UNSW Solar phosphorus (POCl) diffusion for silicon solar cells

Tube diffusion is the de facto standard way to form the p-n junction in industrial silicon solar cells. The majority of silicon solar cells are produced from p-type silicon and consequently, a phosphorus diffusion is used to create a heavily doped n-type layer at the surface. This is done by placing the silicon wafer in a high-temperature tube furnace and (1) first growing a oxide layer with a high phosphorous concentration (using POCl3 as the phosphorous precursor) and (2) diffusing the phosphorus into the silicon wafer. This n-type layer is typically referred to as an emitter, a term which was taken from the bipolar transistor field. A correct term would be electron collector as is advocated by Cuevas et al. [1]. The phosphorus diffusion is one of the most critical steps in solar cell manufacturing. More information can be found on https://pv-manufacturing.org/solar-cell-manufacturing/tube-diffusion/

[1] A. Cuevas and D. Yan, “Misconceptions and Misnomers in Solar Cells”, IEEE Journal of Photovoltaics, vol. 3, pp. 916-923, 2013.

This video is an online educational resource developed for the https://pv-manufacturing.org/ website by Daniel Chen, Moonyong Kim, Huy Duc Dao and Jack Colwell in a project headed by Associate Professor Bram Hoex. The project funding was provided by the Australian Centre for Advanced Photovoltaics (ACAP) under Grant “CGR3 – Development of online educational resources for PV manufacturing education” and the Faculty of Engineering of UNSW Sydney.

More information about the A/Prof Bram Hoex’s research group
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Music:
“We are One” by Vexento
https://www.youtube.com/watch?v=2N4t_kChuiU

7 Comments

  1. John Ponce on March 30, 2021 at 11:37 pm

    what is the doping concentration

  2. Chris Baker on March 30, 2021 at 11:40 pm

    Visit https://order.universitywafer.com for all your silicon wafer needs!

    Have a tough question? DON’T WAIT! Ask us! Our engineers answer fast!

  3. Alex Marnellos on March 30, 2021 at 11:41 pm

    Plz get rid of music.

  4. 101perspective on March 30, 2021 at 11:57 pm

    "(1) first growing a oxide layer with a high phosphorous concentration (using POCl3 as the phosphorous precursor) and (2) diffusing the phosphorus into the silicon wafer. "

    Yeah, but HOW do you do that? Does that just naturally happen when you heat the silicon up and pump phosphorus gas into the chamber? Or is there more involved than that?

  5. ram malar on March 30, 2021 at 11:58 pm

    Reduce the background music sound dude

  6. Dont Reply on March 31, 2021 at 12:05 am

    Only vid ive found with a doping oven

  7. Miles Cheung on March 31, 2021 at 12:09 am

    The BGM sucks

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