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We present our progress in attaining high efficiency nc-Si:H solar cells at high deposition rates with superior light soaking stability. We have focused our effort on three areas: (i) improving the spatial uniformity and homogeneous properties for nc-Si:H, such as crystallite grain size and volume fraction, (ii) optimizing nucleation and seed layer during the initial growth of the nc-Si:H film, and...
We fabricated five different types of a-SiGe:H and nc-Si:H based multi-junction solar cell structures using modified very high frequency (MVHF) technology. After optimization, all five structures reached similar initial cell performance, i.e. ~12% small active-area (0.25 cm2) efficiency and 10.6-10.8% large aperture-area (?? 400 cm2) efficiency after encapsulation. However, they showed quite different...
Over the last several years, we have continuously increased the conversion efficiency of solar cells and modules. In this paper, we discuss new developments which led to a ~5% increase in conversion efficiency of cells and modules made using roll-to-roll deposition. The enhanced efficiency is attributed primarily to the replacement of the conventional Al/ZnO back reflector with a new Ag/ZnO structure...
Using silicon photonic wire waveguides we demonstrate highly sensitive and ultra-compact optical circuits for molecular sensing. The high-index-contrast of these structures is exploited to fabricate new folded waveguide geometries beneficial for sensing, as well as optical switching applications.
We present the novel design of a silicon modulator with low operation voltage of les3 V by employing periodically interleaved pn junctions. Simulations predict that in depletion mode it has a high modulation efficiency of better than 1.5 Vldrcm.
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