Discussion Overview
The discussion revolves around the concept of holes in semiconductors, particularly their presence during the photoelectric effect, their characteristics, and their effective mass. Participants explore the behavior of holes in different materials, including metals and semiconductors, and the implications for electric and magnetic fields.
Discussion Character
- Exploratory
- Technical explanation
- Conceptual clarification
- Debate/contested
Main Points Raised
- Some participants question whether holes are present in metals during the photoelectric effect, suggesting that holes are typically associated with the valence band in semiconductors.
- One participant explains that holes are effectively positively charged vacancies in the valence band and can carry current, while noting that in metals, the vacancy left by a conduction electron does not behave as a localized hole.
- There is a discussion about the effective mass of holes, with one participant stating that it varies by material and providing an example of silicon having a heavy hole effective mass.
- Participants express uncertainty about the characteristics of holes compared to electrons, particularly regarding their behavior in electric and magnetic fields, noting that holes flow in the opposite direction to electrons.
- Clarifications are sought regarding the term "mobile yet localized," with participants discussing the meaning of localization in the context of electrons and holes.
Areas of Agreement / Disagreement
Participants do not reach a consensus on the presence of holes in metals during the photoelectric effect, and there are differing views on the characteristics and effective mass of holes compared to electrons.
Contextual Notes
The discussion includes varying definitions and interpretations of terms like "mobile" and "localized," and the effective mass of holes is noted to depend on the specific material properties, which are not fully resolved.