Spiro-TTB
All Semiconducting Molecules, Perovskite Interface Materials, Sublimed Materials, Transport Layer Materials
Spiro-TTB, HTL material in OLED, OPV and perovskite solar cells
Used to improve device performance
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.
General Information
| 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. |
Product Details
| Purity | Unsublimed > 98% (1H NMR) |
|---|---|
| Melting point | Tg = 146 °C |
| Appearance | Light yellow powder/crystals |
Chemical Structure
Device Structure(s)
| Device structure | ITO (90 nm)/Spiro-TTB:F6-TCNNQ (4 wt.%, 10 nm)/NPB (20 nm)/NPB:Ir(MDQ)2acac (10 wt.%, 10 nm)/BAlq (65 nm)/BPhen:Cs (100 nm) [2] |
|---|---|
| Colour |
 Red |
| Max. Power Efficiency | 33.3 lm W−1 |
| Max. Current Efficiency | 27.7 cd/A |
| Max. EQE | 19.5% |
| Device structure | ITO (90 nm)/Spiro-TTB:F6-TCNNQ (4 wt.%, 10 nm)/NPB (20 nm)/TCTA:Ir(ppy)2acac (8 nm)/TPBi:Ir(ppy)2acac (12 nm)/BAlq (50 nm)/BPhen:Cs (100 nm) [2] |
|---|---|
| Colour |
 Green |
| Max. Power Efficiency | 77.0 lm W−1 |
| Max. Current Efficiency | 54.4 cd/A |
| Max. EQE | 19.7% |
| Device structure | ITO/NPB (75 nm)MoO3 (2 nm)/Au (2 nm)/Ag (6 nm)/Spiro-TTB:F6-TCNNQ (2 wt.%, 10 nm)/NPB (10 nm)/NPB:Ir(MDQ)2acac (10 wt.%, 20 nm)/BAlq (10 nm)/BPhen:Cs (85 nm)/Ag (100 nm) [3] |
|---|---|
| Colour |
Red |
| Max. EQE | 39.6% |
*For chemical structure information, please refer to the cited references
Pricing
| Grade | Order Code | Quantity | Price |
|---|---|---|---|
| Unsublimed (>98% purity) | M2192B1 | 500 mg | £210 |
| Unsublimed (>98% purity) | M2192B1 | 1 g | £350 |
| Unsublimed (>98% purity) | M2192B1 | 5 g | £1450 |
MSDS Documentation
Spiro-TTB MSDS sheetLiterature and Reviews
- Minimal Effect of the Hole-Transport Material Ionization Potential on the Open-Circuit Voltage of Perovskite Solar Cells, R. Belisle et al., ACS Energy Lett., 1, 556−560 (2016); DOI: 10.1021/acsenergylett.6b00270.
- Alternative p-doped hole transport material for low operating voltage and high efficiency organic light-emitting diodes, C. Murawski et al, Appl. Phys. Lett. 105, 113303 (2014); doi: 10.1063/1.4896127.
- Coupled Optical Modeling for Optimization of Organic Light-Emitting Diodes with External Outcoupling Structures, M. Kovačič et al., ACS Photonics 2018, 5, 422−430 (2018); DOI: 10.1021/acsphotonics.7b00874.
- Comparison of Charge-Carrier Transport in Thin Films of Spiro-Linked Compounds and Their Corresponding Parent Compounds, T. Saragi et al., Adv. Funct. Mater., 16, 966–974 (2006); DOI: 10.1002/adfm.200500361.
To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, military, pharmaceuticals, cosmetics, food, or commercial applications.