Abstract
The current SiHCl3-based processes to produce ultrapure Si are one of the major bottlenecks to lower-cost wafer-Si solar cells. Molten-salt electrorefining of Si is an alternative process to ultrapure Si, with a significantly lower energy input of ∼15 kWh/kg. It is demonstrated that controlling the potential applied to the working electrode is critical in reducing impurity concentrations. A more positive potential on the working results in purer Si deposited on the counter electrode. With margin of error, the amount of Si deposited on the cathode is almost the same as the amount dissolved from the anode. A nonequilibrium factor which affects impurity concentrations is identified, i.e. contamination.
| Original language | English (US) |
|---|---|
| Title of host publication | Conference Record of the IEEE Photovoltaic Specialists Conference |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Pages | 506-510 |
| Number of pages | 5 |
| ISBN (Print) | 9781479932993 |
| DOIs | |
| State | Published - 2013 |
| Event | 39th IEEE Photovoltaic Specialists Conference, PVSC 2013 - Tampa, FL, United States Duration: Jun 16 2013 → Jun 21 2013 |
Other
| Other | 39th IEEE Photovoltaic Specialists Conference, PVSC 2013 |
|---|---|
| Country | United States |
| City | Tampa, FL |
| Period | 6/16/13 → 6/21/13 |
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Keywords
- Electrorefining
- Impurity
- Photovoltaic
- Silicon
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Control and Systems Engineering
- Industrial and Manufacturing Engineering
Cite this
Low-cost ultrapure (>99.9999%) solar-grade Si by electrorefining. / Han, Xiaofei; Zhou, Bin; Tao, Meng.
Conference Record of the IEEE Photovoltaic Specialists Conference. Institute of Electrical and Electronics Engineers Inc., 2013. p. 506-510 6744200.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Low-cost ultrapure (>99.9999%) solar-grade Si by electrorefining
AU - Han, Xiaofei
AU - Zhou, Bin
AU - Tao, Meng
PY - 2013
Y1 - 2013
N2 - The current SiHCl3-based processes to produce ultrapure Si are one of the major bottlenecks to lower-cost wafer-Si solar cells. Molten-salt electrorefining of Si is an alternative process to ultrapure Si, with a significantly lower energy input of ∼15 kWh/kg. It is demonstrated that controlling the potential applied to the working electrode is critical in reducing impurity concentrations. A more positive potential on the working results in purer Si deposited on the counter electrode. With margin of error, the amount of Si deposited on the cathode is almost the same as the amount dissolved from the anode. A nonequilibrium factor which affects impurity concentrations is identified, i.e. contamination.
AB - The current SiHCl3-based processes to produce ultrapure Si are one of the major bottlenecks to lower-cost wafer-Si solar cells. Molten-salt electrorefining of Si is an alternative process to ultrapure Si, with a significantly lower energy input of ∼15 kWh/kg. It is demonstrated that controlling the potential applied to the working electrode is critical in reducing impurity concentrations. A more positive potential on the working results in purer Si deposited on the counter electrode. With margin of error, the amount of Si deposited on the cathode is almost the same as the amount dissolved from the anode. A nonequilibrium factor which affects impurity concentrations is identified, i.e. contamination.
KW - Electrorefining
KW - Impurity
KW - Photovoltaic
KW - Silicon
UR - http://www.scopus.com/inward/record.url?scp=84896443513&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84896443513&partnerID=8YFLogxK
U2 - 10.1109/PVSC.2013.6744200
DO - 10.1109/PVSC.2013.6744200
M3 - Conference contribution
AN - SCOPUS:84896443513
SN - 9781479932993
SP - 506
EP - 510
BT - Conference Record of the IEEE Photovoltaic Specialists Conference
PB - Institute of Electrical and Electronics Engineers Inc.
ER -