A5074938359- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Luminescence and Fluorescent Materials
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Photochemistry and Electron Transfer Studies
- Semiconductor materials and interfaces
- Molecular Sensors and Ion Detection
- Analytical Chemistry and Sensors
- Inorganic Fluorides and Related Compounds
- Fullerene Chemistry and Applications
- X-ray Diffraction in Crystallography
- Advanced Photocatalysis Techniques
- Porphyrin and Phthalocyanine Chemistry
- Crystallization and Solubility Studies
- Organic Light-Emitting Diodes Research
- Thin-Film Transistor Technologies
- Advanced Nanomaterials in Catalysis
- Inorganic and Organometallic Chemistry
- Liquid Crystal Research Advancements
- Carbon and Quantum Dots Applications
- TiO2 Photocatalysis and Solar Cells
- Carbon Nanotubes in Composites
King Abdullah University of Science and Technology
2020-2025
Ludwig-Maximilians-Universität München
2025
Materials Science & Engineering
2021
Physical Sciences (United States)
2021
Swansea University
2017-2020
University of Coimbra
2010-2019
University of Aveiro
2010
Low-dimensional (<10 nm) semiconductor quantum dots (QDs) have received great attention for potential use in biomedical applications (diagnosis and therapy) which larger nanoparticles (>10 are not suitable. Here, we demonstrate a green, biogenic synthesis route making CdS QDs with 2–5 nm particle size using tea leaf extract (Camellia sinensis) as toxic-free stabilizing agent. We explored the biological activity of these different applications, namely, (a) antibacterial activity, (b)...
Evaluation of commonly used models to fit the TRPL perovskites; retrieving meaningful data requires careful choice excitation fluence.
The frontier molecular energy levels of organic semiconductors are decisive for their fundamental function and efficiency in optoelectronics. However, the precise determination these variation when using different techniques makes it hard to compare establish design rules. In this work, 33 via cyclic voltammetry (CV), density functional theory, ultraviolet photoelectron spectroscopy, low-energy inverse spectroscopy determined. Solar cells fabricated obtain key device parameters relate them...
An approach for screening solvent systems PSCs to substitute REACH restricted DMF with no loss in device performance.
Abstract Low‐offset organic solar cell systems have attracted great interest since nonfullerene acceptors came into the picture. While numerous studies focused on charge generation process in these low‐offset systems, only a few details of each loss channel and their impact overall device performance. Here, several are blended with same polymer donor to form series where significant variation performance is observed. Through detailed analyses pathways, it found that: i) donor:acceptor...
Abstract Perovskite solar cells have attracted a great deal of attention thanks to their high efficiency, ease manufacturing, and potential low cost. However, the stability these devices is considered main drawback needs be addressed. Mesoporous carbon perovskite (m‐CPSC), consisting three mesoporous layers (TiO 2 /ZrO /C) infiltrated with CH 3 NH PbI (MAPI) perovskite, presented excellent lifetimes more than 10 000 h when additive (CH ) 4 CO HI (5‐ aminovaleric acid iodide; 5‐AVAI) used...
The ionization energy (IE) offset of a donor–acceptor pair provides the driving force for hole transfer and subsequent free charge carrier generation in low‐bandgap nonfullerene organic solar cells (OSCs). However, interfacial energetic landscape bulk heterojunction OSCs is determined by materials’ electronic structure intermolecular interactions at donor/acceptor interface, causing local energy‐level shifts disorder. Herein, impact IE on efficiency dynamics systematically evaluated...
Infectious bacterial biofilms are recalcitrant to most antibiotics compared their planktonic version, and the lack of appropriate therapeutic strategies for mitigating them poses a serious threat clinical treatment. A ternary heterojunction material derived from Bi-based perovskite–TiO2 hybrid [Ru(2,2′-bpy)2(4,4′-dicarboxy-2,2′-bpy)]2+ (2,2′-bpy, 2,2′-bipyridyl) as photosensitizer (RuPS) is developed. This found be capable generating reactive oxygen species (ROS)/reactive nitrogen (RNS) upon...
