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With decreasing module prices on the spot market, the cost of silver is getting more and more important in solar cell fabrication. Silver is necessary for the front side metallization and the rear side bus bar metallization in a solar cell. The front side benefits from the good conductivity of silver whereas the rear side bus bars need the low oxidation degree and thus the good solderability of this...
The effects of reverse bias stressing have been studied on CuInGaSe2 thin-film solar cell devices. Finished cells were subjected to treatments of various levels of negative voltage bias at different temperatures and for different durations. Metastable changes in the defect profiles as measured by drive-level capacitance profiling (DLCP) were observed. Modeling of the effects suggests a mechanism in...
The maximum power conversion efficiency of a solar cell as defined by the Shockley-Queisser (SQ) radiative recombination limit relies on the assumption that the collection probability for all photogenerated electron/hole-pairs is unity. This assumption implies a virtually infinite mobility mu of the photogenerated charge carriers. In order to compute the radiative efficiency limit with finite mobility,...
Small-area Cu(In,Ga)Se 2 thin film solar cells have reached more than 19% efficiencies. Compared to other polycrystalline materials this efficiency value is remarkable. Nevertheless, the 19% for Cu(In,Ga)Se 2 range more than 6% (absolute) below the world's best single-crystalline Si cells and almost 14% below the upper theoretical limit of 33% for an ideal black body cell with infinitely...
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