A5032788571- Perovskite Materials and Applications
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Quantum Dots Synthesis And Properties
- Polyoxometalates: Synthesis and Applications
- Advanced NMR Techniques and Applications
- Polymer composites and self-healing
- Organic Light-Emitting Diodes Research
- Synthesis and properties of polymers
- 2D Materials and Applications
- Organic and Molecular Conductors Research
- Organic Electronics and Photovoltaics
- Polydiacetylene-based materials and applications
- Layered Double Hydroxides Synthesis and Applications
- High-Energy Particle Collisions Research
- Transition Metal Oxide Nanomaterials
- Coral and Marine Ecosystems Studies
- Luminescence Properties of Advanced Materials
- Particle physics theoretical and experimental studies
- Electronic and Structural Properties of Oxides
- Quantum Chromodynamics and Particle Interactions
École Polytechnique Fédérale de Lausanne
2021-2025
King Abdulaziz City for Science and Technology
2024
Cost management and toxic waste generation are two key issues that must be addressed before the commercialization of perovskite optoelectronic devices. We report a groundbreaking strategy for eco-friendly cost-effective fabrication highly efficient solar cells. This involves usage high volatility co-solvent, which dilutes precursors to lower concentration (<0.5 M) while retaining similar film quality device performance as (>1.4 solution. More than 70% material cost can reduced. Mechanistic...
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...
Abstract Surface passivation has been widely employed to suppress non‐radiative charge recombination and prevent interfacial accumulation in perovskite photovoltaics. In this report, carbazole modified with ammonium iodide connected via alkyl chains of different lengths (i.e., ethyl, butyl, hexyl chains) is used form layers on formamidinium lead triiodide FAPbI 3 ‐based films improve operational stability. Owing the strong hydrophobicity moiety, it observed that a layer retain their initial...
Abstract The performance of perovskite solar cells is highly dependent on the fabrication method; thus, controlling growth mechanism crystals a promising way towards increasing their efficiency and stability. Herein, multi‐cation halide composition engineered via two‐step sequential deposition method. Strikingly, it found that adding mixtures 1D polymorphs orthorhombic δ‐RbPbI 3 δ‐CsPbI to PbI 2 precursor solution induces formation porous mesostructured hexagonal films. This porosity greatly...
The presence of defects at the interface between perovskite film and carrier transport layer poses significant challenges to performance stability solar cells (PSCs). Addressing this issue, we introduce a dual host-guest (DHG) complexation strategy modulate both bulk interfacial properties FAPbI
Abstract There is an ongoing surge of interest in the use formamidinium (FA) lead iodide perovskites photovoltaics due to their exceptional optoelectronic properties. However, thermodynamic instability desired cubic perovskite (α‐FAPbI 3 ) phase at ambient conditions leads formation a yellow non‐perovskite (δ‐FAPbI that compromises its utility. A stable α‐FAPbI achieved by employing benzylammonium (BzI) and microscopic structure elucidated using solid‐state NMR spectroscopy X‐ray scattering...
Surface and bulk molecular modulators are the key to improving efficiency stability of hybrid perovskite solar cells. However, due their low concentration, heterogeneous environments, sample mass, it remains challenging characterize structure dynamics at atomic level, as required establish structure–activity relationships. Nuclear magnetic resonance (NMR) spectroscopy has revealed a wealth information on atomic-level perovskites, but inherent insensitivity NMR severely limits its utility...
Abstract Perovskite solar cells have led the new surge of energy research. However, their instability is a pressing issue mostly attributed to perovskite interface with charge‐selective transport layers. In this work, diethylammonium iodide (DEAI) surface treatment used mitigate interfacial non‐radiative recombination losses by forming mixed phase layered on surface. This results in enhanced device performance power conversion efficiency 23.3% and improved operational stability under thermal...
Metal halide perovskites have shown exceptional potential in converting solar energy to electric power photovoltaics, yet their application is hampered by limited operational stability. This stimulated the development of hybrid layered (two-dimensional, 2D) based on hydrophobic organic spacers, templating perovskite slabs, as a more stable alternative. However, conventional spacer cations are electronically insulating, resulting charge confinement within inorganic thus limiting...
Metal halide perovskites have shown exceptional potential in converting solar energy to electric power photovoltaics, yet their application is hampered by limited operational stability. This stimulated the development of hybrid layered (two‐dimensional, 2D) based on hydrophobic organic spacers, templating perovskite slabs, as a more stable alternative. However, conventional spacer cations are electronically insulating, resulting charge confinement within inorganic thus limiting...
Organic materials can tune the optical properties in layered (2D) hybrid perovskites, although their impact on photophysics is often overlooked. Here, we use transient absorption spectroscopy to probe Dion-Jacobson (DJ) and Ruddlesden-Popper (RP) 2D perovskite phases. We show formation of charge transfer excitons DJ phases, resulting a photoinduced Stark effect which shown be dependent spacer size. By using electroabsorption spectroscopy, quantify strength electric field, while...
Low-dimensional hybrid perovskites have emerged as promising materials for optoelectronic applications. Although these already demonstrated enhanced stability compared to their three-dimensional perovskite analogues, functionality has been limited by the insulating character of organic moieties that primarily play a structure-directing role. This is particularly case layered (2D) based on formamidinium lead iodide (FAPbI3) remain scarce. We demonstrate low-dimensional material SPbI4...
Arene–perfluoroarene moieties are used to assemble Dion-Jacobson perovskite phases, revealing nanosegregation and enhanced environmental stabilities relevant their application.
Functionalization of heteroarylated dithieno[3,2-b:2′,3′-d]pyrroles (DTPs) by triarylamines was elaborated to result in novel hole-transport materials (HTMs) for perovskite solar cells. The new HTMs showed promising photovoltaic performance with efficiencies exceeding 18%. A thorough investigation the electronic and optoelectronic properties revealed that main efficiency loss mechanisms are not related pristine HTM but suboptimal interface passivation doping. We provide an optimization...
Abstract Interfacial space charges significantly influence transport and recombination of charge carriers in optoelectronic devices. Due to the mixed ionic‐electronic conducting properties halide perovskites, not only electronic effects, but also ionic interactions at their interfaces need be considered analysis charges. Understanding these control is currently missing. This study elucidates effects on formation interface between methylammonium lead iodide (MAPI) alumina, its modulation...
Helical modulators improve the operational stability of perovskite solar cells without a significant effect on photovoltaic characteristics, challenging role chiral interfacial in hybrid photovoltaics.
Abstract Hybrid perovskites stand out as one of the leading materials in new generation photovoltaics. Their stability under operating conditions, however, remains an ongoing challenge. In particular, aging at interface with charge transport contributes to degradation during operation. To address this, functionalized triarylamine‐based modulators are employed, which known form hole‐transporting supramolecular stacks, between perovskite active layer and material conventional solar cells. As a...