Understanding solar cell band diagram

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SUMMARY

The discussion focuses on the physical operation of solar cells as explained through band diagrams. Participants seek clarity on the movement of charge carriers between electrodes, specifically in multi-junction solar cells like InGaP and GaAs configurations. Key resources mentioned include Wikipedia's article on the theory of solar cells and a Live Science article that provides a general overview. The distinction between single and multi-junction cells is emphasized, highlighting the complexity of carrier dynamics in these systems.

PREREQUISITES
  • Understanding of semiconductor physics
  • Familiarity with solar cell technology
  • Knowledge of band theory in materials science
  • Basic concepts of charge carrier dynamics
NEXT STEPS
  • Research the operation principles of multi-junction solar cells
  • Study the band diagram analysis for solar cells
  • Explore the role of tunnel diodes in photovoltaic applications
  • Learn about charge carrier recombination and its effects on efficiency
USEFUL FOR

Students and professionals in physics, renewable energy engineers, and anyone interested in the technical workings of solar cell technology.

Hamidreza
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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?
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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.
 

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