A5010916348- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Thin-Film Transistor Technologies
- Silicon and Solar Cell Technologies
- Perovskite Materials and Applications
- Photochemistry and Electron Transfer Studies
- Chalcogenide Semiconductor Thin Films
- Fullerene Chemistry and Applications
- Solid-state spectroscopy and crystallography
- Organic Light-Emitting Diodes Research
- Process Optimization and Integration
- Spacecraft Design and Technology
- Liquid Crystal Research Advancements
- Semiconductor materials and interfaces
- Molecular Junctions and Nanostructures
- Luminescence and Fluorescent Materials
Karlstad University
2019-2024
Rochester Institute of Technology
2016
Non-fullerene based organic solar cells display a high initial power conversion efficiency but continue to suffer from poor thermal stability, especially in case of devices with thick active layers. Mixing five structurally similar acceptors electron affinities, and blending donor polymer is explored, yielding up 17.6%. The hexanary device performance unaffected by annealing the bulk-heterojunction layer for at least 23 days 130 °C dark an inert atmosphere. Moreover, blends offer degree...
The ternary polymerization strategy of incorporating different donor and acceptor units forming terpolymers as photovoltaic materials has been proven advantageous in improving power conversion efficiencies (PCEs) polymer solar cells (PSCs). Herein, a series low band gap nonconjugated terpolymer acceptors based on two fused-ring electron-deficient building blocks (IDIC16 ITIC) with adjustable photoelectric properties were developed. As the third component, ITIC larger π-conjugation structure,...
In this work, we have investigated a series of aniline-based squaraines, with varying solubilizing alkyl chains, as donor materials in bulk heterojunction (BHJ) solar cells. Although these squaraine molecules exhibit similar absorbance spectra and crystal structures, the difference properties that drive OPV performance becomes apparent when each is blended PCBM. Thin film X-ray diffraction results demonstrate disruption crystallization presence PCBM, more so for shorter side chain...
To facilitate industrial applications, as well for environmental and health purposes, there is a need to find less hazardous solvents processing the photoactive layer of organic solar cells. As are vast amounts possibilities combine solutes, it high importance paths discriminate among solution chemistry on theoretical basis. Using Hansen solubility parameters (HSP) offers such path. We report some examples solvent blends that have been found by modelling HSP an electron donor polymer (TQ1)...
1-Chloronaphthalene (CN) has been a common solvent additive in both fullerene- and nonfullerene-based organic solar cells. In spite of this, its working mechanism is seldom investigated, particular, during the drying process bulk heterojunctions composed donor:acceptor mixture. this work, role CN all-polymer cells investigated by situ spectroscopies ex characterization blade-coated PBDB-T:PF5-Y5 blends. Our results suggest that added promotes self-aggregation polymer donor PBDB-T blend film,...
Donor polymer PBDB-T and acceptor PF5-Y5 form D–A complexes in solution, as confirmed by combined absorption, excitation, emission spectroscopy of blend solutions.
In this study, a rational processing strategy is presented, aiming to achieve well-ordered thin films of the molecular electron acceptors Y5 and Y6 by choice solvent as key parameter. The were spin-coated from chlorobenzene (CB), chloroform (CF), ortho-xylene (o-XYL) solutions. film morphology orientation investigated atomic force microscopy (AFM) near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, respectively. A homogeneous smooth was achieved when CF used solvent. However,...
We report the design and testing of a custom-built experimental setup for dip-coating from volatile solutions under microgravity conditions onboard an aircraft. Function safety considerations equipment are described. The proved to work well, both concerning preparation thin films. No leakage solvents, nor solvent vapors, was detected, not even in situation with fluctuating gravitational field due bad weather conditions. have shown that can be used prepare films polymer blends, relevant...
In recent years, higher power conversion efficiencies have been measured using "push-pull" or Donor-Acceptor (D-A) type compounds designed to specifically address bandgap and energy level requirements. Yet, a strong prescription is fundamentally lacking that improves materials for the set of all critical properties (including exciton diffusion rate charge transport/ mobility) combine provide optimal performance. We will present our newest theoretical models simulate morphology-based...