期刊
APPLIED PHYSICS LETTERS
卷 108, 期 20, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4950765
关键词
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资金
- National Science Foundation (NSF)
- Department of Energy (DOE) under NSF CA [EEC-1041895]
- DOE Office of Science [DE-AC02-06CH11357]
- NSF [ECS-0335765, 1122374]
- Department of Defense through the NDSEG fellowship program
- Martin Family Society of Fellows for Sustainability
- University of California, San Diego
Solar cells based on n-type multicrystalline silicon (mc-Si) wafers are a promising path to reduce the cost per kWh of photovoltaics; however, the full potential of the material and how to optimally process it are still unknown. Process optimization requires knowledge of the response of the metal-silicide precipitate distribution to processing, which has yet to be directly measured and quantified. To supply this missing piece, we use synchrotron-based micro-X-ray fluorescence (mu-XRF) to quantitatively map >250 metal-rich particles in n-type mc-Si wafers before and after phosphorus diffusion gettering (PDG). We find that 820 degrees C PDG is sufficient to remove precipitates of fast-diffusing impurities and that 920 degrees C PDG can eliminate precipitated Fe to below the detection limit of mu-XRF. Thus, the evolution of precipitated metal impurities during PDG is observed to be similar for n-and p-type mc-Si, an observation consistent with calculations of the driving forces for precipitate dissolution and segregation gettering. Measurements show that minority-carrier lifetime increases with increasing precipitate dissolution from 820 degrees C to 880 degrees C PDG, and that the lifetime after PDG at 920 degrees C is between the lifetimes achieved after 820 degrees C and 880 degrees C PDG. Published by AIP Publishing.
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