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(a) Water splitting tandem cell: photoanode passes NIR light to solar cell, giving cathodic bias for H2 evolution; (b) Dual absorber efficiency curve (ηSTH > 40% at λa ≤ 750nm (1.6 eV), λsc = 750–1300 nm (0.95 eV) (reproduced from [200] with permission from Springer).
