Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.129
Publication date: 22nd December 2022
Understanding the spatial dynamics of nanoscale exciton energy transport beyond the temporal decay is at the core of photosynthesis and essential to provide a better framework for further improvements of nanostructured optoelectronic devices, such as solar cells. The diffusion coefficient (D) of photovoltaic films has so far only been determined indirectly, from transient singlet-singlet annihilation (SSA) experiments. Here, we present the full picture of the exciton distribution dynamics, adding the spatial domain to the temporal one, by spatio-temporally resolved photo-luminescence microscopy. In this way, we directly track diffusion and we are able to decouple the real spatial broadening from its overestimation given by SSA. We measured the diffusion coefficient, D = 0.017 ≈ 0.002 cm2/s, of the non-fullerene electron acceptor Y6, which combined with an exciton lifetime of τ = 840 ps, gives a Y6 film diffusion length of L = √ Dτ ≈ 35 nm. Thus, we provide an essential tool that enables a direct and free-of-artifacts determination of diffusion coefficients, which we expect to be at the core of further methodical studies on exciton dynamics in energy materials.
The authors acknowledge support through the MCIN/AEI projects PRE2019-091051, PGC2018- 096875-B-I00, the “Severo Ochoa” program for Centers of Excellence in R& D CEX2019- 000910-S, the Catalan AGAUR 2017SGR1369, Fundaci´o Privada Cellex, Fundaci´o Privada Mir-Puig, and the Generalitat de Catalunya through the CERCA program. L.B. received funding from the Clean Planet Program supported by Fundaci´o Joan Ribas Araquistain (FJRA). N.F.v.H. acknowledges the financial support by the European Commission (ERC Advanced Grant 670949-LightNet). J.M. and F.B. acknowledge the financial support by the European Commission (951843), Spanish MINECO (MAT2017-89522-R) and MCIN/AEI (PRE2018-084881). This work was partially funded by Ministerio de Ciencia e Innovaci´on (grant No. PID2020-112650RB-I00)
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.