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23.0Solid-State Electronics

Overview: Solid-State Electronics: Conduction in Solids and Electronic Devices — American System Physics Revision Notes & Topical Questions

5 min read 6 parts Lesson 2 of 5 Unit quiz

📚 American System Physics Hub / Topical Revision
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Lesson summary

Explain conduction with band theory.Semiconductor conductivity increases with temperature (opposite to metals).Holes act like positive charge carriers.Solar cells are p–n junctions that convert light to electricity.Transistors have three layers (npn or pnp).Modern processors cont…

  • Integrated circuit
  • Identify / Describe (FRQ)
  • Explain / Justify (FRQ)
  • MCQ technique
  • Keywords the mark scheme looks for in this lesson
  • How to get full marks (examiner guidance)

Section 1 of 6Overview: Solid-State Electronics: Conduction in Solids and Electronic Devices

1
23.1 Solid-State Electronics: Conduction… concept map: Band theory, Band gap, Semiconductor, Doping, n-type
Visual guide to the key ideas explained in this lesson.
2
Rectifiers convert AC to DC.
3
Zener diodes regulate voltage.
4
LED colour depends on the band gap.
5
Photodiodes detect light.
6
Silicon is the most common semiconductor.

Section 2 of 6Process & sequence

1
Identify the material's band gap.
2
Consider temperature or doping effects.
3
For a p–n junction, determine bias direction.
4
Forward bias narrows the depletion layer and current flows.
5
Use diodes for rectification (AC to DC).

p–n junction diodewrite these steps in this order; each step is a marking point.

1
p and n joined
2
Depletion layer forms
3
Forward bias
4
Current flows
5
Reverse bias blocks

Section 3 of 6Compare

Conductors, semiconductors, insulators
TypeBand gapConductivity
ConductorOverlapping bandsHigh
SemiconductorSmall (~1 eV)Medium, rises with temperature
InsulatorLarge (>5 eV)Very low
Diode bias
BiasConnectionCurrent
Forwardp to +, n to −Flows
Reversep to −, n to +Almost none

Section 4 of 6Key terms

Section 5 of 6Command terms

Command terms
Identify / Describe (FRQ)
A short, specific statement; describing requires relevant characteristics, not a single word.
Explain / Justify (FRQ)
Give the cause-and-effect reasoning or evidence; a restated fact does not score.
Calculate
Show setup, substitution and the answer with units.
Predict
State the expected outcome; add a reason only if asked to justify.
MCQ technique
Read every option; eliminate distractors that are true statements but do not answer the question; watch for NOT/EXCEPT.

Section 6 of 6Exam technique

Keywords the mark scheme looks for in this lesson

Keywords the mark scheme looks for in this lesson
Band theory · Band gap · Semiconductor · Doping · n-type · p-type · Diode · Transistor · LED · Integrated circuit
Learn each definition in the Key words tab exactly; a missing keyword in a definition usually loses the mark.

How to get full marks (examiner guidance)

1
Answer exactly what is asked; extra correct material does not earn credit, and contradictory statements can cancel credit (AP FRQ).
2
Use precise vocabulary (e.g. “active site”, “concentration gradient”, “allele”), never “it/stuff/things”.
3
Show units and working in calculations.
4
In MCQs, predict the answer before reading the options, then eliminate.

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