A5088743340- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- TiO2 Photocatalysis and Solar Cells
- Chalcogenide Semiconductor Thin Films
- Advanced Photocatalysis Techniques
- Organic Electronics and Photovoltaics
- Innovative Microfluidic and Catalytic Techniques Innovation
- Organic Light-Emitting Diodes Research
- Nonlinear Optical Materials Research
- Gold and Silver Nanoparticles Synthesis and Applications
- solar cell performance optimization
- Porphyrin and Phthalocyanine Chemistry
- Analytical Chemistry and Sensors
- Solid-state spectroscopy and crystallography
- Copper-based nanomaterials and applications
The University of Tokyo
2012-2025
General Sciences (United States)
2025
Tokyo University of the Arts
2021
Potassium-doped organometal halide perovskite solar cells (PSCs) of more than 20% power conversion efficiency (PCE) without I-V hysteresis were constructed. The crystal lattice the was expanded with increasing potassium ratio, where both absorption and photoluminescence spectra shifted to longer wavelength, suggesting that optical band gap decreased. In case 5% K+, conduction minimum (CBM) became similar CBM level TiO2-Li. this situation, electron transfer barrier at interface between...
An efficient metal-free formulation of a hole transport material (HTM) based on an ionic liquid polymer is developed for n–i–p perovskite solar cells (PSCs), to address reproducibility issues related the use complex dopant mixtures lithium salts and cobalt coordination complexes. The conductivity HTM thus significantly improved by 4 orders magnitude, up 1.9 × 10–3 S·cm–1, using poly(1-butyl-3-vinylimidazolium bis(trifluoromethylsulfonyl)imide) (PVBI-TFSI) as dopant. Introduced in...
AgBiS2 nanocrystals (NCs) are nontoxic, lead-free, and near-infrared absorbing materials. Eco-friendly solar cells were constructed using interdigitated layers of ZnO nanowires (NWs) NCs, with the aim elongating otherwise short carrier diffusion length NC assembly. NCs uniformly infiltrated into NW a low-cost easily scalable dip coating method. The resulting NW/AgBiS2 structures provided efficient pathways in nanowire (NWSCs), composed transparent electrode/ZnO layer/P3HT hole transport...
Abstract Here efficient organic photovoltaic devices fabricated from water‐based colloidal dispersions with donor:acceptor composite nanoparticles achieving up to 9.98% power conversion efficiency (PCE) are reported. This high for water processed solar cells is attributed morphology control by surface energy matching between the donor and acceptor materials. Indeed, due a low interfacial acceptor, no large phase separation occurs during nanoparticle formation process as well upon thermal...
Eco-friendly solar cells were fabricated using interdigitated layers comprising ZnO nanowires (NWs) and infrared absorbing AgBiS2 nanocrystals (ITO/ZnO NWs/AgBiS2/P3HT/Au). The quality of NWs was studied photoluminescence Raman spectroscopy to identify the defects in influencing cell performance. Oxygen vacancies Zn interstitial sites, among various recombination observed be main sites for carrier recombination, which hinders collection cells. Accordingly, power conversion efficiency...
Abstract Dye-sensitized solar cells (DSSCs) are photoelectrochemical devices that can generate electricity in various light environments. To mitigate the inherent dependence of DSSC output on intermittent nature Sun irradiation and to satisfy ever-increasing demand for photovoltaic power generation, development high-performance energy-storable DSSCs incorporate an energy-storage electrode similar a rechargeable battery through precise design electrochemical cell structure constitutes...
Perovskite solar cells are one of the most actively studied next-generation cells. This is mainly because high power conversion efficiencies can be achieved even with simple solution-based fabrication processes. In addition, wide bandgap perovskite used as top sub-cells in multi-junction due to their easily tunable properties. On other hand, colloidal quantum dots (CQDs), whose band gap depends on dot size, few options that compatible solution processes and employed lower sub-cells. Here, we...
Four solvents from the glycol ether (GE) family were evaluated as safer alternatives to highly toxic 2-methoxyethanol (2ME) used for fabrication of perovskite solar cells (PSCs). A self-quenching process by spin-coating acetonitrile (ACN)-based ink 7 s was developed. The influence ACN:GE ratio on coverage layers and cell efficiency investigated find that with 8:1 four studied here can produce PSCs an similar 2ME therefore be a replacement latter.
Perovskite solar cells (PSCs) have attracted attention as one of the next-generation cell. To enhance power conversion efficiency (PCE) PSCs, a great deal research has been conducted so far, mainly in field material development. However, in-plane cell design for evaluating performance PSCs are currently not standardized. In this study, optimization device structures was investigated aim to minimize charge transfer losses and improve FF PCE. The fabrication perovskite is follows; (i) electron...
Effects of central metal ions in porphyrin-sensitized solar cells were investigated by using 5-(4-carboxyphenyl)-10,15,20-tris(2,4,6-trimethylphenyl)porphyrins as sensitizers and I -/I3 -or Br -/Br3 -as redox mediators.Zn(II), Cu(II), Pd(II), free-base porphyrins synthesized, the properties them photovoltaic performances dye-sensitized (DSSCs) are compared.The electron injection processes from dyes into TiO2 changing Li + concentration electrolytes.The regeneration examined comparing...
The carrier transport properties of solar cells fabricated with colloidal AgBiS2 nanocrystals (NCs) are affected by the type ligands adsorbed on nanoparticle surface, coverage, and coordination state. We focus halide ions (F−, Cl−, Br−, I−) to passivate surface NCs investigate their adsorption behavior using X-ray photoelectron spectroscopy (XPS) in this study. strength was a useful figure merit that could explain correlation between ligand cell performance. Br achieved best NC passivation...
We found the color variation of TiO2–TCNQ surface complex showing photoinduced direct charge transfer transitions. The separation is achieved at same time as photon absorption in this mechanism, while usual mechanisms appearing photocatalysis and solar cells need two steps reactions: generation electronic excited states by injection electrons from donor to acceptor. complexes enabled us reveal a basic principle for complex, that is, relation between interfacial structures photo properties,...
In this study, we found that the open-circuit voltage (Voc) of dye-sensitized solar cells was improved by using interhalogen ions (XY2 -; X, Y = I or Br) synthesized mixing iodide and bromide redox couples.I -ions are important for obtaining a higher short-circuit current (Jsc) in bromine-based electrolyte.The charge transfer diffusion resistances were determined electrochemical impedance spectroscopy.The mediators photoenergy conversion efficiency (PCE) achieved high Voc 0.91 V.
Organic Photovoltaics In article number 2300249, Antoine Bousquet, Natalie P. Holmes, Sylvain Chambon, and co-workers achieve power conversion efficiencies approaching 10% by careful control of the nanoparticle thin film morphologies thanks to surface energies considerations. This approach opens route low environmental footprint photovoltaics. Representing a promise this sustainable direction in organic photovoltaics, image shows deposition active layer from water-based nanoparticles inks.
Abstract not Available.