How do you usually clean spiro-OMeTAD before using in solar cell devices from moisture or other impurities that might dramatically affect the device performances.
Popular way to purify spiro-OMeTAD is to perform column chromatography followed by recrystallization.
For some details see an article of Nam Joong Jeon et al.:
"o-Methoxy Substituents in Spiro-OMeTAD for Efficient Inorganic–Organic Hybrid Perovskite Solar Cells"
available at:
http://cdn-pubs.acs.org/doi/suppl/10.1021/ja502824c
with free access supplementary information here:
http://cdn-pubs.acs.org/doi/suppl/10.1021/ja502824c/suppl_file/ja502824c_si_001.pdf
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