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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...
Following our previous study on the material-quality limiting factors of evaporated solid-phase crystallized (SPC) poly-Si thin films fabricated on planar glass for photovoltaic applications, we extend our study to investigate the impurity levels, optical properties, transport properties, and device performance of so-called ??EVA?? (EVAporated Si) solar cells. These potentially cost-effective cells...
United Solar Ovonic (USO) has developed a-Si:H based solar cells on polymer substrate using high-throughput roll-to-roll deposition technology for space and stratospheric missions. In addition, we have advanced two new developments: (1) the monolithically laser-integrated module on flexible polymer substrate to attain an initial specific power as high as 2343 W/kg at the module level; and (2) a new...
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...
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