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Journal article
Imaging As-Grown Interstitial Iron Concentration on Boron-Doped Silicon Bricks via Spectral Photoluminescence
IEEE journal of photovoltaics, v 4(5), pp 1185-1196
Sep 2014
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The interstitial iron concentration measured directly on the side face of a silicon brick after crystallization and brick squaring can give important early and fast feedback regarding its material quality. Interstitial iron is an important defect in crystalline silicon, particularly in directionally solidified ingots. Spectral photoluminescence intensity ratio imaging has recently been demonstrated to independently provide high-resolution bulk lifetime images and is therefore ideally suited to assess spatially variable multicrystalline silicon bricks. Here, we demonstrate this technique to enable imaging of the interstitial iron concentration on boron-doped silicon bricks and thick silicon slabs. We present iron concentration studies for two directionally solidified silicon bricks of which one is a standard multicrystalline and the other is a seeded-growth ingot. This lifetime-based measurement technique is highly sensitive to interstitial iron with detection limits down to concentrations of about 1 × 10 10 cm -3 . Its accuracy is enhanced, as the injection level remains below 2 × 10 12 cm -3 during the measurement and, hence, avoids the influence of injection level dependences on the conversion factor, although it remains dependent on the knowledge of the electron capture cross section of interstitial iron in silicon. Access to both bulk lifetime and dissolved iron concentration provides a valuable parameter set of as-grown crystal quality and the relative recombination fraction of interstitial iron via Shockley-Read-Hall (SRH) analysis. Simulated interstitial iron concentration profiles support the presented experimental data.
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Details
- Title
- Imaging As-Grown Interstitial Iron Concentration on Boron-Doped Silicon Bricks via Spectral Photoluminescence
- Creators
- Bernhard Mitchell - UNSW SydneyDaniel Macdonald - Australian National UniversityJonas Schon - Fraunhofer Institute for Solar Energy SystemsJurgen W Weber - Spiekermann and WegenerHannes Wagner - Leibniz University HannoverThorsten Trupke - UNSW Sydney
- Publication Details
- IEEE journal of photovoltaics, v 4(5), pp 1185-1196
- Publisher
- IEEE
- Grant note
- German Federal Ministry for the Environment 0325270A-H / Nature Conservation and Nuclear Safety within the research cluster ¿SolarWinS¿ Australian Research Council (10.13039/501100000923) Australian Renewable Energy Agency; Australian Government through the Australian Renewable Energy Agency (10.13039/501100005105)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems
- Web of Science ID
- WOS:000344542500003
- Scopus ID
- 2-s2.0-84906785799
- Other Identifier
- 991019320611304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Energy & Fuels
- Materials Science, Multidisciplinary
- Physics, Applied