The typical energy of photons in the visible spectrum is 2 eV, Explain why a semiconductor with

step 1 In a semiconductor, electrons are usually present in balance bands. And then if they receive eno

The typical energy of photons in the visible spectrum is 2...

The typical energy of photons in the visible spectrum is $2 \mathrm{eV}$, Explain why a semiconductor with an energy gap between the valence and conduction
bands of more than 2 eV would
not be suitable in a photovoltaic cell.

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Key Concepts

Photovoltaic Cell Operation

Photovoltaic cells convert light into electrical energy via the absorption of photons which promote electrons to a higher energy state, creating an electrical current. A semiconductor with a band gap larger than the energy of visible photons will not absorb these photons efficiently, thereby reducing the overall efficiency of the cell in converting solar energy to electricity.

Semiconductor Band Gap

The band gap is the energy difference between the discrete energy levels (valence and conduction bands) in a semiconductor. For effective photon absorption and electron excitation, the photon's energy must meet or exceed this gap. If the band gap exceeds the energy of incident photons, electron excitation will not occur, limiting the material's functionality in devices.

Photon Energy

This refers to the energy carried by individual photons of light. In the visible spectrum, photons typically have energies around 2 eV. This energy must be sufficient to excite electrons in a material for energy conversion processes.

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