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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • sodium lighting system
  • modeling
  • radiation curves
  • LED lighting system
  • software goniophotometer
  • upper half-space
应用领域
  • Electrical Engineering and Automation
机构单位
  • VSB-TU Ostrava
91 条数据
?? 中文（中国） ▾

  • Potassium Treatments for Solution-Processed Cu(In,Ga)(S,Se) <sub/>2</sub> Solar Cells

    摘要： Cu(In,Ga)(S,Se)2 (CIGSe, CIGSSe) has emerged as an attractive thin-film solar cell absorber material owing to its high light absorption coefficient and tunable bandgap. In CIGSSe processing and fabrication, the use of alkali treatments has been implemented as sodium doping is considered a requirement for high efficiency CIGSSe solar cell devices and has been used extensively. One of the more significant developments in recent years has been the discovery of the beneficial effects that potassium post-deposition treatments have on vacuum-processed CIGSSe solar cells as they are responsible for a major increase in CIGSSe solar cell performance. Here, we conduct a study of the effect of potassium treatments to solution-processed CIGSSe films grown from colloidal sulfide-based nanoparticle inks. By adding potassium through e-beam evaporation of KF prior to selenization and grain growth, we find that the grain growth of CIGSSe is enhanced with potassium addition and that a larger-grained film results compared to untreated selenized CIGSSe film, similar to what is observed in sodium-treated films. We also observe through XPS that films treated with K show the presence of the high-bandgap K-In-Se surface phase. Fabricating devices, we find that films that have been subjected simultaneously to both sodium and potassium treatments have enhanced optoelectronic performance mainly manifested in higher open-circuit voltage and higher short-circuit current.

    关键词： CIGS,alkali treatment,Cu(In,Ga)(S,Se)2,solution-processed solar cells,potassium fluoride,chalcopyrite solar cell,sodium fluoride

    更新于2025-09-23 15:21:01

  • Extrinsic Ion Distribution Induced Field Effect in CsPbIBr <sub/>2</sub> Perovskite Solar Cells

    摘要： Excellent power conversion efficiency (PCE) and stability are the primary forces that propel the all-inorganic cesium-based halide perovskite solar cells (PSCs) toward commercialization. However, the intrinsic high density of trap state and internal nonradiative recombination of CsPbIBr2 perovskite film are the barriers that limit its development. In the present study, a facile additive strategy is introduced to fabricate highly efficient CsPbIBr2 PSCs by incorporating sulfamic acid sodium salt (SAS) into the perovskite layer. The additive can control the crystallization behaviors and optimize morphology, as well as effectively passivate defects in the bulk perovskite film, thereby resulting in a high-quality perovskite. In addition, SAS in perovskite has possibly introduced an additional internal electric field effect that favors electron transport and injection due to inhomogeneous ion distribution. A champion PCE of 10.57% (steady-output efficiency is 9.99%) is achieved under 1 Sun illumination, which surpasses that of the contrast sample by 16.84%. The modified perovskite film also exhibits improved moisture stability. The unencapsulated device maintains over 80% initial PCE after aging for 198 h in air. The results provide a suitable additive for inorganic perovskite and introduce a new conjecture to explain the function of additives in PSCs more rationally.

    关键词： sulfamic acid sodium,additive engineering,inorganic perovskites,perovskite solar cells,moisture stability

    更新于2025-09-23 15:21:01

  • Synthesis of peptide-human telomere DNA conjugate as fluorometric imaging reagent for biological sodium ion

    摘要： Peptide-oligonucleotide conjugate (1) was synthesized by attachment of FAM, TAMRA, and biotin moieties to telomere DNA sequence of 5’-TAG GGT TAG GGT TAG GGT TAG GG-3’. This conjugate was induced anti-parallel structure in the presence of sodium ion (Na+), whereas hybrid one was formed under potassium ion (K+) as a monitoring by circular dichromic spectra. This conformation change of this conjugate gave effective FRET signal change upon addition of NaCl comparing with the case of KCl. Under 5 mM KCl as extracellular condition, FRET change was observed upon addition of NaCl and quantitative FRET change was observed in 0 – 250 mM NaCl. This conjugate was immobilized on the cell surface through sugar chain on the cell, biotinyl Concanavallin A and streptavidin. This conjugate was utilized the Na+ sensing based on anti-parallel tetraplex formation with Na+.

