How Does the Mass of a Hole Exceed That of an Electron in Semiconductors?

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Discussion Overview

The discussion revolves around the concept of holes in semiconductors, specifically addressing why the mass of a hole can exceed that of an electron. Participants explore the significance of holes, the effective mass concept, and the implications for current propagation in semiconductor materials.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants inquire about the definition and significance of a hole in semiconductors and the mass energy required for its propagation.
  • One participant emphasizes the concept of effective mass, noting that both holes and electrons in semiconductors have different effective masses compared to their free counterparts due to their nature as quasi-particles.
  • Another participant explains that the effective mass is influenced by interactions with the lattice and other electrons, which can increase inertia and thus the apparent mass of the quasi-particle.
  • There is a request for simpler explanations that do not require extensive knowledge of quantum physics.
  • A participant expresses confusion regarding the explanation of effective mass and seeks clarification on whether increasing inertia affects the effective mass of holes, electrons, or both.
  • One participant raises a concern about gender-neutral language in discussions, highlighting the importance of inclusivity in the community.

Areas of Agreement / Disagreement

Participants generally agree on the complexity of the topic and the need for clarification on effective mass, but there is no consensus on the specifics of how effective mass is defined or its implications for holes and electrons.

Contextual Notes

Participants express varying levels of understanding regarding effective mass and band dispersion, indicating that some foundational concepts may be missing or unclear in the discussion.

tworitdash
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How can the mass of a hole is larger than an electron?I want to know what a hole signifies and the mass energy required for it to propagate in the semiconductors for constituting current.
 
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tworitdash said:
How can the mass of a hole is larger than an electron?I want to know what a hole signifies and the mass energy required for it to propagate in the semiconductors for constituting current.

Back up a bit. Do you know how an effective mass in define in terms of the band dispersion? You have not provided enough information on what you DO know.

Zz.
 
no.I haven't got any idea about effective mass.I know that a hole is just the empty space created by an electron.and I have a little idea about band dispersion.
 
sir,please help me out with some simple lines that i can understand without knowing much of quantum physics.
 
The point is that not only a hole has an (effective) mass different from that of an electron but that also the effective mass of an electron in a semiconductor is different from the mass of a free electron. The reason is that an electron or a hole in a semi-conductor is a quasi-particle. I.e. it is a compound object consisting of an electron (or hole) that carries deformations of the lattice with him and also interacts with the "sea" of other electrons. These deformation etc. increase inertia and hence the apparent or "effective" mass of that quasi-particle.
Another contribution to the mass comes from increasing reflection from lattice planes in the crystal near the zone boundaries.
 
Thank you sir,but i didn't get the last line.would you mind explaining me once more?and the increasing inertia increases the effective mass of only hole or only electron or both?
 
tworitdash said:
Thank you sir,but i didn't get the last line.would you mind explaining me once more?and the increasing inertia increases the effective mass of only hole or only electron or both?

Before we go any further, you may want to make your replies to be gender neutral. We have many women physicists and professionals in here. Your replies assume that we are all males, which is faulty!

Zz.
 
sorry ... I will take it into consideration from now.
 

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