A5035580050- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Molecular Junctions and Nanostructures
- Semiconductor materials and interfaces
- Thin-Film Transistor Technologies
- Fullerene Chemistry and Applications
- Chalcogenide Semiconductor Thin Films
- Advanced Thermoelectric Materials and Devices
- Photorefractive and Nonlinear Optics
- Nanowire Synthesis and Applications
- Photonic and Optical Devices
- Photochromic and Fluorescence Chemistry
- Advanced Sensor and Energy Harvesting Materials
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Quantum Dots Synthesis And Properties
- Advanced ceramic materials synthesis
- Tribology and Wear Analysis
- Nuclear Physics and Applications
- Advanced machining processes and optimization
- Gas Sensing Nanomaterials and Sensors
- Luminescence and Fluorescent Materials
- Copper Interconnects and Reliability
- Advancements in Semiconductor Devices and Circuit Design
Chalmers University of Technology
2023-2025
King Abdullah University of Science and Technology
2019-2024
Kootenay Association for Science & Technology
2020
Bavarian Center for Applied Energy Research
2017
Mahatma Gandhi Institute
2013
Mahatma Gandhi Institute of Technology
2013
Ternary organic solar cells based on polymer donor and nonfullerene acceptors (NFAs) are delivering high power conversion efficiencies (PCE). Now, further improvement needs to be directed enhance the operational lifetime of photovoltaics. Here, we selected three NFAs with different electron affinities structural properties found that most crystalline third component, O-IDTBR, is selectively miscible within acceptor phase. This reduced trap-assisted recombination delivered a PCE 16.6% fill...
Thermoelectric (TE) generators that are capable of providing sustainable energy conversion under dynamic mechanical stresses have been explored for realizing autonomous wearable electronics. However, finding extremely deformable, efficient, and air-stable TE materials is still a major challenge. Here, we report highly stretchable efficient organic from aqueous composites poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) ionic liquids (ILs). In this composite, ILs...
Efficiencies of organic solar cells have practically doubled since the development non-fullerene acceptors (NFAs). However, generic chemical design rules for donor-NFA combinations are still needed. Such proposed by analyzing inhomogeneous electrostatic fields at donor-acceptor interface. It is shown that an acceptor-donor-acceptor molecular architecture, and alignment parallel to interface, results in energy level bending destabilizes charge transfer state, thus promoting its dissociation...
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...
This work introduces nickel(<sc>ii</sc>) dibutyldithiocarbamate as a broadband and universal antioxidant for conjugated polymer semiconductors.
Abstract While photovoltaic blends based on non‐fullerene acceptors are touted for their thermal stability, this type of acceptor tends to crystallize, which can result in a gradual decrease performance and affects the reproducibility devices. Two halogenated indacenodithienothiophene‐based that readily co‐crystallize upon mixing studied, indicates use an mixture alone does not guarantee formation disordered mixture. The addition donor polymer suppresses crystallization, results fine‐grained...
Control of the preferred vertical phase distribution components in photoactive layer is vital importance to improve device performance and stability organic photovoltaics (OPVs). Herein, a universal sequential-deposition strategy demonstrated realize optimal by employing orthogonal solvents synergistically integrating ternary/quaternary compositions consisting insulating heat-resistant poly(aryl ether)s as third/fourth component layer. The selective segregation middle active enhances...
Abstract The high crystallinity and ability to harvest near‐infrared photons make diketopyrrolopyrrole (DPP)‐based polymers one of the most promising donors for performing organic solar cells (OSCs). However, DPP‐based OSC devices still suffer from trade‐off between energetic loss ( E ) maximum external quantum efficiency (EQE max ), which significantly hinders their potential. Thus far, replacement fullerenes with small molecule acceptors did not wisdom performance development...
Halide perovskites are emerging as a new class of materials for thermoelectric applications owing to their low thermal conductivity and high Seebeck coefficient (thermopower). In this work, the parameters vapor-deposited hybrid perovskite thin films explored first time. We establish relationship between chemical composition properties sequentially CH3NH3PbI3 films. A composition-dependent grain size in-plane electrical evolution is observed its influence on analyzed. An ultralow 0.32 ± 0.03...
Abstract In organic semiconductors, a donor/acceptor heterojunction is typically required for efficient dissociation of excitons. Using transient absorption spectroscopy to study the dynamics excited states in non‐fullerene acceptors (NFAs), it shown that NFAs can generate charges without interface. This due fact dielectric solvation provides driving force sufficient dissociate state and form charge‐transfer (CT) state. The CT further dissociated into free at interfaces between...
Abstract Functionally graded materials (FGMs) are widely explored in the context of inorganic thermoelectrics, but not yet organic thermoelectrics. Here, impact doping gradients on thermoelectric properties a chemically doped conjugated polymer is studied. The in‐plane drift counterions moderate electric fields used to create lateral films composed polythiophene with oligoether side chains, 2,3,5,6‐tetrafluoro‐tetracyanoquinodimethane (F 4 TCNQ). Raman microscopy reveals that bias voltage as...
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 Conductive polymers have become crucial in advancing various electronic applications. While p‐type materials like poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) are widely used and produced at scale, the development of high‐performance n‐type has lagged due to challenges synthesis scalability. In this work, a novel method is introduced synthesize highly conductive polymer poly(benzodifurandione) (PBFDO) using α‐tocopherylquinone (α‐TQ) as catalyst. This approach...
The elastic modulus is a critical parameter for the design of conjugated polymers wearable electronics and correlates with electrical thermal transport. Yet, widely different values have been reported same material because influence processing measurement conditions, including temperature, mode, direction, time scale deformation. Thus, results obtained via methods are usually not considered to be comparable. Here, disparate techniques from nanoindentation tensile testing free-standing films...
Power conversion efficiencies (PCEs) of organic solar cells (OSCs) have now surpassed 19%. This has led to an increased focus on developing devices using methods and materials that are scalable, processable under ambient air atmospheres, stable. However, current fall short the essential requirements for stability processability needed cost-effective large-scale fabrication high-performing OSCs. Here, we report a hybrid solution-processable hole transport layer (HTL) based tantalum-doped...
Molecular doping is an effective approach to tune the charge density and optimize electrical performance of conjugated polymers.However, introduction dopants, on other hand, may disturb polymer microstructure disrupt transport path, often leading a decrease carrier mobility deterioration conductivity doped films.Here we show that dopant-induced disorder can be overcome by rational engineering polymer-dopant interactions, resulting in remarkable enhancement conductivity.Benchmark...
Abstract Molecular engineering of organic semiconductors provides a virtually unlimited number possible structures, yet only handful combinations lead to state‐of‐the‐art efficiencies in photovoltaic applications. Thus, design rules that guide material development are needed. One such principle is bulk heterojunction consisting an electron donor and lower bandgap acceptor offset (ΔIE) at least 0.45 eV required between both materials ionization energies overcome energy level bending the...
Core:shell architecture of Teflon AF:Pd coated with PMMA, which generates a protective barrier against carbon monoxide, simultaneously allowing fast and selective hydrogen sensing.