A5087791252- Perovskite Materials and Applications
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Solid-state spectroscopy and crystallography
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Optical properties and cooling technologies in crystalline materials
- Topological Materials and Phenomena
- Organic Electronics and Photovoltaics
- Advanced Photocatalysis Techniques
- Graphene research and applications
- Luminescence Properties of Advanced Materials
- Thermal Expansion and Ionic Conductivity
- Transition Metal Oxide Nanomaterials
- Polyoxometalates: Synthesis and Applications
- Covalent Organic Framework Applications
- Layered Double Hydroxides Synthesis and Applications
- Lanthanide and Transition Metal Complexes
- Carbon and Quantum Dots Applications
- Photochromic and Fluorescence Chemistry
- Thermal properties of materials
- Thin-Film Transistor Technologies
- Photochemistry and Electron Transfer Studies
University of Groningen
2016-2024
Abstract Two-dimensional metal halide perovskites of Ruddlesden–Popper type have recently moved into the centre attention perovskite research due to their potential for light generation and stabilisation 3D counterparts. It has become widespread in field attribute broad luminescence with a large Stokes shift self-trapped excitons, forming strong carrier–phonon interactions these compounds. Contrarily, by investigating behaviour two types lead-iodide based single crystals, we here highlight...
Abstract Chemical doping is an important approach to manipulating charge-carrier concentration and transport in organic semiconductors (OSCs) 1–3 ultimately enhances device performance 4–7 . However, conventional strategies often rely on the use of highly reactive (strong) dopants 8–10 , which are consumed during process. Achieving efficient with weak and/or widely accessible under mild conditions remains a considerable challenge. Here, we report previously undescribed concept for...
Abstract 2D perovskite materials have recently reattracted intense research interest for applications in photovoltaics and optoelectronics. As a consequence of the dielectric quantum confinement effect, they show strongly bound stable excitons at room temperature. Here, band‐edge exciton fine structure particular its biexciton dynamics high quality crystals (PEA) 2 PbI 4 are investigated. A comparison bulk surface lifetimes yields temperature recombination velocity × 10 3 cm s −1 an...
2D metal halide perovskites can show narrow and broad emission bands (BEs), the latter's origin is hotly debated. A widespread opinion assigns BEs to recombination of intrinsic self-trapped excitons (STEs), whereas recent studies indicate they have an extrinsic defect-related origin. Here, we carry out a combined experimental-computational study into microscopic for series prototypical phenylethylammonium-based perovskites, comprising different metals (Pb, Sn) halides (I, Br, Cl)....
Abstract Transport layers are of outmost importance for thin‐film solar cells, determining not only their efficiency but also stability. To bring one these technologies toward mass production, many factors besides and stability become important, including the ease deposition in a scalable manner cost different material's layers. Herein, highly efficient organic cells (OSCs), inverted structure (n‐i‐p), demonstrated by using as electron transport layer (ETL) tin oxide (SnO 2 ) deposited...
The surface chemistry of colloidal semiconductor nanocrystals (QDs) profoundly influences their physical and chemical attributes. insulating organic shell ensuring stability impedes charge transfer, thus limiting optoelectronic applications. Exchanging these ligands with shorter inorganic ones enhances mobility stability, which is pivotal for using materials as active layers LEDs, photodetectors, transistors. Among those, InP QDs also serve a model investigations. This study focuses on group...
Slow hot-carrier cooling may potentially allow overcoming the maximum achievable power conversion efficiency of single-junction solar cells. For formamidinium tin triiodide, an exceptional slow time a few nanoseconds was reported. However, systematic study cation influence, as is present for lead compounds, lacking. Here, we report first comparative on formamidinium, methylammonium, and cesium triiodide thin films. By investigating their photoluminescence, observe considerable shift emission...
Abstract Low‐dimensional halide perovskites with broad emission are a hot topic for their promising application as white light sources. However, the physical origin of this broadband in sub‐bandgap region is still controversial. This work investigates Stokes‐shifted bands mixed lead‐tin 2D perovskite films prepared by mixing precursor solutions phenethylammonium lead iodide (PEA 2 PbI 4 , PEA = phenethylammonium) and tin SnI ). The bandgap can be tuned ratio, whereas photoluminescence...
