help w/ chem question?

Question

Solar cell A uses a semiconductor with a band gap of 1 eV. Solar cell B uses a semiconductor with a band gap of 2 eV. Either cell is thick enough to absorb all the light above its band gap. Both cells can work simultaneously with one on top of the other to operate more efficiently in a small space. Which cell has to be on top (first to receive the sunlight) for both to work simultaneously, and why?


I thought of the problem in two ways. The first was that the one w/ the larger band gap is an insulator and hence should be placed on the bottom b/c if it were on the top the one with the smaller band gap on the bottom wouldn't get any energy. The second way was that the one with the larger band gap should be on top because it could only absorb 2 eV and above, thus energy less than 2 eV would "pass through" to the bottom one so that energy between 1 and 2 eV could be utilized.

Answer 1

B.

B has a greater band gap, thus, the light which activates B can also activate A.

Answer 2

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