High Purity Spiro-OMeTAD (Spiro-MeOTAD), 1g

2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spiro-bifluorene (Spiro-OMeTAD) has long been the prominent hole-transport material (HTM) in solid-state dye-sensitized solar cells (ssDSCs), ever since it provided a solid-state replacement to liquid electrolyte–based hole transporters. More recently, spiro-OMeTAD HTM has played a key role in the rapid rise of perovskite solar cells (PSCs), including recent major breakthroughs in solar-to-electric power conversion efficiencies, which now reach more than 20%. In addition to energy levels that match with those of the absorber and the electron-transport layer, spiro-OMeTAD provides remarkable glass-forming properties related to its spiro-center. It has a large band gap (about 3.0 eV) and a relatively deep-lying HOMO energy level, which laid the foundation for aligning well with perovskite layers. Its energy level structure is adjustable. It has a simple synthesis and solution process. The melting temperature of spiro-OMeTAD is high, which provides powerful support for the thermal stability of the device. These characteristics are favorable for large area fabrication of rigid and flexible solar cells.

Technical Data:

Product Name	2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spiro-bifluorene
Synonym	Spiro-OMeTAD Spiro-MeOTAD
SKU#	CM7007 (>99.8%) recrystallized CM7008 (>99.9%) resublimed
CAS Number	207739-72-8
MDL Number	MFCD12022511
Chemical Formula	C₈₁H₆₈N₄O₈
Molecular Weight	1225.43 g/mol
Purity	CM7007 (>99.8%) CM7008 (>99.9%)
Appearance	Faint Yellow Powder
Solubility	Soluble in DMSO, CB, Toluene et al.
UV absorption max	306,385 nm (in CH₂Cl₂)
PL max	429 nm (in CH₂Cl₂)
Eg (optical)	2.95 eV
HOMO/LUMO	HOMO=-5.0 eV (by cyclic voltammetry), LUMO=-2.05 eV (HOMO-Eg)
Melting Point	~240 °C
TGA	>360 °C (0.5% weight loss)
Packaging	1 g, or as required in glass bottle
Store	25 ℃ under N₂ atmosphere
Notes	HPLC & ¹HNMR spectra, user instruction for enquiring

References:

[1]: Spiro-OMeTAD single crystals: Remarkably enhanced charge-carrier transport via mesoscale ordering. Science advances 2, no. 4 (2016): e1501491.

[2]: Strategies of modifying spiro-OMeTAD materials for perovskite solar cells: a review. Journal of Materials Chemistry A 9, no. 8 (2021): 4589-4625.