American Institute of Physics, Applied Physics Letters, 9(88), p. 092110
DOI: 10.1063/1.2181627
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We have synthesized GaNxAs1−yPy alloys (x ∼ 0.003−0.01 and y = 0–0.4) using nitrogen (N) ion implantation into GaAsP epilayers followed by pulsed laser melting and rapid thermal annealing techniques. As predicted by the band anticrossing model, the incorporation of N splits the conduction band of the GaAs1−yPy substrate, and strong optical transitions from the valence band to the lower (E−) and upper (E+) conduction subbands are observed. The relative strengths of the E− and E+ transition change as the localized N level EN emerges from the conduction band forming narrow intermediate band for y>0.3. The results show that GaNxAs1−x−yPy alloys with y>0.3 is a three band semiconductor alloy with potential applications for high-efficiency intermediate band solar cells.