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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Solar Cell Silicon
Presentation Title Topological Impurity Segregation at Faceted Silicon Grain Boundaries
Author(s) Christian H. Liebscher, Andreas Stoffers, Oana Cojocaru-Mirédin, Baptiste Gault, Christina Scheu, Gerhard Dehm, Dierk Raabe
On-Site Speaker (Planned) Christian H. Liebscher
Abstract Scope One of the most detrimental lattice defects in multicrystalline Silicon (mc-Si) are grain boundaries. Both, the grain boundary structure but also the local chemistry at the interface strongly degrade the electrical performance by increased charge carrier recombination. In our study we establish a direct connection of the atomic structure and chemistry of faceted, symmetrical tilt grain boundaries extracted from a mc-Si wafer. The one-to-one correlation of atomic resolution aberration-corrected scanning transmission electron microscopy (STEM) and 3D atom probe tomography (APT) unravels a novel segregation phenomenon associated with the faceted nature of the boundaries. STEM observes the arrangement of the nanometer sized facets and the underlying atomic structural units. The segregation of Iron and Carbon impurities as determined by APT is confined to the linear junctions of coherent and incoherent grain boundary segments. An outlook on the connection of local strain state and segregation behavior is presented.
Proceedings Inclusion? Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)


Characterization of Composition, Morphology, and Structure of Disi Raw Sandstones in Jordan
Effect of Magnesium Addition on Removal of Impurities from Silicon by Hydrometallurgical Treatment
Electrodeposition of Solar Grade Silicon on Graphite in Molten CaCl2
Electrodynamic Eddy Current Separation of End-of-Life PV Materials
Evaporation Removal of Boron in Molten Silicon Using Reactive Fluxes
Influence of Oxygen Content on the Wettability of Silicon on Graphite
Investigation on Quartz Crucibles for Monocrystalline Silicon Ingots for Solar Cells
Particle Separation in Silicon Ingot Casting Using AC Magnetic Field
Phase Analysis of the Si-O2 System
Study on Producing Solar Grade Silicon by Carbothermal Reduction of Andalusite Ore
Study on the Segregation Behavior of Impurities during Solvent Refining Process
Topological Impurity Segregation at Faceted Silicon Grain Boundaries

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