How Is the Energy of the Conduction Band Determined in N-Doped Germanium?

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Discussion Overview

The discussion centers on the determination of energy levels in n-doped germanium, specifically the relationship between the conduction band energy (Ec) and the donor level introduced by doping. Participants explore the implications of energy values and calculations related to these energy states.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants state that the donor level is 0.1 eV below the conduction band, suggesting that the relationship can be expressed as Ec = donor level + 0.1 eV.
  • Others question the initial interpretation of the energy levels, noting discrepancies in calculations and references to the Bohr model, indicating that the energy difference may not be straightforward.
  • A participant highlights the need to understand where the initial state is located when considering the energy required to free an electron from its atom to the conduction band.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the interpretation of the energy levels and calculations related to the donor level and conduction band. Multiple competing views and uncertainties remain regarding the correct understanding of these concepts.

Contextual Notes

Limitations include potential misunderstandings of energy level definitions and the implications of using different models for calculations. The discussion reflects varying interpretations of the energy states involved.

abdo799
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I am studying introduction to solid state physics and it's stated that when germanium is n doped energy states with energy -0.1 ev are introduced, then it's stated that this means that the donor level is 0.1 ev below the Conduction level
Does that mean that the Ec is considered 0??
 
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the donor level is 0.1 ev below the Conduction level ...
...means that whatever Ec is, the donor level is Ec-0.1eV.
 
Simon Bridge said:
...means that whatever Ec is, the donor level is Ec-0.1eV.
i thought so in the first, but when i revised his calculation ( and checked another text) this energy is not a difference, when he was trying to calculate an approximate he used the bohr model. FIRST he said it was -0.1ev then he said thus it's -0.1 ev below it.
i can screenshot it for you if you would understand more if u saw the text.
 
He calculates how much energy (minimum value) is needed to free the electron from its atom. This means to "move" it into the conduction band. If you need 0.1 eV to promote it into the conduction band, where would you locate the initial state?
 

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