A5069895128- Perovskite Materials and Applications
- Luminescence and Fluorescent Materials
- Luminescence Properties of Advanced Materials
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Porphyrin and Phthalocyanine Chemistry
- Photochromic and Fluorescence Chemistry
- Photoreceptor and optogenetics research
- TiO2 Photocatalysis and Solar Cells
- Silicon and Solar Cell Technologies
- Nanoplatforms for cancer theranostics
- Synthesis and Properties of Aromatic Compounds
- Silicon Nanostructures and Photoluminescence
- Economic Growth and Productivity
- Analytical Chemistry and Sensors
- Organic Chemistry Cycloaddition Reactions
- bioluminescence and chemiluminescence research
- Fullerene Chemistry and Applications
- Solid-state spectroscopy and crystallography
- Advanced Memory and Neural Computing
- Energy, Environment, Economic Growth
- Economic and Technological Innovation
- Radical Photochemical Reactions
University of Southern Denmark
2019-2022
University of Copenhagen
2018
Uppsala University
2011-2015
Photon upconversion based on sensitized triplet–triplet annihilation has been observed nanocrystalline ZrO2 films cosensitized with platinum(II) octaethylporphyrin (triplet sensitizer) and 9,10-diphenylanthracene (singlet emitter) under sunlight-like conditions (noncoherent excitation source, light intensity as low 5 mW/cm2). Time-resolved emission measurements showed a fast rise of the upconverted signal (≤10 ns), suggesting that triplet energy migration most probably occurs through...
Photon upconversion by sensitized triplet–triplet annihilation (UC-STTA) is a promising strategy for boosting the theoretical maximum efficiency of single threshold solar cells, in particular, dye-sensitized cells (DSSCs). Here, we report substantial increase UC-STTA on nanostructured surface, using noncoherent excitation light with intensities as low 0.5 mW cm–2, easily achieved under sun illumination. The studied surface was mesoporous ZrO2 film working proxy system study photophysics...
Photon upconversion by sensitized triplet–triplet annihilation (UC-STTA) is a promising strategy for breaking the Shockley–Queisser limit efficiency of single-threshold solar cells, and in particular dye-sensitized cells (DSSCs). Here, we report on heterogeneous UC system, where annihilating dyes ("emitters") are bound to ZrO2 nanostructured film light absorbing ("sensitizers") free solution. A comparative study four different emitter was conducted, all them derivatives well-known UC-STTA...
Photon upconversion by sensitized triplet–triplet annihilation (UC-STTA) is studied in systems with triplet sensitizers and emitter molecules cochemisorbed onto nanostructured ZrO2 films. UC-STTA a promising strategy to overcome the Shockley–Queisser efficiency limit of single-threshold solar cells. The dye-loaded mesoporous films herein allow high molecular densities are good proxy for study photophysics relevant dye-sensitized Two sensitizer/emitter dye pairs studied: platinum(II)...
Degradation of perovskite solar cells (PSCs) is often found to be partially or fully reversible when the are allowed recover in dark. Unlike dynamics degradation, knowledge about PSC cell recovery very limited. Here, we demonstrate that strongly depends on electrical bias conditions during light-induced degradation and it can manipulated by applying an external phase. Investigation allows us analyze mechanisms detail. More specifically, aged a mixed-cation mixed-halide with n-i-p structure...
Photochemical and mechanical stability are critical in the production application of organic solar cells. While these factors can individually be improved using different additives, there is no example studies on combined effects such additive-assisted stabilization. In this study, properties PTB7:[70]PCBM cells studied upon implementation two additives: carotenoid astaxanthin (AX) for photochemical silicone polydimethylsiloxane (PDMS) properties. A newly designed additive, AXcPDMS, based...
Upconversion of sunlight with energy below the band gap a solar cell is promising technique for enhancing efficiency, simply by utilizing larger part spectrum. The present topical review addresses this concept and discusses material properties needed an efficient upconversion process focus on both silicon organic cells. To design upconverters, insight into topics such as quantum-optics, nano-optics, numerical modeling, optimization, fabrication, characterization paramount, necessary concepts...
Abstract The gain and loss of aromaticity plays a key role in organic chemistry the prediction rate‐determining steps. Herein, we explore concept photoisomerization reactions. Benzannulated derivatives dihydroazulene‐vinylheptafulvene (DHA‐VHF) photoswitch were investigated using transient absorption spectroscopy time‐dependent density functional theory to elucidate effect built‐in on switching properties. We found that benzannulation hampered ability by enhancing an already existing barrier...
In this study, we observe near-infrared-to-visible photon upconversion via sensitized triplet–triplet annihilation in a solid-state film based on neat palladium(II) 1,4,8,11,15,18,22,25-octa-n-butoxyphthalocyanine [PdPc(OBu)8] and 5,6,11,12-tetraphenylnapthacene (rubrene). By continuous excitation at 730 nm, the system reaches maximum quantum yield of 3.6 × 10–2% power densities below 0.2 W cm–2. Although observed is most likely negatively affected by efficient singlet exciton fission films,...
Hybrid molecules involving subphthalocyanine and Buckminsterfullerene derivatives are interesting candidates as heavy metal free triplet sensitizers. Subphthalocyanine efficiently absorbs visible photons transfer the singlet excited state energy to where intersystem crossing produces states in high yield. Thus, far efficiency of triplet-generating photophysics these systems has been hampered by back resulting loss excitation energy. Herein an efficient strategy is realized avoid transfer. A...
Abstract The front cover artwork is provided by the Hansen and Mikkelsen groups from University of Copenhagen. image shows how excited state aromaticity affects photochemistry dihydroazulene (DHA). Inducing enhances an barrier, so DHA can no longer reach photoproduct. Read full text Article at 10.1002/cptc.201900088 .