CAS Number 515834-67-0
Spiro-TTB has a spirofluorene core with four attached ditolylamine at the 2 and 7 positions of spirofluorene. Like Spiro-OMeTAD, it is electron-rich and commonly used as a hole-transport layer material in OLED, OPV, and perovskite solar cells.
Compared to Spiro-OMeTAD, Spiro-TTB is less electron-rich, with four methoxyl groups being replaced by four methyl groups. It has a deeper HOMO energy level, which gives greater VOC, thus, better device performance can be expected.
| CAS number | 515834-67-0 |
|---|---|
| Full name | 2,2',7,7'-Tetra(N,N-di-p-tolyl)amino-9,9-spirobifluorene |
| Chemical formula | C81H68N4 |
| Molecular weight | 1097.43 g/mol |
| Absorption | λmax 384 nm in DCM |
| Fluorescence | λmax 413 nm in DCM |
| HOMO/LUMO | HOMO = 5.25 eV [1] |
| Classification / Family | Spirofluorene derivative, Hole transport layer materials, Perovskite solar cells, Organic electronics. |
| Purity | Unsublimed > 98% (1H NMR) |
|---|---|
| Melting point | Tg = 146 °C |
| Appearance | Light yellow powder/crystals |
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