Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
Metal halide perovskites (MHPs) have gained significant interest as photovoltaic materials due to their impressive optoelectronic properties: high absorption coefficient, tunable bandgap and long charge carrier lifetimes. The power conversion efficiency has dramatically increased from 3.8% to over 25% [1] over the past few years. However, the main challenge for application is the long-term stability under operating conditions.
This issue is mitigated in two-dimensional (2D) lead-halide perovskites. Instead of the commonly used small cations such as methylammonium in the 3D analogues, the 2D perovskites consist of inorganic octahedral lead-halide layers separated by large organic cations. However, here the electrons and holes are spatially confined to the conducting inorganic layer, leading to detrimental quantum confinement effects. By increasing the inorganic layer thickness in between the large organic cations, quasi-2D structures are formed, the so-called Ruddlesden-Popper or Dion-Jacobson phases. In this way, high efficiency and stability properties are combined [2].
The mechanistic understanding of the relation between the MHP microstructure and the optoelectronic properties is still in an early stage. We aim to explore the photodynamics of quasi-2D perovskite layers with various microstructures, by time-resolved photoluminescence spectroscopy (TRPL) and ultrafast transient absorption (TA). While TRPL only detects emissive processes, TA is also capable of probing non-emissive excited-state processes in a femtosecond-nanosecond time window, such as hot carrier cooling, excited state processes, charge transport etc. This provides unique insights into the band structure and the photodynamical processes of the films, and can be used to further improve these materials.
We use these techniques to study micropatterned perovskite films with mm sized structures. According to previous work of Kamminga et. al., the patterning process improves the overall crystallization of the perovskite film and increases the grain sizes compared to nonpatterned films [3]. Hence, the optoelectronic properties can be expected to improve as well. We explore, for the first time, the effects of micropatterning on the photodynamics of quasi-2D perovskite films.
We thank the NWO TTW program for funding our project (17711). We also thank the user committee associated with this project, consisting of Solliance, Fraunhofer Institute for Solar Energy Systems ISE, Morphotonics and Domicro, for their support and stimulating scientific discussions.
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.