A5028667146- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Solid-state spectroscopy and crystallography
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Advancements in Photolithography Techniques
- Nanofabrication and Lithography Techniques
- Electron and X-Ray Spectroscopy Techniques
- Advanced ceramic materials synthesis
- VLSI and Analog Circuit Testing
- Optical Coatings and Gratings
- High-Temperature Coating Behaviors
- Integrated Circuits and Semiconductor Failure Analysis
- Catalytic Processes in Materials Science
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Gas Dynamics and Kinetic Theory
- Electronic and Structural Properties of Oxides
Panasonic (Japan)
2017-2023
Shinshu University
2023
École Polytechnique Fédérale de Lausanne
2018-2020
Tokyo Ohka Kogyo (Japan)
2005-2009
Applied Materials (Israel)
2005
Preventing the degradation of metal perovskite solar cells (PSCs) by humid air poses a substantial challenge for their future deployment. We introduce here two-dimensional (2D) A2PbI4 layer using pentafluorophenylethylammonium (FEA) as fluoroarene cation inserted between 3D light-harvesting film and hole-transporting material (HTM). The perfluorinated benzene moiety confers an ultrahydrophobic character to spacer layer, protecting from ambient moisture while mitigating ionic diffusion in...
Abstract Rapid extraction of photogenerated charge carriers is essential to achieve high efficiencies with perovskite solar cells (PSCs). Here, a new mesoscopic architecture as electron‐selective contact for PSCs featuring 40 nm sized TiO 2 beads endowed mesopores few nanometer diameters introduced. The bimodal pore distribution inherent these films produces very large area 200 m g −1 whose access by the light absorber facilitated interstitial voids between particles. Modification surface...
Abstract Today's perovskite solar cells (PSCs) mostly use components, such as organic hole conductors or noble metal back contacts, that are very expensive cause degradation of their photovoltaic performance. For future large‐scale deployment PSCs, these components need to be replaced with cost‐effective and robust ones maintain high efficiency while ascertaining long‐term operational stability. Here, a simple low‐cost PSC architecture employing dopant‐free TiO 2 CuSCN the electron...
Organic-inorganic lead halide perovskites are promising materials for realization of low-cost and high-efficiency solar cells. Because the toxicity lead, Sn-based perovskite have been developed as alternatives to enable fabrication Pb-free However, cell performance cells (Sn-PSCs) remains poor because their large open-circuit voltage (VOC) loss. lower electron affinities than Pb-based materials, which result in larger conduction band offset (CBO) values at interface between a conventional...
Its lower bandgap makes formamidinium lead iodide (FAPbI3) a more suitable candidate for single-junction solar cells than pure methylammonium (MAPbI3). However, its structural and thermodynamic stability is improved by introducing significant amount of MA bromide, both which increase the amplify trade-off between photocurrent photovoltage. Here, we simultaneously stabilized FAPbI3 into cubic lattice minimized formation photoinactive phases such as hexagonal PbI2 5% MAPbBr3, revealed...
Organic–inorganic halide perovskites (OIHPs) have been intensively studied in recent years for use solar cells. Many studies reported the light-induced phenomena of OIHP materials and their In this study, we investigated influence a hole-transport layer (HTL) on degradation (LID) mixed cells, especially at OIHP/HTL interface, by hard X-ray photoelectron spectroscopy (HAXPES) impedance spectroscopy. HAXPES shows accumulation iodine metallic lead vicinity electron-transport layer/OIHP...
There is an urge to develop new hole-transporting materials (HTMs) for perovskite solar cells (PSCs), which can yield comparable power conversion efficiencies (PCEs) yet mitigate the issue of stability associated with state-of-the-art HTM spiro-MeOTAD. Herein, we designed and prepared C2v-symmetric spiro-configured HTM-1 comprising a central acridine–cyclopentadithiophene core unit flanked triarylamine moieties. PSCs containing 40 nm thin layer hole extraction yielded stabilized PCE...
High photovoltaic performance and light stability are required for the practical outdoor use of lead-halide perovskite solar cells. To improve cells, it is effective to introduce a self-assembled monolayer (SAM) between carrier transport layer layer. Several alternative approaches in their molecular design combination with multiple SAMs support high conversion efficiency (PCE). Herein, we report new structure improving both PCE stability, which surface an electron (ETL) was modified by...
