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Surface coatings based on polysilsesquioxanes: solution-processible smooth hole-injection layers for optoelectronic
Daniel Kessler1, Maria C Lechmann, Seunguk Noh
1Institute of Organic Chemistry, Johannes Gutenberg University, Mainz, Duesbergweg 10-14, 55099 Mainz, Germany; Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Macromolecular Rapid Communications
|June 4, 2011
Summary
Poly(methylsilsesquioxane)-poly(N,N-di-4-methylphenylamino styrene) (PMSSQ-PTPA) effectively planarizes anode interfaces in optoelectronic devices. This material demonstrates excellent hole injection capability and film stability for multilayer applications.
Area of Science:
- Materials Science
- Organic Electronics
- Device Physics
Background:
- Optoelectronic devices commonly utilize transparent conductive oxides (TCOs) as electrodes.
- Interfacial engineering between TCOs and organic layers is crucial for optimizing device performance.
- Developing novel materials for hole-injection layers (HILs) is essential for advancing organic electronics.
Purpose of the Study:
- To introduce poly(methylsilsesquioxane)-poly(N,N-di-4-methylphenylamino styrene) (PMSSQ-PTPA) as a novel material for hole-injection layers.
- To investigate the interfacial properties and performance of PMSSQ-PTPA films in optoelectronic devices.
- To demonstrate the potential of PMSSQ-PTPA for enhancing device stability and enabling multilayer fabrication.
Main Methods:
- Spin-coating deposition of PMSSQ-PTPA films on indium tin oxide (ITO) substrates.
- Thermally induced crosslinking to form a stable HIL.
- Cyclovoltammetry and time-of-flight measurements to determine HOMO level and hole mobility.
- Contact angle measurements and tape tests to assess film adhesion and solvent resistance.
Main Results:
- PMSSQ-PTPA films effectively planarized the anode interface.
- Measured HOMO level of -5.6 eV and hole mobility of 1 × 10⁻⁶ cm²/Vs confirmed hole injection capability.
- Demonstrated excellent adhesion and stability of the PMSSQ-PTPA layer under solvent treatments.
- The material proved suitable for subsequent multilayer device construction.
Conclusions:
- PMSSQ-PTPA is a promising material for hole-injection layers in optoelectronic devices.
- Its ability to planarize interfaces, facilitate hole injection, and provide robust stability makes it valuable for advanced device architectures.
- This work contributes to the development of high-performance and stable organic electronic devices through effective interfacial engineering.
