Concept map - Diode as rectifier

Concept map: 2.8

2.8

Doping

1. Doping is a process of adding a certain amount of specific impurities to semiconductors to increase their conductivity
2. Two types of doping:

• p-type semiconductors
• n-type semiconductors

p-type semiconductors

1. Si (pure/ intrinsic semiconductor) have valency of 4

2. Al (impurity) have four e valens

3. When Al is added to Si, there will be one less e - p-type semiconductor is produced
4. No. of e > No. of holes

n-type semiconductors
1. Si (pure/ intrinsic semiconductor) have valency of 4

2. P (impurity) have three e valens

3. When P is added to Si, there will be one extra e - n-type semiconductor is produced

4. No. of holes > No. of e

Diode Semiconductor

9.2 Understanding Diode Semiconductor

Solids: Conductor VS Semiconductor VS Insulator

1. Conductor: Have free electrons that can drift between their atoms
2. Semiconductor: Have electrons and holes
3. Insulator: Don't have free electron
   

Additional information: Energy bands for solids

The conductivity of semiconductors also can be increased by

• rising the temperature
• shining light on it
• adding impurities to it (doping)
  

ANALYSIS {PHYSICS F5}: MARCH TEST 09

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ANALYSIS {PHYSICS}: SPM 2008

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CRO5

Application of CRO

1. Display the wave forms of voltage

2. Measuring the potential difference (a.c & d.c)

3. Measure a short time of duration/ interval