A5032699626- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Advanced Photocatalysis Techniques
- Solid-state spectroscopy and crystallography
- Organic Electronics and Photovoltaics
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organic Light-Emitting Diodes Research
- Photochemistry and Electron Transfer Studies
- Luminescence and Fluorescent Materials
- Advanced battery technologies research
- TiO2 Photocatalysis and Solar Cells
- Ga2O3 and related materials
- Organic and Molecular Conductors Research
- Spectroscopy and Quantum Chemical Studies
- Gas Sensing Nanomaterials and Sensors
- CO2 Reduction Techniques and Catalysts
- Luminescence Properties of Advanced Materials
- 2D Materials and Applications
- Copper-based nanomaterials and applications
- Optical properties and cooling technologies in crystalline materials
- Molecular Junctions and Nanostructures
- Advanced Nanomaterials in Catalysis
National Yang Ming Chiao Tung University
2015-2025
To solve the toxic issue for new-generation photovoltaic applications, tin-based perovskite solar cells are a promising alternative to their lead counterparts, but they suffer from poor stability because of tendency exhibit tin oxidation. Herein we report new sequential method deposition based on solution processing using hexafluoro-2-propanol as solvent deposit eight bulky ammonium cations top 3D layer form 3D/quasi-2D protect grains penetration by moisture. The formation 2D was confirmed...
Abstract Near infrared energy remains untapped toward the maneuvering of entire solar spectrum harvesting for fulfilling nuts and bolts hydrogen production. We report use Au@Cu 7 S 4 yolk@shell nanocrystals as dual-plasmonic photocatalysts to achieve remarkable production under visible near illumination. Ultrafast spectroscopic data reveal prevalence long-lived charge separation states both excitation. Combined with advantageous features nanostructures, achieves a peak quantum yield 9.4% at...
CoOx is a promising hole-extracting layer (HEL) for inverted planar perovskite solar cells with device configuration ITO/CoOx/CH3NH3PbI3/PCBM/Ag. The devices fabricated according to simple solution procedure showed the best photovoltaic performance attaining power conversion efficiency (PCE) of 14.5% under AM 1.5 G 1 sun irradiation, which significantly superior those materials traditional HEL such as PEDOT:PSS (12.2%), NiOx (10.2%), and CuOx (9.4%) same experimental conditions. We...
Abstract Reduced graphene oxides (rGO) are synthesized via reduction of GO with reducing agents as a hole‐extraction layer for high‐performance inverted planar heterojunction perovskite solar cells. The best efficiencies power conversion (PCE) these rGO cells exceed 16%, much greater than those made and poly(3,4‐ethenedioxythiophene):poly(styrenesulfonate) films. A flexible device shows PCE 13.8% maintains 70% its initial performance over 150 bending cycles. It is found that the period...
The hybrid perovskite/graphene oxide composite layer increased the interfacial contact between donor and acceptor of holes to balance charge mobility improved photovoltaic performance with excellent reproducibility stability.
This work is the first report on a hole-selective tin-based perovskite solar cell (PSC) using concept of self-assembled monolayer (SAM) to modify ITO surface fabricate uniform tin layer via two-step sequential deposition method. Herein, we developed preheating procedure diminish effectively amounts hydroxyl groups and oxygen vacancies produce SAM. The substrate preheated at 400 °C gave best device performance for an efficiency power conversion (PCE) reaching 6.5%, 80% initial PCE was...
We report the synthesis and characterization of alloyed Sn–Pb methylammonium mixed-halide perovskites (CH3NH3SnyPb1–yI3–xClx) to extend light harvesting toward near-infrared region for carbon-based mesoscopic solar cells free organic hole-transport layers. The proportions Sn in are well-controlled by mixing tin chloride (SnCl2) lead iodide (PbI2) varied stoichiometric ratios (y = 0–1). SnCl2 plays a key role modifying lattice structure perovskite, showing anomalous optical optoelectronic...
Fabrication of mesoporous carbon-based perovskite solar cells <italic>via</italic> slow crystallization using NMP solvent attained a great device efficiency 15% with preferred orientation the crystals at (004) facet.
Alcohol-based bifunctional ammonium cations, 2-hydroxyethylammonium (HEA+), HO(CH2)2NH3+, were introduced into formamidinium (FA+) tin-based perovskites (HEAxFA1–xSnI3; x = 0–1) to absorb light in carbon-based mesoscopic solar cells. We found that HEA+ cations play a key role control the crystal structures, lattice structures altered from orthorhombic (x 0) rhombohedral 0.2–0.4) with greater symmetry. When was increased 0.6–1.0, tin and iodide vacancies formed generate 3D-vacant...
Configuration of the perovskite solar cell and diagram mechanism preparation TiO<sub>2</sub> using atomic-layer deposition.
The effects of additives SnF2 (10%) and EDAI2 (1%) on the dynamics carrier relaxation formamidinium tin triiodide (FASnI3) perovskite were studied using femtosecond transient absorption spectra (TAS) with excitation at 600 870 nm. TAS analyzed according to a parallel sequential kinetic model global fit through singular-value decomposition. For nm, two paths found: one involved hot cold carriers in bulk state undergoing shallow bulk-defect-mediated charge recombination; other trap surface...
