A5009196375- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Advanced Thermoelectric Materials and Devices
- Thermal properties of materials
- Carbon Nanotubes in Composites
- Thermal Radiation and Cooling Technologies
- Quantum Dots Synthesis And Properties
- Thermography and Photoacoustic Techniques
- Perovskite Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Nanofabrication and Lithography Techniques
- Nerve injury and regeneration
- Thin-Film Transistor Technologies
- Surface and Thin Film Phenomena
- MXene and MAX Phase Materials
- Supercapacitor Materials and Fabrication
- Chemical and Physical Properties of Materials
- Luminescence and Fluorescent Materials
- Liquid Crystal Research Advancements
- Electrospun Nanofibers in Biomedical Applications
- Machine Learning in Materials Science
- Polydiacetylene-based materials and applications
- Chalcogenide Semiconductor Thin Films
- Tissue Engineering and Regenerative Medicine
- Advanced Thermodynamics and Statistical Mechanics
Institut de Ciència de Materials de Barcelona
2016-2025
Instituto de Ciencia de Materiales de Sevilla
2017-2024
Universitat de Barcelona
2023
Universitat Politècnica de Catalunya
2023
Institute for Bioengineering of Catalonia
2023
Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine
2023
Artifex University
2019
Centre de Recerca Matemàtica
2013
UV-induced switching from p- to n-type character is demonstrated during deposition of carbon-nanotube-conjugated polymer composites. This opens the possibility photopattern regions within an otherwise p-type film, which has a potential for complementary circuitry or, as shown here, thermoelectric generators made single solution.
Bacteria are used to grow in an aqueous medium a cellulose-carbon nanotube composite porous film with good thermoelectric properties, flexibility and recyclability.
Interfaces play a determining role in establishing the degree of carrier selectivity at outer contacts organic solar cells. Considering that bulk heterojunction consists blend electron donor and acceptor materials, specific relative surface coverage electrode interfaces has an impact on selectivity. This work unravels how fullerene cathode lies behind electrodes. A variety techniques such as variable-angle spectroscopic ellipsometry capacitance–voltage measurements have been used to...
Two doping mechanisms are known for the well-studied materials poly(3-hexylthiophene) (P3HT) and poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT), namely, integer charge transfer (ICT) complex (CTC) formation. Yet, there is poor understanding of effect mechanism on thermal stability thermoelectric properties. In this work, we present a method to finely adjust ICT CTC ratio. Using it, characterize electrical conductivities as well Seebeck coefficient long-term under stress...
Non-fullerene acceptors (NFAs) are excellent light harvesters, yet the origin of their high optical extinction is not well understood. In this work, we investigate absorption strength NFAs by building a database time-dependent density functional theory (TDDFT) calculations ∼500 π-conjugated molecules. The first validated comparison with experimental measurements in solution and solid state using common fullerene non-fullerene acceptors. We find that molar coefficient (εd,max) shows...
Abstract A combinatorial study of the effect in‐mixing various guests on thermoelectric properties host workhorse polymer poly[2,5‐bis(3‐tetradecylthiophen‐2‐yl)thieno[3,2‐b]thiophene] (PBTTT) is presented. Specifically, composition and thickness for doped films PBTTT blended with different polymers are varied. Some blends at guest weight fractions around 10–15% exhibit up to a fivefold increase in power factor compared reference material, leading zT values 0.1. Spectroscopic analysis...
The low endogenous regenerative capacity of the heart, added to prevalence cardiovascular diseases, triggered advent cardiac tissue engineering in last decades. myocardial niche plays a critical role directing function and fate cardiomyocytes; therefore, biomimetic scaffold holds excellent promise. We produced an electroconductive patch bacterial nanocellulose (BC) with polypyrrole nanoparticles (Ppy NPs) mimic natural microenvironment. BC offers 3D interconnected fiber structure high...
Abstract The thermal conductivity (κ) governs how heat propagates in a material, and thus is key parameter that constrains the lifetime of optoelectronic devices performance thermoelectrics (TEs). In organic electronics, understanding what determines κ has been elusive experimentally challenging. Here, by measuring 17 π‐conjugated materials over different spatial directions, it statistically shown microstructure unlocks two markedly transport regimes. long‐range ordered polymers follows...
Abstract Relatively thick‐film organic photovoltaics (OPVs) are desirable to spark commercialization through mass‐printing methods. Thickness‐resilient donor:acceptor blends are, however, scarce and not fully understood. The interplay between electronic, optical, microstructural properties of the photoactive layer (PAL) generates a multi‐parametric space where rationalization is far from trivial. In this work, high‐throughput experimentation, simulations, machine learning (ML) methods...
We present a single step, solution based method to deposit polymer films with uniaxial orientation and demonstrate its potential by fabricating polarization sensitive photovoltaic devices.
• Comparison of the thermoelectric properties different kinds carbon, nanotubes. Investigation undoped single-walled, multi-walled, as well nitrogen-doped, carbon effect nitrogen-doping method on thermoelectric, performance. Preparation nanotube composites with polythiophenes and, polyethylenimine. UV irradiation allows to tune doping in polymer/carbon nanotube, composites. This work compares various methods prepare (CNT) for applications, focusing mechanisms. We first look at general trends...
