A5041657787- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Molecular Junctions and Nanostructures
- Organic Light-Emitting Diodes Research
- Perovskite Materials and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Metal and Thin Film Mechanics
- Quantum Dots Synthesis And Properties
- Semiconductor materials and devices
- Advanced materials and composites
- Intermetallics and Advanced Alloy Properties
- Advanced Thermoelectric Materials and Devices
- Advanced Memory and Neural Computing
- Material Properties and Applications
- Diamond and Carbon-based Materials Research
- Chalcogenide Semiconductor Thin Films
- Analytical Chemistry and Sensors
- Electrochemical Analysis and Applications
- Photochemistry and Electron Transfer Studies
- Fullerene Chemistry and Applications
- Surface Chemistry and Catalysis
- Semiconductor materials and interfaces
- Titanium Alloys Microstructure and Properties
- Porphyrin and Phthalocyanine Chemistry
Linköping University
2016-2025
Laboratoire de Synthèse Organique
2019
Norrköping Hospital
2019
Science and Technology on Surface Physics and Chemistry Laboratory
2018
Soochow University
2017
East China Normal University
2017
Aix-Marseille Université
2009
University of Mons
2009
Centre National de la Recherche Scientifique
2009
Thinfilm (Sweden)
2008
Abstract In this Review, we summarize recent work on modeling of organic/metal and organic/organic interfaces. Some the models discussed have a semiempirical approach, that is, experimentally derived values are used in combination with theory, others rely completely calculations. The categorized according to types interfaces they apply to, strength interaction at interface has been as main factor. We explain basics models, their use, give examples how correlate experimental results. stress...
ABSTRACT Poly(3,4‐ethylenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT:PSS) has been reported as a successful functional material in broad variety of applications. One the most important advantages PEDOT:PSS is its water‐solubility, which enables simple and environmental friendly manufacturing processes. Unfortunately, this also implies that pristine films are unsuitable for applications aqueous environments. To reach stability polar solvents,...
Volatile impurities contained in polyethyleneimine (PEI), and identified as ethyleneimine dimers trimers, are reported. These N-based molecules show a strong reducing character, demonstrated by the change electrical conductivity of organic (semi)conductors exposed to PEI vapor. The results prove that electron transfer rather than dipole effect at electrode interface is origin work-function modification PEI-based layers. As service our authors readers, this journal provides supporting...
In electronics, the field‐effect transistor (FET) is a crucial cornerstone and successful integration of this semiconductor device into circuit applications requires stable ideal electrical characteristics over wide range temperatures environments. Solution processing, using printing or coating techniques, has been explored to manufacture organic transistors (OFET) on flexible carriers, enabling radically novel electronics applications. Ideal characteristics, in materials, are typically only...
The fast evolution of metal halide perovskite solar cells has opened a new chapter in the field renewable energy. High-quality films as active layers are essential for both high efficiency and long-term stability. Here, with enlarged crystal grain size decreased defect density fabricated by introducing extremely low-cost green polymer, ethyl cellulose (EC), into layer. addition EC triggers hydrogen bonding interactions between perovskite, passivating charge traps at boundaries. long chain...
Effects of in situ oxygen/water exposure on the energetics [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) films are presented. For oxygen exposure, work function is downshifted by ≈0.15 eV compared to ideal integer charge transfer (ICT) curve for pristine PCBM, which incompatible with significant introduction electron trap states or p-doping. Water induces highest occupied molecular orbital (HOMO) structure undergo strong, irreversible modifications accompanied a chemical interaction...
Organic photovoltaics are under intense development and significant focus has been placed on tuning the donor ionization potential acceptor electron affinity to optimize open circuit voltage. Here, it is shown that for a series of regioregular‐poly(3‐hexylthiophene):fullerene bulk heterojunction (BHJ) organic photovoltaic devices with pinned electrodes, integer charge transfer states present in dark created as consequence Fermi level equilibrium at BHJ have profound effect The state...
