) At room temperature, the dark saturation eurrent density ot junetion cells mad
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Question
) At room temperature, the dark saturation eurrent density ot junetion cells made from material 1 is typically 10-s A/mamo. lm the cat m2; responding figure for cells from material 2 is 10-11 Alii the these materials would you expect to have the smaller band gan?ch ot /m2, lie cot. (b) A p-n heterojunction is formed between these two materials, Ae ing the absence of current-limiting spikes at the metallurgical junction and similar lattice structures so that there is little mismatch at junction, estimate the dark saturation current density expected from this heterojunction. Which material is most important in determin ing the open-circuit voltage of the cell? (c) Which material will set the upper limit to the number of electron-hole pairs generated in the heterojunction and hence the short-circuit current?Explanation / Answer
i) Given
Dark saturation current for material 1= 10-8A/m2
and for material 2=10-11A/m2
Dark saturation current is inversely proportional to band gap so the band gap is smaller in material 1
ii)
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