Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.268
Publication date: 18th July 2019
Upconversion of low-energy photons transmitted by traditional single-threshold solar cells is a promising approach to overcome their theoretical efficiency limit. Due to their relatively high-energy absorption threshold dye-sensitized and organic solar cells have a particular high loss of low-energy photons and consequently a high potential for improvement by photon upconversion.
We have investigated photon upconversion via triplet fusion on dye-sensitized nanostructured metal oxides [1], which has been applied in the first examples of intermediate band dye-sensitised solar cells [2]. More recently we applied photon upconversion via triplet fusion in organic molecules tailored to improve the efficiency of organic solar cells. This approach can be synthetically tuned to match the spectral requirements of the solar cell technology. In addition, molecular photon upconversion benefits from spin-allowed broadband absorbing transitions, which facilitates reasonable upconversion efficiency under solar flux [1].
Specifically, we investigate in this work solid-state systems based on palladium(II) 1,4,8,11,15,18,22,25-octabutoxyphthalocyanine as a triplet sensitizer and rubrene as a triplet-triplet annihilator. This upconverter was first demonstrated by Singh-Rachford and Castellano in solution and solid polymer films [3]. After light absorption (735 nm) and intersystem crossing in the triplet sensitizer, the resulting triplet state is transferred to rubrene. Following triplet energy migration, two rubrene triplet states can annihilate (triplet fusion) to produce a high-energy singlet state, which decays by emission of an (upconverted) high-energy photon (573 nm). New results focusing on the integration of this system in organic solar cell devices will be discussed.
To further boost the photon upconversion efficiency, metal nanostructures tailored for plasmon resonance at the absorption band of the upconverter are integrated, using new guidelines for nano-particle design optimization demonstrated in lanthanide based photon upconverters (Madsen, S. P. et al., J. Phys. D: Appl. Phys. 2019, submitted). Combined, this work thus addresses new routes for integration of molecular upconverter systems in organic solar cell devices.
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.