Abstract
In this work, flat solar cells with vertically aligned p-n junctions are designed. Luminescent down-shifting layers are used for enhancement of the solar cells’ efficiency. The solar cells are fabricated with the architecture of double aligned p-n junctions and contain additional coatings with CdTe/CdS luminescent nanocrystals. Current-voltage characteristics of the solar cells are measured using a solar simulator with a pulsed halogen light source. The influence of the average diameter of the CdTe/CdS nanocrystals in the series of 2.8, 3.6 and 4 nm and related to its emission at the wavelengths of 548, 609, and 642 nm, respectively, on the solar cells’ efficiency is studied and discussed. A flat solar cell with vertically aligned p-n junctions containing luminescent down-shifting layers of the nanocrystals that are 4.0 nm in diameter demonstrates a power conversion efficiency of 9% on an area of 1cm2.
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