We report a simple synthetic approach to grow uniform CH3NH3PbI3 perovskite (PSK) layers free of pinholes via varied portions silver iodide (AgI) added the precursor solution. XRD/EDS elemental mapping experiments demonstrated nearly Ag distribution inside film. When 1% AgI-assisted films were fabricated into p-i-n planar device, photovoltaic performance was enhanced by ∼30% (PCE increased from 9.5% 12.0%) relative standard cell without AgI. Measurement electronic properties using hall setup...
Tin-based perovskites degrade rapidly upon interaction with water and oxygen in air because Sn–I bonds are weak. To address this issue, we developed novel tin perovskites, FASnI(3–x)(SCN)x (x = 0, 1, 2, or 3), by employing a pseudohalide, thiocyanate (SCN–), as replacement for halides an inhibitor to suppress the Sn2+/Sn4+ oxidation. The structural electronic properties of pseudohalide series were explored quantum-chemical calculations plane-wave density functional theory (DFT) method;...
Bismuth oxyiodide (BiOI), a two-dimensional material, is well known for its photocatalytic and photovoltaic properties owing to low bandgap, efficient charge separation, suitable work function that facilitates various reactions. However, the performance of BiOI depends on synthetic methods, as they dictate growth directions overall quality nanosheets or crystals produced. Herein, we investigated morphology charge-separated character in photoexcited states nanocrystals/sheets produced from...
Solar cells with high efficiency, low cost, and stability are the target for new generation of solar cells. A fully printable perovskite (CH3NH3PbI3) cell (PSC) device architecture FTO/TiO2/Al2O3/NiOx/C is fabricated in current research as a low-cost relatively stable structure investigated to determine how different fabrication factors such thickness insulating spacer layer (Al2O3) or treatments heat UV-O3 can affect interfacial properties this multilayer mesoporous structure. X-ray...
Overcoming the issue of stability tin-based perovskites is a major challenge for commercial development lead-free perovskite solar cells. To attack this problem, new organic cation, azetidinium (AZ), incorporated into crystal structure formamidinium tin triiodide (FASnI3 ) to form mixed-cation AZx FA1-x SnI3 . As AZ has similar size FA but larger dipole moment, hybrid films exhibit variation in optical and electronic properties on increasing proportion AZ. Trifluoromethylbenzene (CF3 C6 H5...
We designed an S-heterojunction system with a perovskite nanocrystal, Cs1–xFAxPbBr3 (CF), coupled bismuth oxyiodide (BiOI) nanosheet to form heterojunction (PHJ) photocatalyst. On the basis of femtosecond transient absorption measurements, pristine CF sample has two charge recombination periods, 100 and 900 ps, corresponding surface bulk trap-state relaxations, respectively. When was in contact BiOI S-heterojunction, rapid interfacial occurred show decay components time coefficients 1 35...
Solar cells based on organometal-halide perovskites such as CH3NH3PbI3 have emerged a promising next-generation photovoltaic system, but the underlying photophysics and photochemistry remain to be established because of limited availability methods implement simultaneous direct measurement various charge carriers ions that play crucial role in operating device. We used nanosecond time-resolved infrared (IR) spectroscopy investigate, with high molecular specificity, distinct transient species...
The dynamics of exciton and free-carrier relaxation low-dimensional tin iodide perovskites, BA2FAn-1SnnI3n+1, where n = 1 (N1), 2 (N2), 5 (N5), 10 (N10), were investigated with femtosecond transient absorption spectra (TAS). photoluminescence N1 N2 show characteristics due to quantum confinement, whereas N5 N10 display a nature, the same as for bulk three-dimensional (3D) films. TAS profiles fitted according global kinetic model three time coefficients representing interactions biexcitons,...
Tin perovskite solar cells (TPSCs) were developed by adding the co-cations acetamidinium (AC) and rubidium (Rb) in varied proportions based on FASnI3 structure (E1). We found that 10% AC 3% Rb can optimize device (E1AC10Rb3) to attain an efficiency of power conversion 14.5% with great shelf- light-soaking stability. The films at characterized using XPS, SEM, AFM, GIWAXS, XRD, TOPAS, TOF-SIMS, UV–vis, PL, TCSPC, femtosecond TAS techniques show excellent optoelectronic properties E1AC10Rb3...
Electroabsorption (E-A) spectra of lead halide perovskites, that is, CH3NH3PbI3–xBrx (x = 0–3), which show large spectral shift depending on the ratio between iodine and bromide, have been measured. By analyzing E-A with integral method, shape absorption for first exciton band binding energy determined. Magnitudes change in electric dipole moment molecular polarizability following excitation into state also evaluated these perovskites. The electron hole materials as well magnitude is roughly...
Abstract Back electron transfer (BET) is one of the important processes that govern decay generated ion pairs in intermolecular photoinduced reactions. Unfortunately, a detailed mechanism BET reactions remains largely unknown spite their importance for development molecular photovoltaic structures. Here, we examine reaction pyrene (Py) and 1,4‐dicyanobenzene (DCB) acetonitrile (ACN) by using time‐resolved near‐ mid‐IR spectroscopy. The Py dimer radical cation (Py 2 .+ ) DCB anion (DCB .−...
A simple one-pot synthesis of stable red-emitting perovskite nanocrystals involved the addition Cs-oleate, formamidinium bromide (FABr) and organic ammonium iodide salts (L n I, = 1–5) to a hot flask containing oleic acid, oleylamine PbI 2 .