Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
The combination of functional scanning probe microscopy with advanced signal processing techniques in recent years has enabled new discoveries in a wide range of energy materials. These “big data” methods merge the availability of affordable data storage with the advances of the broader data science community to extract hidden information from gigabytes of raw time-dependent cantilever response data. In this talk, we will discuss our work using data-driven scanning probe methods, in particular time-resolved electrostatic force microscopy, for analyzing mixed organic-inorganic halide perovskites in situ in response to illumination. Through signal processing of the raw cantilever deflection signal during photoinduced charging, it is possible to extract the photoresponse of materials at microsecond timescales via analysis of the instantaneous frequency or the reconstructed electrostatic force. Importantly, we show that in layered (n=1) perovskites it is possible to observe photovoltage dynamics with timescales comparable to ion motion or trap-mediated carrier motion, in contrast to device-level studies. Furthermore, these timescales exhibit strong spatial dependence, with grain centers showing faster response compared to grain boundaries. This result is confirmed by general mode scanning Kelvin probe microscopy as well as by unsupervised clustering methods like k-means. These data indicate that layered perovskite materials may be more defect-prone than previously thought. Lastly, we discuss our work on analysis of hyperspectral photoinduced force microscopy for studying the spatial distribution of components in layered perovskites.
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.