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Optimization of mesh-structured emitters


Ossenbrink, H.A.:
Fourteenth European Photovoltaic Solar Energy Conference 1997. Proceedings. Vol.1 : International conference held at Barcelona, Spain, 30 June-4 July 1997
Bedford: Stephens, 1997
ISBN: 1-901675-03-5
ISBN: 1-901675-01-9
ISBN: 1-901675-02-7
European Photovoltaic Solar Energy Conference <14, 1997, Barcelona>
Conference Paper
Fraunhofer ISE ()

The mesh-structured emitter is a mesh of highly doped emitter lines formed by etching a texturization pattern into a wafer which previously received a highly doped homogeneous emitter diffusion. Thus, the lateral conductivity can be increased while keeping the emitter dark saturation current at an acceptable level. Solar cells have been fabricated using the new process scheme exhibiting efficiencies up to 22.7 %. The lifetimes of test structures were measured in order to determine the dark saturation current of different emitter types. Additionally, a new method for the calculation of effective surface recombination velocities (respectively dark saturation currents) of textured surfaces is introduced.