Abstract Efficiencies >20% are obtained from the perovskite solar cells (PSCs) employing Cs + and Rb based compositions; therefore, it is important to understand effect of these inorganic cations specifically on properties structures. Here influence elucidated structural, morphological, photophysical structures photovoltaic performances resulting PSCs. Structural, photoluminescence (PL), external quantum efficiency studies establish incorporation ( x < 10%) but amply rule out...
Recently, organic-inorganic halide perovskites have received attention for applications in solar cells. Measurements of high-quality single crystals reveal lower defect densities and longer carrier lifetimes than those conventional thin films, which result improved electrical optical properties. However, crystal surfaces are sensitive to exposure ambient conditions, degrade under long-term storage air. The surface also shows differences from the bulk terms its electronic characteristics. For...
Lead halide perovskite is a candidate for next-generation solar cells. Improvements in photovoltaic conversion efficiency and cell durability different environments, such as moisture, heat, light, are pertinent practical use. Researchers must solve the problem of light-induced degradation (LID) Oxygen accelerates LID. However, buffer layer between electron transport (ETL)/perovskite interface suppresses Herein, we report influence oxygen on LID at [(FA0.83MA0.17)0.95Cs0.05(I0.95Br0.05)3 with...
Inverse temperature crystallization (ITC) growth of formamidinium tin iodide (FASnI3) is realized using γ-valerolactone (GVL) solvent, which possesses a low Gutmann acceptor number. The high-crystalline ITC-grown FASnI3 film was fabricated via dip-coating method featuring high-temperature substrate and precursor solution the GVL solvent. Transmittance measurements photoluminescence spectroscopy revealed presence narrow band gap in film, contrasting with conventional single crystal...
Kelvin probe force microscopy has been employed to monitor the cross-sectional potential profile in lead-halide perovskite photovoltaic cells. From systematic investigations on many devices under varying bias voltage and light illumination conditions, we are able deduce quantitative features with low noise that allows us compare local electronic properties working against numerical calculations. We applied technique before after degradation. Through change after, located degraded components...
Double patterning with 193nm immersion lithography is generally recognized as a candidate for 32nm hp node and possibly beyond recent progress. LLE (Litho-Litho-Etch) could be good double method because of its simplicity but the solution hasn't been proposed yet. In last year, freezing free Posi/Nega process was introduced process. But that had an issue resolution negative tone resist little bit poor 1L/3S pattern compared positive tone. Thus it's better to choose 2nd this reason. And then...
Double patterning is considered the most viable option for 32- and 22-nm complementary metal-oxide semiconductor (CMOS) node development has seen a surge of interest due to remaining challenges next-generation lithography systems. Most double approaches previously described require intermediate processing steps (e.g., hard mask etching, resist freezing, spacer material deposition, etc.). These additional can add significantly cost producing pattern. Alternative litho-only processes are...
One of the well-known problems industry faces concerning 193-nm resists is its shrinkage under scanning electron microscope (SEM) measurements. While different phenomena arising from electron-material interaction are assumed to take place (such as cross-linking and scission), primary mechanism that brings about this still unclear. Three experiments were performed relating three theories for shrinkage. The first experiment examined how affected by radiation corresponds a theory exposure...
As the need to create smaller features increases, industry is moving on 193nm photoresist systems. It well known that one problem with this resist its shrinkage under secondary electron microscope (SEM) measurements. While different phenomena arising from electron-material interaction are assumed take place (such as crosslinking and scission), primary mechanism which brings about still unclear. This paper comprises four main experiments, relating theories for shrinkage. In first experiment...
Abstract We investigated the application of polycrystalline SiC coating on ceramics using vapor from a Si melt as source and C 2 H generated by decomposition CH 4 gas source. First, temperature distribution flow in furnace, behavior gas, production rate were calculated simulation software Virtual Reactor. Based these numerical results, structure furnace its internal layout decided. Next, was performed with two different layouts, layer evaluated observation microstructure. With 50 sccm...