A5064603086- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- TiO2 Photocatalysis and Solar Cells
- Spectroscopy and Laser Applications
- Advanced Photocatalysis Techniques
- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Solid-state spectroscopy and crystallography
- Semiconductor Quantum Structures and Devices
- Laser-Matter Interactions and Applications
- Spectroscopy and Quantum Chemical Studies
- Advanced Fiber Laser Technologies
- 2D Materials and Applications
- Semiconductor Lasers and Optical Devices
- Terahertz technology and applications
- Polyoxometalates: Synthesis and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organic and Molecular Conductors Research
- Laser Design and Applications
- Luminescence Properties of Advanced Materials
- Advanced Nanomaterials in Catalysis
- Quantum and electron transport phenomena
École Polytechnique Fédérale de Lausanne
2020-2025
Interface (United Kingdom)
2025
Photonics (United States)
2025
Clean Energy (United States)
2017-2018
University of Washington
2017-2018
BASF (Germany)
2008-2009
Robert Bosch (Germany)
2009
Uppsala University
2009
Max Planck Institute for Polymer Research
2007-2008
KTH Royal Institute of Technology
2007
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...
Moving a perovskite into the black The bandgap of α-phase FAPbI 3 (where FA is formamidinium) nearly ideal for solar cells, but it unstable with respect to photoinactive yellow δ-phase. Lu et al. found that film phase was converted highly crystalline by vapor exposure methylammonium thiocyanate at 100°C, and retained this structure after 500 hours 85°C. Solar cells fabricated material had power conversion efficiency more than 23%. After under maximum tracking period dark recovery, 94%...
Passivation of interfacial defects serves as an effective means to realize highly efficient and stable perovskite solar cells (PSCs). However, most molecular modulators currently used mitigate such form poorly conductive aggregates at the interface with charge collection layer, impeding extraction photogenerated carriers. Here, a judiciously engineered passivator, 4-tert-butyl-benzylammonium iodide (tBBAI), is introduced, whose bulky tert-butyl groups prevent unwanted aggregation by steric...
Abstract To develop photosensitizers with high open-circuit photovoltage ( V oc ) is a crucial strategy to enhance the power conversion efficiency (PCE) of co-sensitized solar cells. Here, we show judiciously tailored organic photosensitizer, coded MS5, featuring bulky donor N -(2’,4’-bis(dodecyloxy)-[1,1’-biphenyl]-4-yl)-2’,4’-bis(dodecyloxy)- -phenyl-[1,1’-biphenyl]-4-amine and electron acceptor 4-(benzo[ c ][1,2,5]thiadiazol-4-yl)benzoic acid. Employing MS5 copper (II/I) electrolyte...
Perovskite solar cells (PSCs) consisting of interfacial two- and three-dimensional heterostructures that incorporate ammonium ligand intercalation have enabled rapid progress toward the goal uniting performance with stability. However, as field continues to seek ever-higher durability, additional tools avoid progressive are needed minimize degradation at high temperatures. We used ligands nonreactive bulk perovskites investigated a library varies molecular structure systematically. found...
As a result of their attractive optoelectronic properties, metal halide APbI3 perovskites employing formamidinium (FA+ ) as the A cation are focus research. The superior chemical and thermal stability FA+ cations makes α-FAPbI3 more suitable for solar-cell applications than methylammonium lead iodide (MAPbI3 ). However, its spontaneous conversion into yellow non-perovskite phase (δ-FAPbI3 under ambient conditions poses serious challenge practical applications. Herein, we report on...
A myriad of studies and strategies have already been devoted to improving the stability perovskite films; however, role different crystal facets in is still unknown. Here, we reveal underlying mechanisms facet-dependent degradation formamidinium lead iodide (FAPbI3) films. We show that (100) facet substantially more vulnerable moisture-induced than (111) facet. With combined experimental theoretical studies, are revealed; a strong water adhesion following an elongated lead-iodine (Pb-I) bond...
The use of molecular modulators to reduce the defect density at surface and grain boundaries perovskite materials has been demonstrated be an effective approach enhance photovoltaic performance device stability solar cells. Herein, we employ crown ethers modulate films, affording passivation undercoordinated defects. This interaction elucidated by solid-state nuclear magnetic resonance functional theory calculations. ether hosts induce formation host-guest complexes on which reduces...
Long-term durability is critically important for the commercialization of perovskite solar cells (PSCs). The ionic character and hydrophilicity commonly used additives hole-transporting layer (HTL), such as lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) tert-butylpyridine (tBP), render PSCs prone to moisture attack, compromising their long-term stability. Here we introduce a trifluoromethylation strategy overcome this drawback boost PSC's electric power conversion efficiency (PCE). We...
