A5047180955- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Silicon and Solar Cell Technologies
- Thin-Film Transistor Technologies
- Perovskite Materials and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Non-Destructive Testing Techniques
- Organic Light-Emitting Diodes Research
- Chalcogenide Semiconductor Thin Films
- Advanced Sensor and Energy Harvesting Materials
Forschungszentrum Jülich
2018-2025
University of Duisburg-Essen
2018
For indoor light harvesting, the adjustable band gap of molecular semiconductors is a significant advantage relative to many inorganic photovoltaic technologies. However, several challenges have be overcome that include processability in nonhalogenated solvents, sufficiently high thicknesses (>250 nm) and efficiencies at illuminances typically found environments. Here, we report on development application new methods quantify identify performance losses based thickness- intensity-dependent...
Abstract In organic solar cells, bimolecular recombination is a key factor limiting the device performance and creating need for characterization. Light‐intensity‐dependent short‐circuit current density measurements are frequently used tool to qualitatively analyze in device. When applying 0D model, expected reduce otherwise linear correlation of J sc light intensity Φ sublinear trend. It shown by numerical simulations that slope –Φ curve affected mechanism (direct or via traps), spatial...
Abstract With increasing efficiencies of non‐fullerene acceptor‐based organic solar cells, thin‐film technology is becoming a promising candidate for indoor light harvesting applications. However, the lack standardized comparison methods makes it difficult to quantify progress and compare performance. Herein, simple method calculate efficiency cells under any possible source illuminance with only using standard measurements (current–voltage curves quantum efficiency) presented. Thereby,...
Abstract In addition to achieving record efficiencies of ≈20%, organic photovoltaics (OPV) has overcome several additional challenges. These include researching environmentally friendly solvents, improving stability, yield, and scaling up industrial standards in terms cell size mass production. However, identifying the optimal candidates from countless material combinations determining exact process parameters is like looking for a needle haystack. Process optimization usually comprises...
Abstract The energetic disorder has been known for decades to limit the performance of structurally disordered semiconductors such as amorphous silicon and organic semiconductors. However, in past years, high‐performance solar cells have emerged showing a continuously reduced amount disorder. While searching future high‐efficiency material systems, it is therefore important correctly characterize this there are several techniques literature, most common approaches probe density defect states...
An absorber layer that does not fully cover the substrate is a common issue for thin-film solar cells such as perovskites. However, models describe impact of pinholes on cell performance are scarce. Here, we demonstrate certain combinations contact layers suppress negative better than others. The absence at pinhole gives way to direct electrical between two semiconducting electron and hole transport layers. key understand how resulting nonlinear diodelike behavior current across interface...
Abstract Non‐fullerene acceptors have recently revolutionized indoor organic photovoltaics (OPVs) with power conversion efficiencies exceeding 30% in laboratory scale. Nevertheless, transferring their superior performance to larger‐scale prototyping, i.e., air‐processing via roll‐to‐roll compatible techniques, still shows severe challenges. Herein, the industrial potential of PM6:IO4Cl blend, which is one most successful OPV photoactive layers (PALs), thoroughly investigated. The...
Abstract Apart from traditional large‐scale outdoor application, organic solar cells are also of interest for powering small, off‐grid electronic devices indoors. For operation under the low light intensities that typical indoor a high shunt resistance is required calling thick active layers in industrial processing to ensure maximum coverage. However, thickness an cell based on energetically disordered semiconductors limited by space‐charge effects charged shallow defects nonuniform...
Energetic disorder has been known for decades to limit the performance of structurally disordered semiconductors such as amorphous silicon and organic semiconductors. However, in past years, high solar cells have emerged showing a continuously reduced amount energetic disorder. While searching future efficiency material systems, it is therefore important correctly characterize this there are several techniques literature, most common approaches probe density defect states using optical...