Passivating Dopant Sources for High-Efficiency n-type Silicon Solar Cells

Passivating Dopant Sources for High-Efficiency n-type Silicon Solar Cells
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ISBN: 9783839612071
Autor: Bernd Steinhauser
Einband/Bindung: Taschenbuch
Sprache: Englisch
Seitenzahl: 287
Erscheinungsjahr: 2017
Verlag: Fraunhofer Verlag
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Beschreibung
Passivated emitter and rear locally diffused silicon solar cells have proven to offer a high efficiency potential, but there were doubts about the industrial feasibility due to the complex structuring being required for device fabrication. The PassDop concept introduced an approach that allowed reducing the number of process steps significantly by using doped passivation layers in combination with a laser process.The first topic of this work is focused on the development and characterization of the multifunctional layers that form a central part of this concept. Here new layers based on a-SiNx:P are introduced. It is shown that layers for both low temperature device fabrication as well as firing stable layers (for screen printed contacts) are viable. The next part aims for an improved understanding of the properties and implications of the local laser processing. The laser spots are analyzed with focus on doping profiles, impurities as well as minority carrier recombination. Finally the transfer of the concept to the device level is described demonstrating that with this industrially feasible approach high efficiency solar cells can be fabricated achieving efficiencies up to 23.5 percent.
Artikel-Nr.: 9783839612071
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