DP Chemistry (last assessment 2024)

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Question 20N.3.hl.TZ0.a

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.3.hl.TZ0.a
Level hl Paper 3 Time zone TZ0
Command term Describe Question number a Adapted from N/A
a.
[Maximum mark: 2]
20N.3.hl.TZ0.a

Doping of silicon increases the conductivity in semiconductors.

Describe the doping in p-type and n-type semiconductors.

[2]

Markscheme

p-type:
«small amount of» B/Al/Ga/In/Tl/Group 13 element produces holes ✔

n-type:
«small amount of» Sb/P/As/Bi/Group 15 element adds extra electrons ✔


Award [1 max] for correct element type for p AND n OR p-type: “produces holes” AND n-type: adds extra electrons”.

Examiners report

The description of doping in p- and n-type semiconductors was well expressed and the majority scored both marks.

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