Abstract Perovskite solar cells have reached a power conversion efficiency over 25%, and the engineering of interface between perovskite hole transport layer (HTL) has been crucial to achieve high performance. Here we design bifunctional molecule CBz-PAI with carbazole-triphenylamine phenylammonium iodide units passivate defects at perovskite/HTL interface. Owing favourable energy level alignment perovskite, acts as shuttle HTL. This minimizes difference quasi-Fermi splitting or ‘internal’ V...
High-quality perovskite light harvesters and robust organic hole extraction layers are essential for achieving high-performing solar cells (PSCs). We introduce a phosphonic acid-functionalized fullerene derivative in mixed-cation perovskites as grain boundary modulator to consolidate the crystal structure, which enhances tolerance of film against illumination, heat, moisture. also developed redox-active radical polymer, poly(oxoammonium salt), that can effectively p-dope hole-transporting...
Abstract Formamidinium lead iodide perovskites are promising light-harvesting materials, yet stabilizing them under operating conditions without compromising optimal optoelectronic properties remains challenging. We report a multimodal host–guest complexation strategy to overcome this challenge using crown ether, dibenzo-21-crown-7, which acts as vehicle that assembles at the interface and delivers Cs + ions into interior while modulating material. This provides local gradient of doping...
There exists a considerable density of interaggregate grain boundaries (GBs) and intra-aggregate GBs in polycrystalline perovskites. Mitigation is equally notable to that as can also cause detrimental effects on the photovoltaic performances perovskite solar cells (PSCs). Here, we demonstrate full-scale GB mitigation ranging from nanoscale submicron-scale GBs, by modulating crystallization kinetics using judiciously designed brominated arylamine trimer. The optimized GB-mitigated films...
The defects located at the interfaces and grain boundaries (GBs) of perovskite films are detrimental to photovoltaic performance stability solar cells. Manipulating crystallization process tailoring with molecular passivators main effective strategies mitigate loss instability. Herein, a new strategy is reported manipulate FAPbI3 -rich by incorporating small amount alkali-functionalized polymers into antisolvent solution. synergic effects alkali cations poly(acrylic acid) anion effectively...
Five novel perylene molecules with different intramolecular charge-transfer (ICT) characters have been synthesized. The relation between the ICT character for donating groups and results their electro- photochemical properties as well performance in nanostructured dye-sensitized solar cells (nDSC) are reported. With stronger donors, we obtain a shift of lowest unoccupied molecular orbital (LUMO) to more negative potential versus normal hydrogen electrode (NHE) an increase charge separation...
Sunny side up: 1,6-Dithiophenol-substituted perylene organic sensitizer 1 was synthesized, and its photovoltaic properties in dye-sensitized solar cells were assessed. When anchored onto TiO2 film, the dye exhibits an unprecedented incident monochromatic photon-to-current conversion efficiency of 87 % yields a power 6.8 under standard AM 1.5 conditions.
Tin-based halide perovskite solar cells (PSCs) hold the most promise among lead-free PSCs, but they are plagued with inadequate environmental stability and power-conversion efficiency (PCE). Here we demonstrate that optimum incorporation of a bulky divalent organic cation, 4-(aminomethyl)piperidinium (4AMP), in FASnI3 thin films improves stability, optoelectronic properties, PSC performance. The optimized yields maximum PCE 10.9% good 500-h operational under continuous illumination. This is...
We present a facile molecular-level interface engineering strategy to augment the long-term operational and thermal stability of perovskite solar cells (PSCs) by tailoring between hole transporting layer (HTL) with multifunctional ligand 2,5-thiophenedicarboxylic acid. The exhibited high (maximum powering point tracking at one sun illumination) stabilized TS80 (the time over which device efficiency reduces 80% after initial burn-in) ≈5950 h 40 °C power conversion (PCE) 23%. origin...
Developing hole-transporting materials (HTMs) with appropriate molecular configuration and charge mobility is important to improve perovskite solar cell (PSC) photovoltaic performance their feasibility for commercialization. In this work, a novel pyramidal-shaped low-cost HTM coded MeOTTVT prepared through extension of π-conjugation based on triphenylamine core. Carbon–carbon double bonds are introduced between the core p-methoxyl planarity HTM, favoring intermolecular stacking thus...
In this work, we elucidate the relationship between heating-rate and FAPbI 3 perovskite phase transformation, bringing a new with crystal growth parameters. Thus, manufactured highly stable solar cells 640 ms IR pulse.