Spiro-OMeTAD, also known as Spiro-MeOTAD (CAS 207739-72-8), is a spirobifluorene-based hole transport layer (HTL) material and one of the most widely studied options for organic-inorganic electronic devices. Product code M292 is the sublimed grade, with a purity above 99.5% by HPLC. Sublimation is used to produce ultra-pure chemicals.
Its spiro-linked structure gives the molecule a high glass transition temperature and good morphological stability, while keeping it easy to process and preserving useful electronic properties. The HOMO sits at -5.0 eV and the LUMO at -2.05 eV, with an optical band gap of 2.95 eV. The material is a white to pale yellow powder with a melting point of approximately 240 °C and shows 0.5% weight loss above 360 °C by TGA.
Researchers use Spiro-OMeTAD in perovskite solar cells, solid-state dye-sensitized solar cells, OLEDs and polymer-based organic solar cells. A common processing route spin-coats it from chlorobenzene with dopants such as 4-tert-butylpyridine, LiTFSI and a cobalt(III) complex.
- Hole transport layer in perovskite solar cells (PSCs).
- Hole transporting material in solid-state dye-sensitized solar cells (ssDSSC).
- Charge transport layer in organic light-emitting diodes (OLEDs).
- Hole transport layer in polymer-based organic solar cells (OSCs).
- Spin-coated doped HTL films prepared from chlorobenzene solution with LiTFSI, 4-tert-butylpyridine and Co(III) complex additives.
| Brand | Ossila |
|---|---|
| CAS number | 207739-72-8 |
| Molecular formula | C81H68N4O8 |
| Purity | Sublimed: >99.5% (HPLC) |
| Category | — |
| Pack sizes | 500 mg, 1 g, 5 g, 10 g |
| Physical form | White to pale yellow powder |
| Storage | — |
- Product code: M292
- Full Name: 2,2',7,7'-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene
- Synonyms: Spiro-OMeTAD, Spiro-MeOTAD
- Molecular Weight: 1225.43 g/mol
- UV Absorption Max: 306 nm, 385 nm (in CH2Cl2)
- PL Max: 429 nm (in CH2Cl2)
- HOMO / LUMO: HOMO = -5.0 eV, LUMO = -2.05 eV (HOMO - Eg)
- Optical Band Gap (Eg): 2.95 eV
- Melting Point: 240 °C (approx.)
- TGA: >360 °C (0.5% weight loss)
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