Contrast how absorption of photons and charge separation occur in each device.

Suggest one advantage a DSSC has over a silicon based photovoltaic cell.

Accept “existence of holes AND electrons at p-n junction” for M2.

[4 marks]

Any of:

cheaper
OR
ease of fabrication
OR
use light of lower energy/lower frequency/longer wavelength
OR
plentiful and renewable resources «to construct DSSC cells»
OR
operate at lower «internal» temperatures/better at radiating heat away «since constructed with thin front layer of conductive plastic compared to glass box in photovoltaic cell»
OR
use of nanoparticles provides large surface area exposure to sunlight/sun/light
OR
can absorb better under cloudy conditions
OR
better conductivity
OR
more flexible

Accept “lower mass/lighter «so greater flexibility to integrate into windows etc.»” OR “greater power-conversion efficiency «with latest DSSC models»”.

[1 mark]