Ultra thin silicon solar cell
Astrowatt's process deposits 50 microns of metal onto a monocrystalline silicon wafer. The substrate is "exfoliated" using a thermal cleaving process, creating an ultra-thin ~25 um silicon metal substrate. The process reuses a one-millimeter-thick 1-0-0 silicon substrate for the multiple exfoliations. The silicon can withstand a standard texturing step despite its thinness.
So, the substrates are 25 to 50 microns thick and use just 0.22 grams per watt of silicon. Vass said that the firm has a roadmap to get to a cost of less then $0.30 per watt, compared to the current costs of $0.70 to $0.80 per watt. The company targets 22 percent to 23 percent efficiency and is starting to move toward commercialization.
N6 solar cell silicon purity costs per Kg :
http://www.cam.ac.uk/research/news/solar-grade-silicon-at-low-cost
Based on the results of an independent economic survey, he believes that the process will drive down the cost of manufacturing solar-grade silicon from around the current $40–200/kg to a maximum of $8/kg, making solar power a more affordable option to generate power.
R&D result 2018
If $8/kg N6 solar grade silicon then $0,008/gr
and
$0,00176/Wp Astrowatt process silicon investment value
= < 1/5 US$cent per Wattpeak solar cell
Sincerely
OCWL
http://www.asianfinancialforum.com/aff2012/pdf/aff_2012/synopsis/geraldstaruiala_ppt_en.pdf
Wow, the solar cell market price is in fast movement :
https://translate.google.com/translate?hl=de&sl=auto&tl=en&u=https%3A%2F%2Fwww.taz.de%2F!5588101%2F (https://translate.google.com/translate?hl=de&sl=auto&tl=en&u=https%3A%2F%2Fwww.taz.de%2F!5588101%2F)
March 2019 :
16 US$cents/Wp
https://energypost.eu/fraunhofer-solar-power-will-cost-2-ctskwh-2050/ (https://energypost.eu/fraunhofer-solar-power-will-cost-2-ctskwh-2050/)
Not 2050 but soon 2020 the 2 cents/KWh barrier can become reached.
https://www.agora-energiewende.de/en/projects/the-outlook-for-the-cost-of-solar-power-until-2050/ (https://www.agora-energiewende.de/en/projects/the-outlook-for-the-cost-of-solar-power-until-2050/)