Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO25)
Publication date: 24th April 2025
The application of self-assembled molecules (SAMs) as selective contacts has rocketed during the last four years especially in solar cells due to the impressive enhancement in efficiency and the stability achieved in the devices containing SAMs. These SAMs are molecules of low molecular weight made of an anchoring group that form a covalent bond with the substrate, a linker that influences the molecular packing and ensures the conductivity through the molecule and the terminal group. This terminal group is in direct contact with the photoactive layer determining its packing and crystallization, also affecting the properties at the interface. Therefore, the composition of SAMs deeply influences the interfacial charge dynamics on the device under operational conditions which reflects in the performance and stability. Moreover, SAMs form ultrathin layers. This means that the transmittance of the substrate does not vary significantly upon the addition of a SAM and that the amount of required material is low. In combination with the fact that SAMs can be deposited by dip coating or spin coating, the potential cost of the production of the devices can be lowered. For these reasons, SAMs are an excellent alternative to the traditional hole transport materials such as PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) or PTAA (poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine), whose instability under operational conditions or its inherent acidity compromises the device stability.
Nanocrystals, based on metal halide perovskites have demonstrated their potential as light sources when forming part of efficient light emitting diodes (LEDs). However, operational stability and efficiency are hindered by unstable charge transport layers, with reduced charge mobility and/or poor solvent resistance. In this work, we report the application of two self-assembled molecules (SAMs) as hole transport materials. The structure of the two SAMs, based on the carbazole core, differs in one phenyl ring in the linker; however, the extra ring provides more stability to the devices, even surpassing the one obtained with the widely used polymer PTAA. In addition, due to the structural and electronic characteristics of the SAMs, the efficiency of the devices is also increased.
This work is partially funded by the Ministerio de Ciencia e Innovación of the Spanish government by the project CNS2022-135483-MCIN/AEI/10.13039/501100011033
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.