A5055513736- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Thin-Film Transistor Technologies
- Silicon and Solar Cell Technologies
- Photovoltaic System Optimization Techniques
- solar cell performance optimization
- Perovskite Materials and Applications
- Neuroscience and Neuropharmacology Research
- Integrated Circuits and Semiconductor Failure Analysis
- Nanomaterials and Printing Technologies
- Molecular Junctions and Nanostructures
- Electron and X-Ray Spectroscopy Techniques
- Nanowire Synthesis and Applications
- Cannabis and Cannabinoid Research
- Neurotransmitter Receptor Influence on Behavior
- Energy Harvesting in Wireless Networks
- Photosynthetic Processes and Mechanisms
- Chalcogenide Semiconductor Thin Films
- Modular Robots and Swarm Intelligence
- Machine Learning in Materials Science
- Advanced Sensor and Energy Harvesting Materials
- Organic Light-Emitting Diodes Research
- Semiconductor materials and interfaces
- Advanced Memory and Neural Computing
- Industrial Vision Systems and Defect Detection
University of Southern Denmark
2023-2024
Technical University of Denmark
2010-2018
Sankt Hans Hospital
1998-2010
The spatial distribution of reaction products in multilayer polymer solar cells induced by water and oxygen atmospheres was mapped used to elucidate the degradation patterns failure mechanisms an inverted cell. active material comprised a bulk heterojunction formed poly(3-hexylthiophene) (P3HT) [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) sandwiched between layer zinc oxide poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) that acted as, respectively, electron hole...
The investigation of degradation seven distinct sets (with a number individual cells n ≥ 12) state the art organic photovoltaic devices prepared by leading research laboratories with combination imaging methods is reported. All have been shipped to and degraded at Risø DTU up 1830 hours in accordance established ISOS-3 protocols under defined illumination conditions. Imaging device function different stages was performed laser-beam induced current (LBIC) scanning; luminescence imaging,...
The results of a meta‐analysis conducted on organic photovoltaics (OPV) lifetime data reported in the literature is presented through compilation an extensive OPV database based large number articles, followed by analysis body data. We fully reveal progress lifetimes. Furthermore, generic marker has been defined, which helps with gauging and comparing performance different architectures materials from perspective device stability. Based analysis, conclusions are drawn bottlenecks for...
It's a free-for-all! ITO-free organic photovoltaics are fabricated using roll-to-roll processing technology and laser cutting to separate encapsulate individual modules. The modules then made available free-of-charge from the author′s website (in an effort named "freeOPV") create platform which can be evaluated information shared by researchers all over world.
Seven distinct sets (n ≥ 12) of state the art organic photovoltaic devices were prepared by leading research laboratories in a collaboration planned at Third International Summit on Organic Photovoltaic Stability (ISOS-3). All shipped to RISØ DTU and characterized simultaneously up 1830 h accordance with established ISOS-3 protocols under three illumination conditions: accelerated full sun simulation; low level indoor fluorescent lighting; dark storage daily measurement simulation. Three...
Fabrication of polymer solar cell (PSC) modules was done on a previously reported compact coating/printing machine and tested in readily scalable roll process flexible substrates without applying vacuum, ITO or spin coating. Our aim to establish loss upon scaling from cells small modules. We studied single (1 cm2) comprising four serially connected devices with total active area 8 cm2. Four different polymers (P3HT, PV-D4610, PDTSTTz-4 PBDTTTz-4) were applied the preparation efficiencies...
Photochemical degradation at 1 sun under AM1.5G illumination was performed on six conjugated polymers and five different electron acceptors. Additionally, the respective polymer:PC60BM P3HT:electron acceptor blends were studied, all degradations resolved in terms of film thickness absorbance. A fully automated setup allowed for inclusion excess 1000 this study to enable a discussion reliability technique. Degradation rates found increase exponentially with decreasing absorbance materials....
The results presented demonstrate how the screening of 104 light‐absorbing low band gap polymers for suitability in roll coated polymer solar cells can be accomplished through rational synthesis according to a matrix where 8 donor and 13 acceptor units are organized rows columns. Synthesis all corresponding combinations is followed by characterization materials with respect molecular weight, electrochemical energy levels, gaps, photochemical stability, carrier mobility, photovoltaic...
