Digital Printing of Titanium Dioxide for Dye Sensitized Solar Cells

An Open Access Protocol from JoVE - Engineering.
www.jove.com/video/53963/digit...
This paper investigates the suitability of inkjet printing for the manufacturing of dye-sensitized solar cells. A binder-free TiO2 nanoparticle ink was formulated and printed onto a FTO glass substrate. The printed layer was fabricated into a cell with an active area of 0.25 cm2 and an efficiency of 3.5%.
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[@god2sIgnorance]

what is the use of the light process at 4:26? thx