DOI: https://doi.org/10.29363/nanoge.almips.2021.005
Publication date: 23rd September 2021
Self-assembled monolayers as hole-transporting materials for increasing the performance of Perovskite CsPbBr3 Quantum Dot Light Emitting Diodes
S. Kumari* , E. Martinez-Ferrero and E. Palomares
Institut Catala d'investigacio Química (ICIQ), Tarragona-43007 Spain
* skumari@iciq.es
Abstract: PEDOT:PSS is one of the most commonly used hole transport material in optoelectronic devices due to its noble behavior like quality film making capability, thermal stability and high conductivity. However, due to its hygroscopic and acidic nature, PEDOT: PSS strongly compromises the stability of the devices. In the same field, other commonly used alternative for HTM is PTAA which being very expensive makes its application less benefitting. Therefore, we need to find an alternative for these popular and solution-processed materials. Self-assembled monolayers (SAMs) formed by organic molecules are an interesting alternative for common hole transport materials (HTMs). The assembly of the molecules results in films of less than 5 nm that are enough to modify the physicochemical properties of the anode, like the wettability and the work function. SAMs have a definite dipole moment which can shift the work function of anode by forming covalent bonds at the interface. Its low cost, less material usage, and the ease of tuning the molecular structure make SAMs attractive for HTM when compared with PEDOT: PSS/PTAA assembly.
In the present work, we report our results of quantum dot light emitting diodes (QDLEDs) prepared with two carbazole-based molecules, EADR03 and EADR04, as self-assembled monolayers as HTM in the Perovskite CsPbBr3 -based QDLEDs. We have studied the device performance of the QDLEDs with SAM molecules and compared with the reference devices containing PEDOT:PSS/PTAA and PTAA. The luminance from the devices with EADR04 and EADR03 HTL has increased, when compared with PEDOT:PSS/PTAA and PTAA devices. Interestingly, lifetime of the devices at constant applied bias has also increased.
The new thin HTLs based on SAM molecules can open a new pathway for LEDs industries, due to its ease of processing and thin-size devices possibilities.
Keywords: SAMs, Perovskite, Quantum dots, Light emission, Materials
References:
E. Aktas, E Phung et al, Energy Environ. Sci., 2021,14, 3976-3985
E. Yalçin et al, Energy Environ. Sci., 2019, 12, 230-237
Leimeng Xu et al, Nature Communications , 2020, 11, 1-12
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