    关键词： sodium ion,antiparallel tetraplex,hybrid tetraplex,FAM,fluorometric imaging,potassium ion,Peptide-oligonucleotide conjugate,TAMRA

    更新于2025-09-23 15:21:01

  • Fluorescent emission from a natural carbon matrix incorporating sodium

    摘要： The process of functionalization of metals in natural carbon matrices has become an important area of research due to its improved properties and applications. Carbon materials possessing photoluminescence (PL) properties find a wide range of applications in photonics. Among the various carbon materials available in nature, cellulose has critical importance since it is the most abundant and wide-spread biopolymer on Earth, and also, the important component in plants’ skeleton. In the present work, the functionalized carbonaceous material is prepared by the hydrothermal treatment of natural cellulosic source Aloe Vera and the metallic element sodium is properly incorporated into it by adding sodium borohydride to observe the fluorescence emission changes. The incorporation of metal ions in the carbon matrix leads to structural modifications and properties as evidenced by field emission scanning electron microscopy, Energy dispersive spectroscopy, X-ray dot mapping, X-ray Photoelectron spectroscopy, and X-ray diffraction analysis. The optical emission characteristics are studied using Photoluminescence spectroscopy, CIE plot, power spectrum, color purity, and quantum yield. The excitation wavelength dependent photoluminescence emission mechanism shown by the carbon–metal incorporated products obtained from the cellulosic raw materials makes them suitable for biomedical and biosensing applications because of the non-toxic and eco-friendly nature.

    关键词： Photoluminescence,Hydrothermal treatment,Sodium incorporation,Carbon matrix,Aloe Vera

    更新于2025-09-23 15:21:01

  • Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO2 Photoanode

    摘要： By simple soaking titanium dioxide (TiO2) films in an aqueous Na2S solution, we could prepare surface-modified photoanodes for application to dye-sensitized solar cells (DSSCs). An improvement in both the open-circuit voltage (Voc) and the fill factor (FF) was observed in the DSSC with the 5 min-soaked photoanode, compared with those of the control cell without any modification. The UV–visible absorbance spectra, UPS valence band spectra, and dark current measurements revealed that the Na2S modification led to the formation of anions on the TiO2 surface, and thereby shifted the conduction band edge of TiO2 in the negative (upward) direction, inducing an increase of 29 mV in the Voc. It was also found that the increased FF value in the surface-treated device was attributed to an elevation in the shunt resistance.

    关键词： surface modification,conduction band edge shift,dye-sensitized solar cell,sodium sulfide

    更新于2025-09-23 15:19:57

  • 685PA MULTICENTER PHASE II STUDY OF SALVAGE PHOTODYNAMIC THERAPY USING TALAPORFIN SODIUM AND A DIODE LASER FOR LOCAL FAILURE OF ESOPHAGEAL CANCER AFTER CHEMORADIOTHERAPY

    摘要： We previously reported that photodynamic therapy (PDT) has a potential to cure local failure after chemoradiotherapy (CRT) for esophageal cancer (EC). However, first-generation PDT using porfimer sodium and an excimer dye laser has several problems: a high occurrence of skin phototoxicity, the requirement of a long light shielding period (6 weeks), and the need for an expensive and large laser generator. Talaporfin sodium (Laserphyrin?) is a second-generation photosensitizer that requires a shorter light shielding period (2 weeks) and induces less phototoxicity. We previously identified the optimum diode laser fluence (100 J/cm2) for PDT using talaporfin sodium in the phase I/IIA study. Therefore, in the present study, we conducted a multicenter phase IIB study to evaluate the efficacy and safety of PDT using talaporfin sodium as a salvage treatment for local failure after CRT or radiotherapy (RT) for EC. (UMIN000009184).

    关键词： chemoradiotherapy,non-colorectal,esophageal cancer,photodynamic therapy,talaporfin sodium,diode laser,gastrointestinal tumours

    更新于2025-09-23 15:19:57

  • Scanning laser optical tomography resolves developmental neurotoxic effects on pioneer neurons

    摘要： Developmental neurotoxic compounds impair the developing human nervous system at lower doses than those affecting adults. Standardized test methods for assessing developmental neurotoxicity (DNT) require the use of high numbers of laboratory animals. Here, we use a novel assay that is based on the development of an intact insect embryo in serum-free culture. Neural pathways in the leg of embryonic locusts are established by a pair of afferent pioneer neurons, extending axons along a well-defined pathway to the central nervous system. After exposure to test chemicals, we analyze pioneer neuron shape with conventional fluorescence microscopy and compare it to 3D images, obtained by scanning laser optical tomography (SLOT) and processed by a segmentation algorithm. The segmented SLOT images resolve the 3D structure of the pioneers, recognize pathfinding defects and are thus advantageous for detecting DNT-positive compounds. The defects in axon elongation and pathfinding of pioneer axons caused by two DNT-positive reference compounds (methylmercury chloride; sodium(meta)arsenite) are compared to the biochemically measured general viability of the embryo. Using conventional fluorescence microscopy to establish concentration-response curves of axon elongation, we show that this assay identifies methylmercury chloride and the pro-apoptotic compound staurosporine as developmental neurotoxicants.

