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Spin‐photodiodes based on Fe/MgO/Ge(001) heterostructures are reported. These devices perform the room‐temperature integrated electrical detection of the spin polarization of a photocurrent generated by circularly polarized photons with a wavelength of 1300 nm, for light pulses with intensity I0 down to 200 μW. A forward and reverse‐biased average photocurrent variation of 5.9% is measured for the...