A novel in situ SnSe deposition strategy is proposed to reduce non-radiative recombination and enhance surface crystallization for scalable stable quasi-2D Ruddlesden–Popper (RP) lead–tin perovskite solar cells.
Abstract Two terminal passive devices are regarded as one of the promising candidates to solve processor‐memory bottleneck in Von Neumann computing architectures. Many different materials used fabricate memory devices, which have potential act synapses future neuromorphic electronics. Metal halide perovskites attractive for they display high density defects with a low migration barrier. However, become technology, attention should be paid on non‐toxic and scalable deposition processes....
Abstract Optoelectronic devices based on layered perovskites containing fluorinated cations display a well‐documented improved stability and enhanced performance over non‐fluorinated cations. The effect of fluorination the crystal structure photophysics, however, has received limited attention up until now. Here, 3‐fluorophenethylammonium lead iodide ((3‐FPEA) 2 PbI 4 ) single crystals are investigated their properties to ((PEA) variant compared. bulkier 3‐FPEA cation increases distortion...
Upon forward biasing the perovskite diodes, turn-on voltage of electroluminescence diminishes and its intensity substantially increases, suggesting that mobile ions do play an important role in device operation.
Ultraviolet light causes bis(phenethylammonium) tetrachlorocuprate to change color from yellow brown, which is reversible by exposure air.
The shape of the Fermi surface influences many physical phenomena in materials and a growing interest how spin-dependent properties are related to fermiology crystals has surged. Recently, novel current-dependent nonlinear magnetoresistance effect, known as bilinear magnetoelectric resistance (BMR), been shown be not only sensitive spin texture spin-polarized nonmagnetic materials, but also dependent on convexity topological semimetals. In this paper, we show that temperature dependence BMR...
Germanane, a two-dimensional Ge lattice in which each atom is hydrogen-terminated the z-direction, possesses remarkable combination of electronic and optical properties that are attractive for applications ranging from chemical sensing to electrocatalysis photocatalysis. In this work, we studied germanane (GeH) novel butyl-functionalized (GeBuxH(1−x)) as photocatalysts water purification under visible light irradiation utilizing challenging conditions terms photocatalyst loading (1 mg per g...
Cs2AgBiBr6 is a potential lead-free double perovskite candidate for optoelectronic applications; however, its large and indirect band gap imposes limitations. Here, single crystals of are doped with Cu2+ cations to increase the absorption range from visible region up 0.5 eV in near-infrared region. Inductively coupled plasma spectroscopy confirms presence 1.9% copper structure. Structural optical changes caused by Cu doping were studied Raman combined X-ray diffraction, heat capacity...
Abstract Metal halide perovskites have shown exceptionally slow hot‐carrier cooling, which has been attributed to various physical mechanisms without reaching a consensus. Here, experiment and theory are combined unveil the carrier cooling process in formamidinium (FA) caesium (Cs) tin triiodide thin films. Through impulsive vibrational spectroscopy molecular dynamics, much shorter phonon dephasing times of hybrid perovskite, accounts for larger blueshift photoluminescence seen at high...
Abstract The photophysics of 2D perovskites incorporating 1,4‐phenylenedimethanammonium (PDMA) as spacer cations is studied. PDMAPbI 4 and PDMASnI exhibit absorption luminescence spectra dominated by excitonic transitions an emission due to two different states. Low‐temperature studies reveal a time‐dependent red shift 12 meV that correlated with grain‐specific observed in optical micrographs. For the Pb‐variant, grains red‐shifted lower intensity band edge simultaneously more pronounced...
Layered metal-halide perovskites have shown great promise for applications in optoelectronic devices, where a large number of suitable organic cations give the opportunity to tune their structural and optical properties.
The shape of the Fermi surface influences many physical phenomena in materials and a growing interest how spin-dependent properties are related to fermiology crystals has surged. Recently, novel current-dependent nonlinear magnetoresistance effect, known as bilinear magnetoelectric resistance (BMR), been shown be not only sensitive spin-texture spin-polarized non-magnetic materials, but also dependent on convexity topological semimetals. In this paper, we show that temperature dependence BMR...