The process of accurately gauging lifetime improvements in organic photovoltaics (OPVs) or other similar emerging technologies, such as perovskites solar cells is still a major challenge. presented work part larger effort developing worldwide database lifetimes that can help establishing reference baselines stability performance for OPVs and PV which then be utilized pass‐fail testing standards predicting tools. study constitutes scanning literature articles related to data OPVs, reported...
The stability of fully printed flexible organic electrochromics based on 11 different conjugated polymers is explored from the fundamental chemical degradation level to operational device level. photochemical electrochromic (ECPs) studied enabling an analysis influence that constitution polymer backbone has stability. Based changes in UV-visible absorption and IR spectra, were categorized into two distinct groups, each with a separate mechanism. During irradiation (1000 W m−2, AM 1.5G) under...
We are here presenting a comparative study between four different types of functionalities for cross-linking. With relatively simple means bromine, azide, vinyl and oxetane could be incorporated into the side chains low band-gap polymer TQ1. Cross-linking polymers was achieved by UV-light illumination to give solvent resistant films reduced phase separation growth PCBM crystallites in polymer:PCBM films. The stability solar cells based on cross-linked tested under various conditions. This...
This work is part of the inter-laboratory collaboration to study stability seven distinct sets state-of-the-art organic photovoltaic (OPV) devices prepared by leading research laboratories. All have been shipped and degraded at RISØ-DTU up 1830 hours in accordance with established ISOS-3 protocols under defined illumination conditions. In this work, we apply Incident Photon-to-Electron Conversion Efficiency (IPCE) situ IPCE techniques determine relation between solar cell performance...
As mass‐produced, low‐cost organic electronics enter our everyday lives, so does the waste from them. The challenges associated with end‐of‐life management must be addressed by careful design and carbon‐based electrodes are central to these developments. Here, reproducible production of vacuum‐, indium tin oxide (ITO)‐, silver‐free solar cells in a fully packaged form using only roll‐to‐roll processing is reported. Replacing silver carbon as electrode material significantly lowers...
ABSTRACT Two low‐band gap polymer series based on benzo[1,2‐ b :4,5‐ ′]dithiophene (BDT) and dithienylbenzothiadiazole, with different numbers of fluorine substituents the 2,3,1‐benzothiadiazole unit, have been synthesized explored in a comparative study photochemical stability operational lifetime flexible large area roll‐coated bulk heterojunction solar cells. The two side chains BDT namely 2‐hexyldecyloxy (BDT HDO ) ( P1–P3 or 2‐hexyldecylthiophene THD P4–P6 ). clearly shows that enhances...
New thermally reactive copolymers based on dithienylthiazolo[5,4-d]thiazole (DTZ) and silolodithiophene (SDT) have been synthesized explored in bulk heterojunction solar cells as mixtures with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). In thin films the polymers had optical band gaps range of 1.64–1.80 eV. For solubility incorporated alkyl groups SDT unit removable DTZ that can be eliminated around 200 °C for improved photochemical stability films. The bulkiness chains proved to very...
We show that it is possible to perform ellipsometry on large area roll-to-roll (R2R) coated solar cells flexible substrates and further demonstrate the slot-die coating technique employed yields same bulk heterojunction (BHJ) film morphology vertical phase separation as laboratory samples prepared by spin technique. The cell device geometry was Kapton/Al/Cr/P3HT:PCBM/PEDOT:PSS/Ag. Variable angle used determine optical dispersions of pure phases P3HT PCBM allowing an effective medium...
The present work is the fourth (and final) contribution to an inter-laboratory collaboration that was planned at 3rd International Summit on Organic Photovoltaic Stability (ISOS-3). involved six laboratories capable of producing seven distinct sets OPV devices were degraded under well-defined conditions in accordance with ISOS-3 protocols. degradation experiments lasted up 1830 hours and more than 300 cells 100 devices. analyzed characterized different points their lifetimes by a large...
Abstract A solution‐processed silver film is employed in the processing of top‐illuminated indium‐tin‐oxide (ITO)‐free polymer solar cells single‐ and double‐junction (tandem) structures. The nontransparent fully covers substrate serves as bottom electrode whereas a PEDOT:PSS/Ag grid forms semitransparent top electrode. All layers are roll‐coated/printed on flexible by using only two techniques: slot–die coating for up to 11 consecutive flexo‐printing last Ag layer. coated compared an...