    关键词： pioneer neurons,scanning laser optical tomography,sodium(meta)arsenite,developmental neurotoxicity,methylmercury chloride,staurosporine

    更新于2025-09-23 15:19:57

  • Luminescent Sulfur Quantum Dots for Colorimetric Discrimination of Multiple Metal Ions.

    摘要： The classical chemistry of sodium thiosulphate was applied to synthesize luminescent Sdots where elemental sulfur produced in situ was etched with NaOH. This method notably reduces the synthesis time of Sdots in comparison to the previously reported etching technique of bulk sulfur. The as-synthesized Sdots exhibited excitation dependent photoluminescence with a QY of 2.5 %, photostabality under UV light irradiation, excellent dispersibility in aqueous medium and also the stability even after several weeks. Notably, no emission was observed due to the oxidation of PEG-400 during the course of reaction. The Sdots was then employed as a dual function probe for the sensing of metal ions. Using fluorimetric method, Sdots showed preferential selectivity towards the Co2+ metal ions. However, a single probe Sdots can colorimetrically distinguish multiple metal ions such as Co2+, Cr6+ and Pb2+ by displaying color change on the immediate addition of analytes. Furthermore, the color change of Sdots is demonstrated with the help of hue images and hue spectra (or histogram) that will help in the development of Sdots based portable device. The present study contributes to the further advancement of this emerging field as a promising single-element nanomaterial an alternative to luminescent metallic nanomaterials.

    关键词： Colorimetric Discrimination,Photoluminescence,Hue,Sodium Thiosulphate,Sdots,Metal Ions

    更新于2025-09-23 15:19:57

  • Infrared spectroscopic analysis on structural changes around the protonated Schiff base upon retinal isomerization in light-driven sodium pump KR2

    摘要： Krokinobacter rhodopsin 2 (KR2) was discovered as the first light-driven sodium pumping rhodopsin (NaR) in 2013, which contains unique amino acid residues on C-helix (N112, D116, and Q123), referred to as an NDQ motif. Based on the recent X-ray crystal structures of KR2, the sodium transport pathway has been investigated by various methods. However, due to complicated structural information around the protonated Schiff base (PRSB) region in the dark state and lack of structural information in the intermediates with sodium bound in KR2, detailed sodium pump mechanism is still unclear. Here we applied comprehensive low-temperature light-induced difference FTIR spectroscopy on isotopically labeled KR2 WT and site-directed mutant proteins (N112A, D116E, R109A, and R109K). We assigned the N-D stretching vibration of the PRSB at 2095 cm?1 and elucidate the hydrogen bonding interaction with D116 (a counter ion for the PRSB). We also assigned strongly hydrogen-bonded water (2333 cm?1) near R109 and D251, and found that presence of a positive charge at the position of R109 is prerequisite for the pumping function of KR2.

    关键词： Retinal,Sodium ion pump,Low-temperature FTIR,Protein-bound water,Hydrogen bond

    更新于2025-09-23 15:19:57

  • Solar Cell Applications of Solution-Processed AgInGaSe2 Thin Films and Improved Properties by Sodium Doping

    摘要： Binary nanoparticle inks comprising Ag2Se, In2Se3, and Ga2Se3 were fabricated via a wet ball-milling method and were further used to fabricate AgInGaSe2 (AIGS) precursors by sequentially spraying the inks onto a Mo-coated substrate. AIGS precursors were annealed under a Se atmosphere for 1 h at 570°C. Na2Se thin layers of varying thicknesses (0, 5, 10, and 20 nm) were vacuum-evaporated onto the Mo layer prior to the AIGS precursors being fabricated to investigate the influence on AIGS solar cells. Sodium plays a critical role in improving the material properties and performance of AIGS thin-film solar cells. The grain size of the AIGS films was significantly improved by sodium doping. Secondary ion mass spectroscopy illustrated slight surficial sodium segregation and heavy sodium segregation at the AIGS/Mo interface. Double-graded band profiles were observed in the AIGS films. With the increase in Na2Se thickness, the basic photovoltaic characteristics of the AIGS solar cells were significantly improved. The highest solar cell conversion efficiency of 6.6% (open-circuit voltage: 775.6 mV, short-circuit current: 15.5 mA/cm2, fill factor: 54.9%, area: 0.2 cm2) was obtained when the Na2Se thickness was 20 nm.

    关键词： sodium doping,non-vacuum method,AgInGaSe2 solar cell,conversion efficiency

    更新于2025-09-23 15:19:57