Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.241
Publication date: 16th December 2024
The interest in lead halide perovskite materials has increased over the last decade. Understanding the fundamental photo-physical and chemical nature of these materials is of great interest as they have great potential in the application in solar cells or light emitting devices (LEDs). Therefore, lead halide perovskite nanocrystals (NCs) will be the most relevant material. Their optical tunability by anion exchange, high photoluminescence quantum yield and their defect tolerance make them outstanding. However, there is still lack of understanding the chemical nature surrounding the inorganic NC. Therefore, it is necessary to investigate how the electronic structure of this type of NCs can be influenced by the organics and, ultimately, the devices can be improved.
In this work, we investigate cinnamic acid covered CsPbBr3 NCs to study their absolute band edge position by spectroelectrochemistry (SEC). Kroupa et al. have previously a shift of the valence band of PbS nanoparticles by introducing electron withdrawing or donating functional groups to cinnamic acids.[1] Here, we can also observe a shift of the valence band. In contrast to PbS, electron withdrawing ligands facilitate the oxidation of NCs compared to electron donating ligands. A shift of 0.34 V can be extracted from SEC in photoluminescence. Combining this result with theory, the earlier oxidation can be explained by a shift of the HOMO to the cinnamic acid derivative. Depending on the strength of the electronic properties of the aromatic ligand, the HOMO is more or less located on the ligand, whereas this is not the case for PbS.[1] This result (of the easier oxidation of CACF3 covered NCs) is supported by data from LEDs. In particular, focusing on the hole transport layer gives insight into the charge injection depending on the ligand surrounding the NCs.
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.