Spiro-OMeTAD C81H68N4O8 - Chemical compound - CAS number:207739-72-8, Full name:2,2',7,7'-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene, OLED - noctiluca.eu

Name:

Spiro-OMeTAD

Formula:

C81H68N4O8

CAS number:

207739-72-8

MSDS

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General information

  • Name: Spiro-OMeTAD
  • Full name: 2,2',7,7'-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene
  • CAS number: 207739-72-8
  • Chemical formula: C81H68N4O8
  • Molecular weight: 1225.43 g/mol
  • Absorption: λmax = 306 nm, 385 nm in DCM
  • Photoluminescence: λmax = 429 nm in DCM
  • HOMO/LUMO: HOMO = -5.0 eV, LUMO = -2.1 eV
  • Synonyms: Spiro-MeOTAD, N2,N2,N2′,N2′,N7,N7,N7′,N7′-Octakis(4-methoxyphenyl)-9,9′-spirobi[9H-fluorene]-2,2′,7,7′-tetramine
  • Classification: Organic light-emitting diodes, White OLED materials, Perovskite-based photodiodes materials (PPD), Solid-state hole transport materials for DSSC, Solar cells
  • Purity: Sublimed: >99.5% (HPLC)
  • Melting point: >360 °C (0.5% weight loss)
  • Appearance: White to pale yellow powder

Spiro-OMeTAD: A Cornerstone in Organic Electronics

Spiro-OMeTAD, or 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene, is a groundbreaking material in the realm of organic electronics. Utilized primarily as a hole transport layer (HTL) material, Spiro-OMeTAD plays a crucial role in the efficiency and performance of various organic-inorganic electronic devices, including perovskite solar cells (PSCs), organic light-emitting diodes (OLEDs), and polymer-based organic solar cells (OSCs).

The Structure and Properties of Spiro-OMeTAD

Understanding the molecular structure of Spiro-OMeTAD is key to appreciating its functionality. With its spirobifluorene core, the compound exhibits excellent thermal stability and solubility in common organic solvents. Its high hole mobility and efficient charge transport properties make Spiro-OMeTAD an ideal choice for HTL applications.
Our Spiro-OMeTAD boasts a purity level of over 99.5% as confirmed by HPLC analysis, ensuring optimal performance in electronic devices.

Key Features of Spiro-OMeTAD

  • High Hole : Spiro-OMeTAD is renowned for its high hole mobility, a critical factor in enhancing the performance of hole transport layers in solar cells and OLEDs. This property ensures efficient charge transport, contributing to the overall device efficiency.
  • Superior Thermal : The robust thermal stability of Spiro-OMeTAD guarantees consistent performance under varying temperature conditions. This makes it an ideal material for devices requiring long-term stability and reliability.
  • Versatile Applications: Spiro-OMeTAD’s versatility extends beyond perovskite solar cells. It is also a crucial component in other organic electronic devices like OLEDs and organic field-effect transistors (OFETs), highlighting its broad applicability.
  • Effective Charge Transport: Spiro-OMeTAD exhibits excellent charge transport properties. This is vital for extracting and channeling positive charges in solar cells and OLEDs, thereby improving their efficiency and performance.

The Role of Spiro-OMeTAD in Advanced OLEDs

In the dynamic field of OLED technology, the pursuit of materials that enhance efficiency, longevity, and reduce energy consumption is critical. Spiro-OMeTAD stands out in this context with its unique molecular structure and hole transport properties. As a vital component in OLEDs, Spiro-OMeTAD plays a significant role in optimizing device performance and extending their lifespan. Its ability to efficiently transport holes and maintain stability under operational conditions aligns perfectly with the needs of advanced OLEDs. This ensures that OLED devices are not only more effective but also demonstrate improved durability and energy efficiency, marking a substantial contribution to the evolution of OLED technology.

Conclusion

Spiro-OMeTAD is more than just a chemical compound; it’s a key enabler in the field of organic electronics, paving the way for more efficient, stable, and high-performing devices. As we continue to explore its potential, Spiro-OMeTAD remains at the forefront of technological advancement in solar energy and OLED technology.

Frequently Asked Questions (FAQs)

What is Spiro-OMeTAD and what is it used for?

Spiro-OMeTAD is an organic chemical compound used as a hole transport material (HTM), particularly in perovskite solar cells, OLEDs, and other optoelectronic devices. It is characterized by high purity, stability, and excellent ability to conduct positive charge carriers.