Abstract Thermoelectrics have emerged as a strategy for solar‐to‐electricity conversion, they can complement photovoltaic devices IR harvesters or operate stand‐alone systems often under strong light and heat concentration. Inspired by the recent success of inorganic‐based solar thermoelectric generators (STEGs), in this manuscript, potential benchmark organic materials harvesting is evaluated. It shown that inherent properties semiconductors allow possibility fabricating STEGs (SOTEGs)...
In the field of organic solar cells, semiconductors with Y6‐based chemical structure and their corresponding quinoxaline‐based assemblies are settled down as promising materials in OSCs. However, Y6 derivatives does not allow an expansion electron‐withdrawing central core, contrast to analogues. For this reason, herein, two different A–D–A′–D–A 2D π ‐extended cores endowed electroactive rylenimide moieties, named Y6‐1Napht Y6‐1Pery, designed synthesized . These enlarged fused‐ring electron...
In order for organic thermoelectrics to successfully establish their own niche as energy-harvesting materials, they must reach several crucial milestones, including high performance, long-term stability, and scalability. Performance stability are currently being actively studied, whereas demonstrations of large-scale compatibility far more limited carbon nanotubes (CNTs) still missing. The scalability challenge includes material-related economic considerations well the availability fast...
We demonstrate that the observed (in-)stability of n-doped carbon nanotube films in air not only depends on employed dopant but is also strongly affected by sample-specific factors, such as film thickness and density. show this for two typical dopants, polyethylenimine a potassium crown ether complex, preparing increasing thickness. argue reports stability cannot be properly assessed without knowledge these parameters, which explains some conflicting results literature.
We developed a novel contactless frequency-domain thermoreflectance approach to study thermal transport, which is particularly convenient when thermally anisotropic materials are considered. The method based on line-shaped heater geometry, produced with holographic diffractive optical element, instead of using spot as in conventional thermoreflectance. geometry similar the one used 3-omega method, however, keeping all technical advantages offered by non-contact methodologies. present...
Abstract Glycol sidechains are often used to enhance the performance of organic photoconversion and electrochemical devices. Herein, we study their effects on electronic states properties. We find that polymer glycolation not only induces more disordered packing, but also results in a higher reorganisation energy due localised π -electron density. Transient absorption spectroscopy femtosecond stimulated Raman utilised monitor structural relaxation dynamics coupled excited state formation...
We present a method to dissolve carbon nanotubes that simultaneously allows prepare n-doped films. These films are composed of thinner bundles longer tubes when compared prepared using surfactants and sonication. Their negative Seebeck coefficient high electrical conductivity make them good candidates for thermoelectric applications. investigate their stability in air by aging at elevated temperatures, showing stabilities over 500 h, which is further improved the use crown ethers. Finally,...
The nucleation of single macroscopic spherulites at desired positions, as well ordered arrays multiple spherulites, is demonstrated by combining the use crystallizable solvents with local control solvent evaporation during solution deposition. Moreover, temperature assisted localized frustration molecular orientation shown, enabling fabrication samples containing both isotropic areas and spherulites. These circular polycrystalline structures are characterized using a range polarized...
Abstract Using chlorobenzene as a base solvent for the deposition of poly(3-hexylthiophene-2,5-diyl) (P3HT) layer in P3HT:phenyl-C 61 -butyric acid methyl ester diffusive bilayer solar cells, we investigate effect adding small amounts high-boiling-point solvents with similar chemical structures on resulting active morphologies. The results demonstrate that crystallinity P3HT films well vertical donor–acceptor gradient can be tuned by this approach. use improved all photovoltaic parameters...
Transfer printing is one of the key nanofabrication techniques for large-scale manufacturing complex device architectures. It provides a cost-effective and high-throughput route integration independently processed materials into spatially tailored Furthermore, this method enables fabrication flexible curvilinear devices, paving way new generation technologies optics, electronics, biomedicine. In work, hydroxypropyl cellulose (HPC) membranes are used as water soluble adhesives transfer...
This work documents an all-in-one custom setup that allows us to measure the in-plane Seebeck coefficients and electrical conductivities of anisotropic thin film samples close room temperature. Both pairs, S∥ σ∥ S⊥ σ⊥, can be measured using four contacts on same sample, reducing measurement time minimizing potential sources error due aggregating data from several distinct samples. The conductivity isotropic well-known van der Pauw method. For with anisotropy, two components σ⊥ extracted type...
Abstract The stability of organic semiconductors is an important topic, which in the case thermoelectrics (OTEs), has not yet got attention it deserves. This work presents a simple method allows to characterize OTEs, using patterned ITO substrates electrically contact encapsulated samples. applied n‐doped carbon nanotube films, well‐suited reference system due their sensitivity changes doping level, and used compare effectiveness different encapsulation methods. In observed oxygen adsorption...