Organometal halide perovskites are under rapid development, and significant focus has been placed on their stability that currently presents a major obstacle for practical application. Energetics plays vital role in charge injection/extraction transport properties devices. Here, we situ investigate oxygen- water-induced energetics degradation organometal perovskite films. Oxygen gas induces an upward shift of the vacuum level films because formation oxygen-induced surface dipole, water vapor...
Abstract Organometal halide perovskites exhibit a bright future for applications in solar cells, as efficiency has achieved over 22%. The long‐term stability remains major obstacle commercialization. Here, it is found that three cationic compositional engineered perovskites, MAPb(I 0.83 Br 0.17 ) 3 , FA MA Pb(I and Cs 0.1 (FA 0.9 undergo severe degradation under white‐light illumination ultrahigh vacuum (UHV) environment, but the rate of significantly lower mixed cation perovskites. This...
Photoelectron spectroscopy was employed to examine the energetics, and therefore charge injection barriers, at top bottom contact configurations of gold conjugated polymers, i.e., polymer spin coated on vapor-deposited interfaces. Very similar results are obtained for both ex situ (contaminated) in (clean) prepared interfaces: a 0.7–0.8eV decrease vacuum energy levels is consistently observed as compared bare polycrystalline gold. These observations explained by changes metal work function...
Abstract In the pursuit of developing new materials for more efficient bulk‐heterojunction solar cells, blend poly (3‐hexylthiophene):[6,6]‐phenyl‐C 61 ‐butyric acid methyl ester (P3HT:PCBM) serves as an important model system. The success P3HT:PCBM comes from charge generation and transport with low recombination. There is not, however, a good microscopic picture what causes these, hindering development material systems. this report UV photoelectron spectroscopy measurements on both...
Responsive monolayers are key building blocks for future applications in organic and molecular electronics particular because they hold potential tuning the physico-chemical properties of interfaces, including their energetics. Here we study a photochromic SAM based on conjugated azobenzene derivative its influence gold work function (Φ(Au)) when chemisorbed surface. In show that Φ(Au) can be modulated with external stimuli by controlling trans/cis isomerization process. This phenomenon is...
Systematic investigation of the contact resistance in electrolyte‐gated organic field‐effect transistors (OFETs) demonstrates a dependence source charge injection versus gate electrode work function. This analysis reveals contact‐limitations at metal‐semiconductor interface and shows that increases as low function metals are used electrode. These findings attributed to establishment built‐in potential is high enough prevent Fermi‐level pinning metal‐organic interface. results an unfavorable...
Abstract In this short review the energy level alignment of interfaces involving solution‐processed conjugated polymer (and soluble small molecules) films is described. Some general material properties polymers and their are introduced, basic physics involved in at then discussed. An overview bending (ultra)thin (often referred to as “band bending”) given effects ion‐containing interlayers typically used organic electronic devices such light emitting diodes bulk heterojunction solar cells...
The energy level alignment at interfaces, in stacks comprising of (4,4′-N,N′-dicarbazolyl-biphenyl) (CBP), (4,4,4″-tris[3-methyl-phenyl(phenyl)amino]-triphenylamine) (m-MTDATA), and a conductive substrate, has been studied. We show that the levels depends on equilibration chemical potential throughout layer stack, while any electronic coupling between individual layers is lesser importance. This behavior expected to occur for broad class weakly interacting interfaces can have profound...
Energy barriers between the metal Fermi energy and molecular levels of organic semiconductor devoted to charge transport play a fundamental role in performance electronic devices. Typically, techniques such as electron photoemission spectroscopy, Kelvin probe measurements, in‐device hot‐electron spectroscopy have been applied study these interfacial barriers. However, so far there has not any direct method available for determination at interfaces with n‐type polymeric semiconductors. This...
Here, the Fermi level (EF) shifts of several donor and acceptor materials in different atmospheres are systematically studied by following work function (WF) changes with Kelvin probe measurements, ultraviolet photoelectron spectroscopy, near-ambient pressure X-ray spectroscopy. Reversible EF found trend higher WFs measured ambient air lower high vacuum compared to ultrahigh vacuum. The energy morphology-dependent, two mechanisms proposed: (1) competition between p-doping induced O2 H2O/O2...