1. Synchrotron-based microanalysis of iron distribution after thermal processing and predictive modeling of resulting solar cell efficiency
- Author
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Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Photovoltaic Research Laboratory, Fenning, David P., Bertoni, Mariana I., Buonassisi, Tonio, Hofstetter, Jasmin, Lelievre, J. F., del Canizo, C., Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Photovoltaic Research Laboratory, Fenning, David P., Bertoni, Mariana I., Buonassisi, Tonio, Hofstetter, Jasmin, Lelievre, J. F., and del Canizo, C.
- Abstract
Synchrotron-based X-ray fluorescence microscopy is applied to study the evolution of iron silicide precipitates during phosphorus diffusion gettering and low-temperature annealing. Heavily Fe-contaminated ingot border material contains FeSi2 precipitates after rapid in-line P-diffusion firing, suggesting kinetically limited gettering in these regions. An impurity-to-efficiency (I2E) gettering model is developed to explain the results. The model demonstrates the efficacy of high- and medium-temperature processing on reducing the interstitial iron population over a range of process parameters available to industry., United States. Dept. of Energy (contract number DE-FG36-09GO1900), National Science Foundation (U.S.) (NSF Graduate Research Fellowship), Barcelona Chamber of Commerce (MIT-Spain/La Cambra de Barcelona Seed Fund)
- Published
- 2013