Materials exhibiting aggregation-induced emission (AIE) are both highly emissive in the solid state and prompt a strongly red-shifted should therefore pose as good candidates toward emerging near-infrared (NIR) applications of organic semiconductors (OSCs). Despite this, very few AIE materials have been reported with significant emissivity past 700 nm. In this work, we elucidate potential
Non-fullerene acceptor (NFA)-based ternary bulk heterojunction solar cells (TSC) are the most efficient organic (OSCs) today due to their broader absorption and quantum efficiencies (QE) often surpassing those of corresponding binary blends. We study how energetics driving charge transfer at electron donor:electron (D/A) interfaces impact QE in blends PBDB-T-2F donor with several pairs lower bandgap NFAs. As blends, ionization energy offset between ({\Delta}IE) controls maximizes for...
Abstract Long exciton diffusion length ( L D ) is key to maximizing excitation harvesting in organic solar cells, but contradicting values are reported for non‐fullerene acceptors (NFA). To understand the factors enabling large , experimental observation of decay by transient absorption spectroscopy (TAS) combined with microscopic Kinetic Monte Carlo (KMC) simulations on 4 ITIC derivatives. Exciton decays fitted considering singlet exciton‐singlet annihilation (SSA) and intrinsic exciton's...
Two novel fluorescent probes bearing a single (P) and two (a podand-like structure, L) pyrene units derived from 1,5-bis(2-aminophenoxy)-3-oxopentane have been synthesized investigated in dioxane using UV–vis absorption, steady-state time-resolved (in picosecond time scale) emission spectroscopy; the gas phase, matrix-assisted laser desorption ionization mass spectrometry was employed. In dioxane, absorption spectra of P present unique band with maxima at 361 392 nm, which associated monomer...
The photochemistry and stability of fullerene films is found to be strongly dependent upon film nanomorphology. In particular, PC61BM blend films, dispersed with polystyrene, are more susceptible photobleaching in air than the aggregated neat films. This enhanced correlated increased oxygen quenching triplet states appearance a carbonyl FTIR absorption band indicative oxidation, suggesting photo-oxidation primarily due triplet-mediated singlet generation. were observed undergo for even...
Abstract Most current highly efficient organic solar cells utilize small molecules like Y6 and its derivatives as electron acceptors in the photoactive layer. In this work, a molecule acceptor, SC8‐IT4F, is developed through outer side chain engineering on terminal thiophene of conjugated 6,12‐dihydro‐dithienoindeno[2,3‐d:2′,3′‐d′]‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene (IDTT) central core. Compared to reference C8‐IT4F, which lacks chains, SC8‐IT4F displays notable differences geometry (as...
A commercial poly(acrylic acid) (PAA, M(n) = 450 000 g mol(-1)) has been labeled with high levels (9.1 mol %) of pyrene by reaction 1-pyrenylmethylamine in the presence boric acid. The modified polymer was found to display an unusual photophysical behavior closely resembling that for constrained environments. appearance a band at longer wavelengths excitation spectra when collected long wavelength emission attributed dimer. this dimer particularly enhanced dioxane:water solvent mixtures low...
Energy level alignments at the organic donor–acceptor interface cannot be predicted from cyclic voltammetry. Onsets for joint density of states and charge generation, reveal cases energy uphill – newly observed downhill generation.
Novel BODIPY forming triplet excited states via the SOCT-ISC process was used for polymerization of methacrylate monomers inside a hybrid sol–gel material. Holographic recording diffractive structures with high efficiency demonstrated.
We present an experimental proof-of-concept study of organic semiconductor nanoparticles (NPs) for visible-light-driven carbon dioxide (CO 2 ) conversion.
Co-sensitisation of methylammonium lead tri-bromide perovskite solar cells with red (D205) and blue (SQ2) organic dyes improves device efficiencies allows colour tuning. Sensitising the film after crystallisation produces higher (2.6% SQ2, 3.1% D205) than perovskite-only devices (2%) sensitised before layer deposition (1.5% 2.0% D205).