Approximate effectiveness evaluation of Si solar cell tandem with photothermopile

The idea that it is feasible to develop commercial solar cells tandem with a photothermopile based on a narrow-gap semiconductor is proposed. The operation and efficiency of a Si solar cell in tandem with a photothermopile based on a semiconductor with a band gap of ∼0.3 eV is discussed. It is shown that, at an operating temperature of 60–75°C, the tandem efficiency can be increased by more than 50% as compared with the Si solar cell efficiency.

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