A5068415180- Perovskite Materials and Applications
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organic Electronics and Photovoltaics
- Advanced Photocatalysis Techniques
- Solid-state spectroscopy and crystallography
- TiO2 Photocatalysis and Solar Cells
- Organic Light-Emitting Diodes Research
- Catalysis and Oxidation Reactions
- Advanced Nanomaterials in Catalysis
- Copper-based nanomaterials and applications
- Optical properties and cooling technologies in crystalline materials
- Advanced battery technologies research
- Polyoxometalates: Synthesis and Applications
- Transition Metal Oxide Nanomaterials
- Silicon and Solar Cell Technologies
- Crystallography and molecular interactions
- Thermal Expansion and Ionic Conductivity
- Geological and Geophysical Studies Worldwide
- Nanomaterials and Printing Technologies
- Dyeing and Modifying Textile Fibers
- Capital Investment and Risk Analysis
Toin University of Yokohama
2021-2025
University of Hyogo
2017-2024
The University of Tokyo
2018-2023
Tokyo University of the Arts
2021
Graduate School USA
2018
Toppan (Japan)
2014-2017
Tokyo University of Science
2007-2015
Faculty (United Kingdom)
2014-2015
Engineering (Italy)
2014-2015
Shinjuku College of Information Technology
2015
Abstract Perovskite solar cells (PSCs) are among the most promising photovoltaic technologies owing to their exceptional optoelectronic properties 1,2 . However, lower efficiency, poor stability and reproducibility issues of large-area PSCs compared with laboratory-scale notable drawbacks that hinder commercialization 3 Here we report a synergistic dopant-additive combination strategy using methylammonium chloride (MACl) as dopant Lewis-basic ionic-liquid additive,...
It could successfully control the band-bending of perovskite semiconductor, which led to improvement photovoltaic performance.
Abstract To abate the issue of moisture‐assisted phase transition CsPbI 2 Br, caused by hygroscopic dopants used in hole‐transporting material (HTM), developing dopant‐free HTMs is necessary. In this work, a new polymer, PDTDT, developed as HTM for Br solar cells, and device performance stability are systematically compared with cells employing P3HT. using PDTDT show an efficiency 17.36% V OC 1.42 FF 81.29%, which one highest values cells. Moreover, record‐high 34.20% 1.14 under 200 lux...
Abstract The emerging CsPbI 3 perovskites are highly efficient and thermally stable materials for wide‐band gap perovskite solar cells (PSCs), but the doped hole transport (HTMs) accelerate undesirable phase transition of in ambient. Herein, a dopant‐free D‐π‐A type HTM named CI‐TTIN‐2F has been developed which overcomes this problem. suitable optoelectronic properties energy‐level alignment endow with excellent charge collection properties. Moreover, provides multisite defect‐healing...
Abstract In comparison to hybrid perovskite solar cells (PSCs), all‐inorganic CsPbX 3 PSCs suffer from larger V OC deficits, leading inferior efficiency. The surface defects like iodine vacancy (V I ) are the main sources of nonradiative recombination causing a deficit. Here, 2,5‐thiophenedicarboxylic acid (TDCA) is used passivate through strong coordination interaction between thiophene unit TDCA and undercoordinated Pb 2+ perovskite. passivation also elevates valence band position, better...
All-inorganic CsPbI3 perovskite solar cells (PSCs) with efficiencies exceeding 20% are ideal candidates for application in large-scale tandem cells. However, there still two major obstacles hindering their scale-up: (i) the inhomogeneous solid-state synthesis process and (ii) inferior stability of photoactive black phase. Here, we have used a thermally stable ionic liquid, bis(triphenylphosphine)iminium bis(trifluoromethylsulfonyl)imide ([PPN][TFSI]), to retard high-temperature reaction...
Abstract Surface passivation with 2D perovskites is a powerful strategy to achieve improved stability and performance in perovskite solar cells (PSCs). Various large organic cations have been successfully implemented, led by phenylethylammonium ( PEA + ) its derivatives. However, systematic studies on sets of understand the effect substituent position device are lacking. Herein, collection halogenated iodide salts x ‐XPEAI where : ortho o ), meta m , para p X F, Cl, Br) synthesized facile...
Abstract The power conversion efficiency of perovskite solar cells continues to increase. However, defects in materials are detrimental their carrier dynamics and structural stability, ultimately limiting the photovoltaic characteristics stability cells. Herein, we report that 6H polytype effectively engineers at interface with cubic FAPbI 3 , which facilitates radiative recombination improves polycrystalline film. We particularly show effects shallow-level defect originates from formation...
Research of CH3NH3PbI3 perovskite solar cells had significant attention as the candidate new future energy. Due to toxicity, however, lead (Pb) free photon harvesting layer should be discovered replace present perovskite. In place lead, we have tried antimony (Sb) and bismuth (Bi) with organic metal monovalent cations (CH3NH3 +, Ag+ Cu+). Therefore, in this work, lead-free photo-absorber layers (CH3NH3)3Bi2I9, (CH3NH3)3Sb2I9, (CH3NH3)3SbBiI9, Ag3BiI6, Ag3BiI3(SCN)3 Cu3BiI6 were processed by...
In the inverted structure perovskite solar cells, a buffer layer is generally used at interface between n-type semiconductor and metal electrode, but its design guidelines have not yet been established. Here, series of cells fabricated with controlled thickness bathocuproine (BCP) layers deposited by thermal evaporation validated BCP evaluation tool. The ideal factor was calculated from gradient in plot Voc against log Jsc, effect on charge recombination verified. Since greatly decreased 5...
