High-efficiency micromorph solar cell with light management in tunnel recombination junction
Solar Energy Materials and Solar Cells(2016)
摘要
Effective tunnel recombination junctions (TRJs) are crucial to achieve high conversion efficiencies in hydrogenated amorphous/ microcrystalline silicon (a-Si:H/μc-Si:H) micromorph solar cells. In conventional TRJs, the n-μc-Si:H layer is used to form an ohmic contact between the n- and p-type layers, which introduces additional absorption loss in the TRJs. Here we demonstrated an effective TRJ without using the n-μc-Si:H layer in a-Si:H/μc-Si:H micromorph solar cells, which we denote as an evolutionary TRJ. In comparison to the conventional n-μc-SiOx:H/n-μc-Si:H/p-nc-SiOx:H TRJs, the evolutionary structure reduces the parasitic absorption and thus significantly increases the short-circuit current density (JSC) of the bottom cell. A high initial efficiency of 13.65% has been achieved for the a-Si:H/μc-Si:H micromorph solar cells deposited on the as-grown metal organic chemical vapor deposited ZnO:B substrates.
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关键词
Hydrogenated amorphous/microcrystalline silicon,Micromorph solar cell,Tunnel recombination junction,Silicon oxide film,Intermediate reflector layer
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