs is a preferred material for optoelectronic devices as compared to silicon Si )?

GaAs advantages Some electronic properties of gallium arsenide are superior to those of silicon. It has a higher saturated electron velocity and higher electron mobility, allowing gallium arsenide transistors to function at frequencies in excess of 250 GHz.

What is the main difference between silicon and germanium?

Silicon is a chemical element with atomic number 14 and chemical symbol Si while germanium is a chemical element with atomic number 32 and chemical symbol is Ge. The key difference between silicon and germanium is that Germanium has d electrons, but Silicon does not have any d electrons.

Why silicon and germanium are widely used as semiconductors?

Silicon and germanium are used here effectively because they have 4 valence electrons in their outermost shell, which gives them the ability to gain or lose electrons equally at the same time.

Why silicon and germanium are used as semiconductors?

How do germanium and silicon become semiconductor?

Germanium atoms have one more shell than silicon atoms, but what makes for the interesting semiconductor properties is the fact that both have four electrons in the valence shell. As a consequence, both materials readily constitute themselves as crystal lattices. The process of adding these atoms is known as doping.

Why are silicon and gallium arsenide preferred materials for solar cells?

Solar radiation spectrum has maximum intensity for energy value of approximately 1.5 eV. So , semiconductor with band gap ~1.5 eV or less (e.g. Si) are preferred . GaAs has band gap of ~1.53 eV but has very large absorbing capacity hence they are preferred.

Why are silicon and GaAs are preferred material for solar cells?

Answer: Si and Ga have low threshold electron potential hence they are preferred in solar cell. Answer: SO that they can be activated using solar radiation.

What are the roles of silicon and germanium in a semiconductor?

Both silicon and germanium are semiconductors and contains 4 valence electrons. This means that both of them exhibit properties of metals and non-metals. Silicon is cheaper and can be used at higher temperatures to conduct heat and electricity. On the other hand, germanium also has 4 valence electrons like silicon.

Is gallium arsenide a semiconductor?

Gallium arsenide is a III–V compound direct-gap semiconductor with the Ga and As belonging to the third and fifth column of the periodic table, respectively.

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