| 摘要 |
A method and structure for a photo-active region (20) for generation of free carriers when a first surface is exposed to optical radiation. The photo-active region (20) includes a conducting transparent matrix (24) and clusters (22, 26, 28, 30) of semiconductor materials embedded within the conducting transparent matrix (24). The clusters are arranged in the matrix material so as to define at least a first distribution of cluster sizes ranging from those with the highest bandgap energy near a light incident surface of the photo-active region to those with the smallest bandgap energy near an opposite second surface of the photo-active region. Also disclosed is a method and structure for a solar cell. The solar cell includes a photo-active region (20) containing a plurality of semiconductor clusters (22, 26, 28, 30) of varying sizes as described.
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