What is the full chemical name of Spiro-OMeTAD?

Spiro-OMeTAD stands for 2,2′,7,7′-Tetrakis(N,N-di-p-methoxyphenylamino)-9,9′-spirobifluorene, a name that reflects its complex structure based on a fluorene core and donor groups.

What is the application of Spiro-OMeTAD in perovskite solar cells?

Spiro-OMeTAD functions as a hole transport layer (HTL), collecting positive charges from the active layer and transferring them to the electrode. This improves energy conversion efficiency and enhances device stability.

Why is Spiro-OMeTAD so popular in photovoltaic research?

Spiro-OMeTAD is valued for its high conductivity after doping, excellent energy level alignment, and wide availability, making it a standard reference material in photovoltaic laboratories.

Can Spiro-OMeTAD be used in OLEDs?

Yes, Spiro-OMeTAD is employed in OLEDs as a hole transport layer, which improves light emission efficiency and extends the operational lifetime of devices.

What is the purity of the Spiro-OMeTAD offered by Noctiluca?

Spiro-OMeTAD offered by Noctiluca has a purity >99.5%, making it suitable for use in advanced OLED structures and high-efficiency solar cells.

What are the optoelectronic properties of Spiro-OMeTAD?

Spiro-OMeTAD shows absorption maxima at 306 nm and 385 nm in dichloromethane (DCM). Its HOMO energy level is approximately -5.03 eV, enabling effective alignment with perovskites and light-emitting layers.

Does Spiro-OMeTAD require doping?

Yes. To achieve high conductivity, Spiro-OMeTAD is typically doped with compounds such as Li-TFSI, tBP, or FK209. These dopants significantly improve hole transport and enhance the overall energy efficiency of optoelectronic devices.

What are the limitations of Spiro-OMeTAD regarding long-term stability?

Spiro-OMeTAD is sensitive to moisture and oxygen, which can limit the lifetime of devices. Therefore, protective barriers and hermetic encapsulation are essential in final device structures.

Are there alternatives to Spiro-OMeTAD?

Yes, alternative hole transport materials such as PTAA, TCTA, or PEIE are under development. Nonetheless, Spiro-OMeTAD remains the most commonly used reference material in both academic and industrial contexts.

What is the molecular structure of Spiro-OMeTAD?

Spiro-OMeTAD is a spiro compound containing a central fluorene core with attached diphenylamine groups bearing methoxy substituents. This structure offers high rigidity and thermal stability.

What are the energy levels of Spiro-OMeTAD?

The HOMO level is around –5.03 eV, and the LUMO level is approximately –2.05 eV, making Spiro-OMeTAD compatible with a wide range of perovskite absorbers and cathodes.

In what form is Spiro-OMeTAD supplied?

Spiro-OMeTAD is provided as a light yellow powder that dissolves easily in typical organic solvents such as chlorobenzene, chloroform, and toluene.

Is Spiro-OMeTAD thermally stable?

Yes. Spiro-OMeTAD has a glass transition temperature (Tg) of 125°C, a melting point (Tm) of 248°C, and a decomposition temperature (Td) of 449°C, which qualifies it for thermal and vacuum processing techniques.

Can Spiro-OMeTAD be sublimed?

Yes, sublimed versions of Spiro-OMeTAD are available and suitable for vacuum deposition technologies, where high purity and layer thickness control are critical.

What are the storage requirements for Spiro-OMeTAD?

Spiro-OMeTAD should be stored in a dry, cool place, away from light and oxygen — ideally in an inert atmosphere (argon or nitrogen) — to prevent degradation.

Is Spiro-OMeTAD compatible with roll-to-roll technologies?

With suitable formulation, Spiro-OMeTAD can be used in printed HTM layers, making it a viable option for flexible and large-area electronics.

Is Spiro-OMeTAD safe to use?

Spiro-OMeTAD is relatively safe, but as with any laboratory-grade organic compound, it should be handled according to safety protocols — using gloves and working in a fume hood.

Can Spiro-OMeTAD be ordered in industrial quantities?

Yes. Spiro-OMeTAD is available from Noctiluca in both research-scale samples and industrial-scale packaging, depending on customer needs.

What are the main advantages of Spiro-OMeTAD?

Spiro-OMeTAD offers high purity, processability, favorable energy level alignment, and proven performance in perovskite technologies, making it one of the most reliable HTMs on the market.

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