Understanding solar cell band diagram

In summary, the discussion revolved around the physical operation of solar cells based on band diagrams. The conversation touched on the understanding of carrier movements between electrodes and included the mention of articles that can provide further insight into the topic.
  • #1
Hamidreza
1
0
Hi everyone, I have been studying the physics of solar cells for a long time. The only thing that I can not completely understand is the physical operation of solar cell based on band diagram.
Can anyone briefly explain the movements of carriers from one electrode to the another based on band diagram?
IMG_20180311_202159_438.jpg

IMG_20180311_202157_156.jpg
 

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  • #4
Hamidreza said:
Hi everyone, I have been studying the physics of solar cells for a long time. The only thing that I can not completely understand is the physical operation of solar cell based on band diagram.
Can anyone briefly explain the movements of carriers from one electrode to the another based on band diagram?
View attachment 221819
View attachment 221820
The 'cell' you have included with your post is not a single cell, but is in fact a multi-junction solar cell. The InGaP cell up to the tunnel diode acts as one photovoltaic cell, and the GaAs cell after the tunnel diode acts as a second cell.
 

1. What is a solar cell band diagram?

A solar cell band diagram is a graphical representation of the energy levels and the flow of electrons in a solar cell. It shows the energy bands and the location of the valence and conduction bands, as well as the energy levels of impurities and dopants in the material.

2. How does a solar cell band diagram work?

A solar cell band diagram works by using the energy levels of the materials to create a potential barrier that allows electrons to flow from the n-type material to the p-type material. When light (photons) hits the cell, it excites the electrons and they can move freely, generating an electrical current.

3. What is the purpose of a solar cell band diagram?

The purpose of a solar cell band diagram is to understand the flow of electrons and the energy levels within a solar cell. It helps scientists and engineers design and optimize solar cells for maximum efficiency.

4. How does the band gap affect the efficiency of a solar cell?

The band gap is the energy difference between the valence and conduction bands in a material. A larger band gap means that more energy is needed to excite electrons and generate a current, resulting in lower efficiency. A smaller band gap allows for more efficient absorption of light and higher efficiency.

5. Can the band diagram of a solar cell change?

Yes, the band diagram of a solar cell can change depending on external factors such as temperature, light intensity, and material properties. It is important for scientists and engineers to take these factors into account when designing and testing solar cells.

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