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Nitrogen δ-doped GaAs superlattices were fabricated and their energy structures were investigated. Several transitions related to E+ band of nitrogen δ-doped regions were observed in photoreflectance (PR) spectra at energies ranging 1.5-1.7 eV for the superlattices at which no transitions were observed for uniformly doped GaAsN. The PR signal intensity of E+ related band transitions is significantly higher than those observed in uniformly doped GaAsN. This enhancement of E+ related band transitions is advantageous as an intermediate band material, and thus, nitrogen δ-doped GaAs superlattice structures are expected to be an excellent alternative for the use of intermediate band solar cells.
Date of Conference: 3-8 June 2012