Silicon: Difference between revisions
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=Purity Levels= | =Purity Levels= | ||
*Metallurgical grade silicon is | *Metallurgical grade silicon is 98% (one nine?) [https://www.google.com/search?sxsrf=ALeKk026QG9BbsZl0rNsBS9KmerMgczY_w%3A1602863734253&source=hp&ei=dsKJX6q8DJDYsAXHkpG4Cw&q=how+many+nines+pure+is+metallurgical+grade+silicon&btnK=Google+Search&oq=how+to+configure+nvidia+geforce+gtx+1650+super+on+linux+mint&gs_lcp=CgZwc3ktYWIQAzIFCCEQoAEyBQghEKsCMgUIIRCrAjoOCAAQ6gIQtAIQmgEQ5QI6DgguELEDEMcBEKMCEJMCOggILhDHARCvAToLCC4QsQMQxwEQowI6CAgAELEDEIMBOggILhCxAxCDAToFCAAQsQM6AggAOgQIABAKOgYIABAWEB46CAghEBYQHRAeOgcIIRAKEKABUMsQWOmzAWD8tAFoBnAAeACAAeQGiAGhS5IBDTExLjQ3LjMuMi42LTGYAQCgAQGqAQdnd3Mtd2l6sAEG&sclient=psy-ab&ved=0ahUKEwiqz4DcvLnsAhUQLKwKHUdJBLcQ4dUDCAk&uact=5] | ||
*Microchip silicon (Electronic Grade Silicon) is nine nines pure, whereas power transistor silicon is 6 nines. [https://www.google.com/search?sxsrf=ALeKk026QG9BbsZl0rNsBS9KmerMgczY_w%3A1602863734253&source=hp&ei=dsKJX6q8DJDYsAXHkpG4Cw&q=is+power+transistor+grade+silicon+as+pure+as+silicon+for+microchips&btnK=Google+Search&oq=how+to+configure+nvidia+geforce+gtx+1650+super+on+linux+mint&gs_lcp=CgZwc3ktYWIQAzIFCCEQoAEyBQghEKsCMgUIIRCrAjoOCAAQ6gIQtAIQmgEQ5QI6DgguELEDEMcBEKMCEJMCOggILhDHARCvAToLCC4QsQMQxwEQowI6CAgAELEDEIMBOggILhCxAxCDAToFCAAQsQM6AggAOgQIABAKOgYIABAWEB46CAghEBYQHRAeOgcIIRAKEKABUMsQWOmzAWD8tAFoBnAAeACAAeQGiAGhS5IBDTExLjQ3LjMuMi42LTGYAQCgAQGqAQdnd3Mtd2l6sAEG&sclient=psy-ab&ved=0ahUKEwiqz4DcvLnsAhUQLKwKHUdJBLcQ4dUDCAk&uact=5]. Solar grade silicon is same purity as transistor grade - 6 nines. [https://www.google.com/search?q=how+many+nines+pure+is+solar+grade+silicon&sca_esv=4ea9ed7b68a81626&sxsrf=ADLYWILUYubJ8N748Zd9-W6Q4ytZ_PDmiQ%3A1733709816649&ei=-E9WZ6iaJ67pwN4PncHlwA8&ved=0ahUKEwio9o6uzJmKAxWuNNAFHZ1gGfgQ4dUDCA8&uact=5&oq=how+many+nines+pure+is+solar+grade+silicon&gs_lp=Egxnd3Mtd2l6LXNlcnAiKmhvdyBtYW55IG5pbmVzIHB1cmUgaXMgc29sYXIgZ3JhZGUgc2lsaWNvbjIFECEYoAEyBRAhGKABMgUQIRigATIFECEYqwIyBRAhGKsCMgUQIRirAjIFECEYnwVIzShQAFiOJ3AEeAGQAQCYAXigAb8SqgEEMjAuNbgBA8gBAPgBAZgCHaACjxPCAgQQIxgnwgIIEAAYgAQYogSYAwCSBwQyMC45oAfaiQE&sclient=gws-wiz-serp]. | *Microchip silicon (Electronic Grade Silicon) is nine nines pure, whereas power transistor silicon is 6 nines. [https://www.google.com/search?sxsrf=ALeKk026QG9BbsZl0rNsBS9KmerMgczY_w%3A1602863734253&source=hp&ei=dsKJX6q8DJDYsAXHkpG4Cw&q=is+power+transistor+grade+silicon+as+pure+as+silicon+for+microchips&btnK=Google+Search&oq=how+to+configure+nvidia+geforce+gtx+1650+super+on+linux+mint&gs_lcp=CgZwc3ktYWIQAzIFCCEQoAEyBQghEKsCMgUIIRCrAjoOCAAQ6gIQtAIQmgEQ5QI6DgguELEDEMcBEKMCEJMCOggILhDHARCvAToLCC4QsQMQxwEQowI6CAgAELEDEIMBOggILhCxAxCDAToFCAAQsQM6AggAOgQIABAKOgYIABAWEB46CAghEBYQHRAeOgcIIRAKEKABUMsQWOmzAWD8tAFoBnAAeACAAeQGiAGhS5IBDTExLjQ3LjMuMi42LTGYAQCgAQGqAQdnd3Mtd2l6sAEG&sclient=psy-ab&ved=0ahUKEwiqz4DcvLnsAhUQLKwKHUdJBLcQ4dUDCAk&uact=5]. Solar