DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ2.20b

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.hl.TZ2.20b
Level hl Paper 3 Time zone TZ2
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
19M.3.hl.TZ2.20b

Semiconductors and light-sensitive dyes are used in photovoltaic cells.

(b)

Explain the function of dyes in a dye-sensitized solar cell (DSSC).

[2]

Markscheme

dye absorbs light  [✔]

electrons from «excited» dye pass to TiO2/semiconductor/electrolyte/cell
OR
dye undergoes photo-oxidation [✔]

Examiners report

The question on dye-sensitized solar cell invited mixed responses. While most candidates correctly stated that dyes absorb light but several failed to mention that electrons from the excited dye pass to TiO2/semiconductor.

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