Perovskite solar cells have driven a paradigm shift in the research domain of photovoltaics. Although field has progressed tremendously, device stability holds back further progress and application to market. In this work, we aim gain insights into electron transport layer (ETL)/perovskite interfacial degradation by characterizing perovskite films with TiO2, SnO2, TiO2/SnO2 ETLs. Our results demonstrate that SnO2 maintained long-term 1000 h under maximum power point tracking, while TiO2...
Organic-inorganic metal-halide perovskite solar cells (PSCs) have achieved a certified power-conversion efficiency (PCE) of 25.5%. However, long-term stability and air the PSCs are still major concerns hamper commercialization. Herein, we employ multi-functional ionic liquid (IL), 1,3-bis(cyanomethyl)imidazolium bis(trifluoromethylsulfonyl)imide ([Bcim][TFSI]), which contains an imidazolium cation functionalized with nitrile (CN) groups TFSI anion is, additionally, able to form extensive...
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...
Because the toxicity of lead (Pb) remains a potential threat to commercialization perovskite solar cells, silver–bismuth halides such as AgBiI4, AgBi2I7, Ag2BiI5, and Ag3BiI6 with band gaps 1.8–1.9 eV strong absorption are considered be promising alternatives Pb-based perovskites, not only for outdoor (1 Sun) but also indoor photovoltaics because their gap matches best artificial light spectrum. To date, almost all studies have focused on improving power conversion efficiency (PCE) under 1...
Various approaches have been employed to passivate the defects in perovskite films used solar cells (PSCs). However, passivation mechanism is often unclear at a molecular level, and reason for enhanced PSC performance remains elusive. Here, we explore impact of with high-work-function two-dimensional (2D) perovskites promoting efficiency PSCs. We realized that 4-halophenylethylammonium lead iodide possesses high work function, causing band bending surface, thus suppressing charge carrier...
Compositional engineering of organic-inorganic metal halide perovskite allows for improved optoelectrical properties, however, phase segregation occurs during crystal nucleation and limits solar cell device performance. Herein, we show that by applying tetrabutylammonium bistriflimide as an additive in the precursor solution, ultra-uniform crystals are obtained, which effectively increases As a result, power conversion efficiencies (PCEs) 24.5% 21.2% module achieved, together with high...
Co-sensitized dye-sensitized solar cells using black dye and a pyridine-anchor (NI5 or YNI-2) showing site-selective adsorption behaviour at the TiO2 surface have been prepared for first time to reduce competitive between two dyes.
Abstract Organometal halide perovskites have demonstrated remarkable achievements in solar cell applications and attracted tremendous attention as next‐generation photovoltaic materials. Regardless of the unprecedented success, degradation perovskite has caused performance cells to be unreliable prevented their commercialization. However, detailed mechanism yet elucidated. In this study, entire procedure thermally induced methylammonium lead iodide (MAPbI 3 ) is reported using real‐time situ...
Abstract Although there is extensive attention to the eminent perovskite solar cells, deep‐level defects such as Pb‐Pb dimers in solution‐processed polycrystalline perovskites inevitably result photovoltaic output losses and subsequent degradation. Recently, it reported that an electron‐donating group can passivate Pb dimer efficiently. However, mechanism for causation of metallic lead (Pb 0 ) from iodide vacancy (V I unclear. Herein, a chain reaction proposed possible transformation process...
The lack of long-term stability and reproducibility perovskite solar cells (PSCs) is the main roadblock preventing their successful commercialization. 3D/2D PSCs are one most prominent ways to address these issues. Various salts that mostly based on phenyl ethyl ammonium iodide (PEAI) have been utilized grow a 2D layer 3D perovskites. Herein, we report effect substituting methoxy (-OMe) group at ortho (o), meta (m), para (p) positions PEAI salts. Photoluminescence time-resolved...
Perovskite and textured silicon solar cells were integrated into a tandem cell through stacking method. To consider the effective structure of for perovskite/silicon cells, optic photovoltaic properties flat surfaces compared using mechanical-stacking-tandem two- four-terminal structures by perovskite layers on crystal wafers. The reflectance texture surface in range 750-1050 nm could be reduced more than that (from 2.7 to 0.8%), which resulted increases average incident photon current...
An Nb-doped TiO2 (Nb-TiO2) film comprising a double structure stacked with bottom compact layer and top mesoporous layers was synthesized by treating Ti precursor-coated substrate using one-step low-temperature steam-annealing (SA) method. The SA-based Nb-TiO2 films possess high crystallinity conductivity, that allows better control over the conduction band (CB) of for electron transport (ETL) perovskite solar cells Nb doping level. Optimization power conversion efficiency (PCE)...
Three donor–π‐bridge–acceptor (D–π–A)‐type organic small molecules coded CI‐B1, CI‐B2, and CI‐B3 are designed, synthesized, used as dopant‐free hole transporting materials (HTMs) for perovskite solar cells (PSCs). The strong electron‐donating triazatruxene central core (D), terthiophene conjugated arms (π), three different electron‐accepting units (A) provide high intramolecular charge transfer nature eliminate the need of dopants during fabrication PSCs. HTMs investigated to understand...
Siloxane-terminated polymers with low surface energy were studied as dopant-free HTMs in PSCs. The siloxane-terminated side-chains assisted the dissolution, tuning mobility, passivating perovskite defects and enhancing hydrophobicity of polymer.
Abstract Direct understanding of the formation and crystallization low‐dimensional (LD) perovskites with varying dimensionalities employing same bulky cations can offer insights into LD their heterostructures 3D perovskites. In this study, secondary amine cation N ‐methyl‐1‐(naphthalen‐1‐yl)methylammonium (M‐NMA + ) dynamics its corresponding perovskite are investigated. The intermolecular π–π stacking M‐NMA connection inorganic PbI 6 octahedrons within product structures control perovskite....