The photoresponsivity spectra of double-barrier resonant tunnelling diodes have been measured in a wide range of light wavelength as well as applied voltage. The complex behaviour of measured spectra is analysed, taking into account different channels for electron injection into the quantum well (QW). The results obtained yield evidence for modulated electron-hole (e-h) recombination in the QW provided by direct excitation of e-h pairs in the QW.
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