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Product Code M2192B1-500mg
Price £210 ex. VAT

Spiro-TTB, HTL material in OLED, OPV and perovskite solar cells

Used to improve device performance

Overview | Specifications | Pricing and Options | MSDS | Literature and Reviews

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

Chemical structure of Spiro-TTB
Chemical structure of Spiro-TTB

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 light emitting device 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 light emitting device 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 light emitting device Red
Max. EQE 39.6%

*For chemical structure information, please refer to the cited references


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 MSDSSpiro-TTB MSDS sheet

Literature and Reviews

  1. 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.
  2. 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.
  3. 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.
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