grade silicon is same purity as transistor grade - 6 nines. [https://www.google.com/search?q=how+many+nines+pure+is+solar+grade+silicon&sca_esv=4ea9ed7b68a81626&sxsrf=ADLYWILUYubJ8N748Zd9-W6Q4ytZ_PDmiQ%3A1733709816649&ei=-E9WZ6iaJ67pwN4PncHlwA8&ved=0ahUKEwio9o6uzJmKAxWuNNAFHZ1gGfgQ4dUDCA8&uact=5&oq=how+many+nines+pure+is+solar+grade+silicon&gs_lp=Egxnd3Mtd2l6LXNlcnAiKmhvdyBtYW55IG5pbmVzIHB1cmUgaXMgc29sYXIgZ3JhZGUgc2lsaWNvbjIFECEYoAEyBRAhGKABMgUQIRigATIFECEYqwIyBRAhGKsCMgUQIRirAjIFECEYnwVIzShQAFiOJ3AEeAGQAQCYAXigAb8SqgEEMjAuNbgBA8gBAPgBAZgCHaACjxPCAgQQIxgnwgIIEAAYgAQYogSYAwCSBwQyMC45oAfaiQE&sclient=gws-wiz-serp]. | ||
*3 nines pure by acid leaching [https://www.sciencedirect.com/science/article/abs/pii/0304386X9090007O#:~:text=The%20purification%20of%20metallurgical%20grade,4%2C%20HCl%20and%20HF).] | *3 nines pure by acid leaching [https://www.sciencedirect.com/science/article/abs/pii/0304386X9090007O#:~:text=The%20purification%20of%20metallurgical%20grade,4%2C%20HCl%20and%20HF).] | ||
Revision as of 02:09, 9 December 2024
Working Doc
Purity Levels
- Metallurgical grade silicon is 98% (one nine?) [1]
- Microchip silicon (Electronic Grade Silicon) is nine nines pure, whereas power transistor silicon is 6 nines. [2]. Solar grade silicon is same purity as transistor grade - 6 nines. [3].
- 3 nines pure by acid leaching [4]
Purity Levels
- Microchip silicon is nine nines pure, whereas power transistor silicon is 6 nines. [5]
PV Panel Embodied Energy
See this reference for more detail [6]- And this discusses poly si vs mono si [7]
- embodied energy of 165-375 kWhr/kg [8]
- Good news - 65% of all energy goes into the wafers, as opposed to everything else (glass + All + EVA) according to same link
- Similar for amorphous silicon [9]
- Compare to steel at 20 MJ/kg [10], and 200MJ/kg more than this for aluminum [11]
- How many grams of silicon are needed for 1kW of PV panels? 2 kg [12], based on 2g/W.
- 5% of weight of PV is silicon [13]. 76% is glass, 10% is aluminum, and 10% is EVA.
- Embodied energy of EVA is about 80 mega joules per kilogram [14]
Total for 1kW of PV
- 600 kWhr for 2 kg of silicon
- 3kWhr per kg for glass, or 90 kWhr for 30 kg glass. [15]
- About 40 kWhr per my of EVA/aluminum x 8 kg = 320 kwhr
- Total 1010 kWhr
- if the low estimate of 165 kilowatt hours above is true and this is 65% of the energy required then we have around 300 kilowatt hours of energy for wafers, and total around 500 kWhr for 1 kW of new PV panels - meaning energy payback of around 1/4 year!
- The case here would be easy for open sector PV production
- 365*6kWhr~2100 kWhr/yr
- Payback is thus 1/2 yr with only the above.
- This matches results from Fraunhofer 2021, close enough - .7-1.4 year payback time. [16]
Links
- DIY Glacial Acetic Acid
- Wikipedia says 585 kWhr/m2 of PV panels? [17]