A5029238494- Perovskite Materials and Applications
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Advanced Nanomaterials in Catalysis
- Polyoxometalates: Synthesis and Applications
- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Electrochemical Analysis and Applications
- Porphyrin and Phthalocyanine Chemistry
- Metal complexes synthesis and properties
- Analytical Chemistry and Sensors
- Transition Metal Oxide Nanomaterials
- Ionic liquids properties and applications
- Electrochemical sensors and biosensors
- Organic and Molecular Conductors Research
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- CO2 Reduction Techniques and Catalysts
- Advanced battery technologies research
- 2D Materials and Applications
- Electrocatalysts for Energy Conversion
École Polytechnique Fédérale de Lausanne
2016-2025
Fraunhofer Institute for Solar Energy Systems
2022
Abdelmalek Essaâdi University
2022
University of Freiburg
2022
Charles Humbert 8
2014-2021
University of Lausanne
2015-2020
Robert Bosch (Germany)
2020
Interface (United States)
2010-2019
Photonics (United States)
2015-2019
King Abdulaziz University
2015-2016
Simultaneous modification of the dye and redox shuttle boosts efficiency a dye-sensitized solar cell.
Today's best perovskite solar cells use a mixture of formamidinium and methylammonium as the monovalent cations. With addition inorganic cesium, resulting triple cation compositions are thermally more stable, contain less phase impurities sensitive to processing conditions. This enables reproducible device performances reach stabilized power output 21.1% ∼18% after 250 hours under operational These properties key for industrialization photovoltaics.
Improving the stability of perovskite solar cells Inorganic-organic have poor long-term because ultraviolet light and humidity degrade these materials. Bella et al. show that coating with a water-proof fluorinated polymer contains pigments to absorb re-emit it in visible range can boost cell efficiency limit photodegradation. The performance inorganic-organic are also limited by size cations required for forming correct lattice. Saliba rubidium cation, which is too small form itself, lattice...
A new series of panchromatic ruthenium(II) sensitizers derived from carboxylated terpyridyl complexes tris-thiocyanato Ru(II) have been developed. Black dye containing different degrees protonation [(C(2)H(5))(3)NH][Ru(H(3)tcterpy)(NCS)(3)] 1, [(C(4)H(9))(4)N](2)[Ru(H(2)tcterpy)(NCS)(3)] 2, [(C(4)H(9))(4)N](3)[Ru(Htcterpy)(NCS)(3)] 3, and [(C(4)H(9))(4)N](4)[Ru(tcterpy)(NCS)(3)] 4 (tcterpy = 4,4',4' '-tricarboxy-2,2':6',2' '-terpyridine) synthesized fully characterized by UV-vis, emission,...
Metal halide perovskite solar cells (PSCs) currently attract enormous research interest because of their high solar-to-electric power conversion efficiency (PCE) and low fabrication costs, but practical development is hampered by difficulties in achieving performance with large-size devices. We devised a simple vacuum flash–assisted solution processing method to obtain shiny, smooth, crystalline films electronic quality over large areas. This enabled us fabricate an aperture area exceeding 1...
Researchers developed a perovskite solar cell with high power-conversion efficiency (>20%) and intense electroluminescence yield (0.5%).
Perovskite solar cells (PSCs) with efficiencies greater than 20% have been realized only expensive organic hole-transporting materials. We demonstrate PSCs that achieve stabilized exceeding copper(I) thiocyanate (CuSCN) as the hole extraction layer. A fast solvent removal method enabled creation of compact, highly conformal CuSCN layers facilitate rapid carrier and collection. The showed high thermal stability under long-term heating, although their operational was poor. This instability...
We report two new heteroleptic polypyridyl ruthenium complexes, coded C101 and C102, with high molar extinction coefficients by extending the pi-conjugation of spectator ligands, a motivation to enhance optical absorptivity mesoporous titania film charge collection yield in dye-sensitized solar cell. On basis this sensitizer, several DSC benchmarks measured under air mass 1.5 global sunlight have been reached. Along an acetonitrile-based electrolyte, sensitizer has already achieved...
