Publications

Transition metal co-precipitation mechanisms in silicon

Intermetallic phases and transition metal interaction in mc-silicon

Transition metal interaction and Ni-Fe-Cu-Si phases in silicon

Physical mechanisms of in situ surface gettering of metals in ribbon silicon for solar cells

Control of metal impurities in “dirty” multicrystalline silicon for solar cells

From understanding towards engineering metal impurities in multicrystalline silicon

Transition metal interaction and formation of intermetallic phases in multicrystalline silicon

Complex intermetallic phase in multicrystalline silicon doped with transition metals for low-cost solar cells

Transition metals in photovoltaic-grade cast multicrystalline silicon: Assessing the role of impurities in silicon nitride crucible lining material

Chemical natures and distributions of metal impurities in multicrystalline silicon materials

Metal precipitation at grain boundaries in silicon: Dependence on grain boundary character and dislocation decoration

Engineering metal-impurity nanodefects for low-cost solar cells

Metal particle evolution during solar cell processing in multicrystalline silicon

15th workshop on Crystalline Silicon Solar Cells & Modules: Materials and Processes, Editor: B.L.Sopori, NREL, Golden, CO, pp.174-177 (2005).

Quantifying the effect of metal-rich precipitates on minority carrier diffusion length in multicrystalline silicon using synchrotron-based spectrally-resolved X-ray beam induced current

Local measurements of diffusion length and chemical character of metal clusters in multicrystalline silicon

Distinguishing the impacts of individual metal species on multicrystalline silicon performance in a multiple metal environment

Synchrotron-based investigations of the nature and impact of iron contamination in multicrystalline silicon solar cells

Analysis of copper-rich preciptiates in silicon: Chemical state, gettering, and impact on multicrystalline silicon solar cell material

Impact of metal silicide precipitate dissolution during rapid thermal processing of multicrystalline silicon solar cells

Synchrotron-based investigations into metallic impurity distribution and defect engineering in multicrystalline silicon via thermal treatments

Impact of iron contamination in multicrystalline silicon solar cells: Origins, chemical states, and device impacts

X-ray beam induced current/microprobe x-ray fluorescence: synchrotron radiation based x-ray microprobe techniques for analysis of the recombination activity and chemical nature of metal impurities in silicon

Applications of synchrotron radiation x-ray techniques on the analysis of the behavior of transition metals in solar cells and single crystalline silicon with extended defects

Observation of transition metals at shunt locations in multicrystalline silicon solar cells

Metal content of multicrystalline silicon for solar cells

Metal content of multicrystalline silicon for solar cells and its impact on minority carrier diffusion length

Assessing the role of transition metals in shunting mechanisms using synchrotron-based techniques

Application of x-ray synchrotron techniques to the characterization of the chemical nature and recombination activity of grown-in and process-induced defects and impurities in solar cells

Application of synchrotron radiation based x-ray microprobe techniques for the analysis of recombination activity of metals precipitated at Si/SiGe misfit dislocations

X-ray beam induced current – a synchrotron radiation based technique for the in situ analysis of recombination properties and chemical nature of metal clusters in silicon

Synchrotron-based infrared spectromicroscopy of oxygen gettering by grain boundaries in multicrystalline silicon

15th workshop on Crystalline Silicon Solar Cells & Modules: Materials and Processes, Editor: B.L.Sopori, NREL, Golden, CO, pp.178-181 (2005).

Efficiency-limiting ‘defect bands’ in string ribbon silicon: correlations between structural, impurity, and electrical properties

15th workshop on Crystalline Silicon Solar Cells & Modules: Materials and Processes, Editor: B.L.Sopori, NREL, Golden, CO, pp.170-173 (2005).

Synchrotron-based spectrally-resolved X-ray beam induced current: a technique to quantify the effect of metal-rich precipitates on minority carrier diffusion length in multicrystalline silicon

Assessing the role of impurities in silicon nitride crucible lining material as a potential source of metal contamination in photovoltaic-grade ingot-cast multicrystalline silicon

15th workshop on Crystalline Silicon Solar Cells & Modules: Materials and Processes, Editor: B.L.Sopori, NREL, Golden, CO, pp.162-165 (2005).

EXAFS studies on Ni11.6Fe2.8Cu0.4Si27.6 precipitates in multicrystalline silicon

15th workshop on Crystalline Silicon Solar Cells & Modules: Materials and Processes, Editor: B.L.Sopori, NREL, Golden, CO, pp.158-161 (2005).

Transition metals in silicon solar cells: sources of contamination, interactions, defect engineering

15th workshop on Crystalline Silicon Solar Cells & Modules: Materials and Processes, Editor: B.L.Sopori, NREL, Golden, CO, pp.70-77 (2005).

Improvement of solar grade silicon through defect control

Freiberger Siliciumtage, Freiberg, Germany (2005).

The impact of chemical state and thermal stability of metal precipitates on gettering efficiency in silicon

The impact of metal impurity clusters on solar cell performance in multicrystalline silicon

Differences and similarities between metal clusters in mc-Si materials from different manufacturers

Proc. 14th workshop on crystalline silicon solar cell materials and processes, B. L. Sopori, Editor, NREL, Winter Park, CO, pp.226-229 (2004).

Aluminum gettering and dissolution of Cu3Si precipitates in silicon

Dependence of precipitation behavior of Cu and Ni in CZ and multicrystalline silicon on cooling conditions

Distribution and chemical state of Cu-rich clusters in silicon

Transition metals in multicrystalline solar cells: Understanding the nature, origins and impacts of metal contamination in multicrystalline Si and minimizing its impact on solar cell performance

Neutron activation analysis study of metal content of multicrystalline silicon for cost-efficient solar cells

Proc. 13th workshop on crystalline silicon solar cell materials and processes, B. L. Sopori, Editor, NREL, Vail, CO, pp.158-161 (2003).

Experimental procedure for determination of the depth of metal clusters in XBIC/µ-XRF mapping of metal clusters in silicon solar cells

Proc. 13th workshop on crystalline silicon solar cell materials and processes, B. L. Sopori, Editor, NREL, Vail, CO, pp.102-105 (2003).

Statistically meaningful data on the chemical state of iron precipitates in processed multicrystalline silicon using synchrotron-based x-ray absorption spectroscopy

Proc. 13th workshop on crystalline silicon solar cell materials and processes, B. L. Sopori, Editor, NREL, Vail, CO, pp.96-101 (2003).

Impact of metal impurities on solar cell performance

Application of synchrotron radiation based x-ray microprobe techniques for the analysis of recombination activity of metals precipitated at Si/SiGe misfit dislocations

Analysis of shunts in multicrystalline silicon solar cells using microprobe x-ray fluorescence technique

Proc. 12th workshop on crystalline silicon solar cell materials and processes, B. L. Sopori, Editor, NREL, Breckenridge, CO, pp.266-270 (2002).

Application of x-ray fluorescence microprobe technique for the analysis of fully processed solar cells

Proc. 11th workshop on crystalline silicon solar cell materials and processes, B. L. Sopori, Editor, NREL, Golden, CO, pp.172-176 (2001).