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AFM image (1 × 1 μm2) of an uncapped QD sample.
Dark field (200) cross-sectional TEM images of the InAs/GaAs QDSC structures (a) without and (b) with AlAs CL. The growth direction is in the vertical direction for these two images.
(a) PL spectra of the QDSCs at RT. (b) Comparison of the temperature dependence of the PL efficiency of the QDSC with and without AlAs CL.
(a) External quantum efficiency of InAs/GaAs QDSCs with and without the AlAs CL, and the GaAs reference solar cell. (b) Current density vs. voltage curves for the InAs/GaAs QDSCs with and without AlAs CL, and the GaAs reference solar cell under 1-sun AM1.5 illumination.
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