Spiro OMeTAD solution made for Perovskite solar cells are turning red in color when taken inside a glove box or when they are stirred excessively. Can anyone please let me know the mechanism involved?
When Spiro-OMeTAD is dissolved, it has whitish color. After adding very small amounts of dopants (LiTFSI and tBP), the color usually turns yellowish. Please check the amounts of dopants.
The red colour is the oxidised spiro forming; it forms by reacting with Li-TFSI normally in the presence of oxygen. It shouldn't really go red inside a glovebox, since there's no oxygen!
Thanks so much giles. And yeah i goes deep red in dry box and Glove box slightly pinkish probably since the lithium TFSI was stored in ambient for a while. I saw the study recently, made by Prof. snaith on this probably published in 2009 i guess.
Thank you so much once again. Will make sure to make necessary storage conditions.
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