Salam Aidil Fitri 09

SELAMAT HARI RAYA AIDIL FITRI 2009
"Ulangkaji Fizik jangan dilupakan"

Finish syllabus

Has finish Form 5 syllabus today (13 July 09)
Will concentrate on revision & drill exercise.

New weblog for form4 revision

http://f5y09smsl1.blogspot.com/

By SM Sains Labuan Form5 students
TQ

Concept map - Transistor

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