A high molar extinction coefficient heteroleptic ruthenium complex, incorporating an electron-rich hexylthio-terminal chain, has been synthesized and demonstrated as efficient sensitizer for dye-sensitized solar cells. With this new excellent power conversion efficiency is 11.5% 4.7% obtained under irradiation of full sunlight (air mass 1.5 global) in combination with a volatility electrolyte solid state hole transporting material, respectively. The devices low showed good stability...
Ionic displacement modifying the electric field in device is found as most likely reason for hysteresis which examined by separating fast and slow processes comparing devices with without blocking layer.
Planar perovskite solar cells exhibit a conduction band misalignment of the with TiO<sub>2</sub>, but not SnO<sub>2</sub>. The system using latter yielded power conversion efficiencies over 18%.
Abstract Improving the long-term stability of perovskite solar cells is critical to deployment this technology. Despite great emphasis laid on stability-related investigations, publications lack consistency in experimental procedures and parameters reported. It therefore challenging reproduce compare results thereby develop a deep understanding degradation mechanisms. Here, we report consensus between researchers field for testing cell stability, which are based International Summit Organic...
A mixture of CsPbI<sub>3</sub> and FAPbI<sub>3</sub> is thermodynamically stabilized in the perovskite phase with respect to pure δ phases.
Improvements to perovskite solar cells (PSCs) have focused on increasing their power conversion efficiency (PCE) and operational stability maintaining high performance upon scale-up module sizes. We report that replacing the commonly used mesoporous–titanium dioxide electron transport layer (ETL) with a thin of polyacrylic acid–stabilized tin(IV) oxide quantum dots (paa-QD-SnO 2 ) compact–titanium enhanced light capture largely suppressed nonradiative recombination at ETL–perovskite...
The ruthenium complexes [Ru(dcbpyH2)2(Cl)2] (1), [Ru(dcbpyH2)2(NCS)2] (2), (Bu4N)4[Ru(dcbpy)2(NCS)2] (3), and (Bu4N)2[Ru(dcbpyH)2(NCS)2] (4) were synthesized characterized by cyclic voltammetry, UV−vis absorption, emission, IR, Raman, NMR spectroscopy. absorption emission maxima of these red shifted with decreasing pH, showed pH-dependent excited-state lifetimes. ground-state pKa values determined spectrophotometeric methods, the dissociation protons was found to occur in two steps (pKa = 3...
A mesoscopic bilayer TiO2 film used as an electron collector in conjunction with acetonitrile- or ionic liquid-based electrolyte greatly improves the performance of dye-sensitized solar cells (see figure). The thickness nanocrystalline affects photovoltaic characteristics, particularly for ionic-liquid-based electrolyte, owing to a limitation photocurrent by diffusion I3– ions.
For the first time silica nanoparticles were used to solidify ionic liquids. These liquid-based quasi-solid-state electrolytes successfully employed for regenerative photoelectrochemical cells that yielded 7% efficiency at AM 1.5 sunlight in combination with an amphiphilic ruthenium polypyridyl photosensitizer.
In this work, we study the characteristics of dye-sensitized solar cells using an ionic liquid as electrolyte and compare them with response a solvent-containing cell. Impedance spectroscopy is used to derive key circuit elements determining photovoltaic performance On basis data, photocurrent voltage curves are calculated compared experimental results.
We report an efficient nonplatinized flexible counter electrode for dye-sensitized solar cells. In combination with a solvent-free ionic liquid electrolyte, we have demonstrated ∼6.5% cell amphiphilic ruthenium polypyridyl photosensitizer showing excellent stability measured under prolonged light soaking at 60 °C. Compared to the Pt deposited PEN film, CoS film shows higher electrocatalytic activity reduction of triiodide. This is expected important practical consequence on production...
Abstract Perovskite solar cells are one of the most promising photovoltaic technologies with their extraordinary progress in efficiency and simple processes required to produce them. However, frequent presence a pronounced hysteresis current voltage characteristic these devices arises concerns on intrinsic stability organo-metal halides, challenging reliability technology itself. Here, we show that n-doping mesoporous TiO 2 is accomplished by facile post treatment films lithium salts. We...