- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
A new electrochemically prepared composite counter electrode for dye-sensitized solar cells
摘要： In this paper, we propose new counter electrodes for applications in dye-sensitized solar cells (DSSCs). Polyaniline (PANi), tungsten trioxide (WO3), and their composite are deposited on indium thin oxide substrates using cyclic voltammetry technique and employed as counter electrodes that reached comparable and superior performances than Pt counter electrodes. These excellent results are achieved due to the high conductivity and electrocatalytic behavior of the prepared materials. Morphological, electrocatalytic, bonding structure, charge transfer properties, and photovoltaic characteristics are respectively investigated by field emission electron microscopy, cyclic voltammetry, Tafel analysis, Fourier-transform infrared spectroscopy, UV-visible spectroscopy, energy dispersive spectroscopy, electrochemical impedance spectroscopy, and current-voltage analysis. Our best DSSC that is fabricated from the WO3/PANi nanocomposite counter electrode demonstrated an efficiency of 6.78%, which is a 12.4% improvement in comparison with the Pt-based DSSC.
关键词： Counter electrode,Tungsten trioxide,Cyclic voltammetry,Composites,Dye-sensitized solar cells,Polyaniline
更新于2025-09-23 15:19:57
-
Plasmonic enhancement of photocurrent generation in Photosystem Ia??based hybrid electrode
摘要： We experimentally demonstrate that oriented assembly of red algal photosystem I (PSI) reaction center on a plasmonically active Silver Island Film (SIF) leads to strong enhancement of both fluorescence intensity and photocurrent generated upon illumination. PSI complexes were specifically attached to a monolayer of graphene deposited on the SIF layer. The results of comprehensive fluorescence microscopy point out to the critical role of the SIF layer in enhancing the optical response of PSI, as we observe increased emission intensity. Hence, importantly, the strong increase of photocurrent generation demonstrated for the biohybrid electrodes, can be directly associated with the plasmonic enhancement of optical and electrochemical functionalities of PSI. The results also indicate that the graphene layer is not diminishing the influence of the plasmonic excitations in SIF on the absorption and emission of PSI.
关键词： hybrid electrode,plasmonic enhancement,Photosystem I,graphene,Silver Island Film,photocurrent generation
更新于2025-09-23 15:19:57
-
Realizing the ultimate goal of fully solution-processed organic solar cells: a compatible self-sintering method to achieve silver back electrode
摘要： It is commonly believed that the ultimate goal of high throughput production of organic solar cells (OSCs) is the fully solution process in the fabrication. While it is highly desirable to form metal back electrodes to complete OSCs by solution process instead of high-vacuum evaporation to realize the goal, the complex solvents used in typical metal precursor solution and the post-treatment required such as high-temperature annealing will easily damage active layers and degrade OSC performances. The power conversion efficiency (PCE) for evaporation-free OSCs have only achieved 8%. Besides, there are limited studies that provide clear evidence to successfully eliminate the solvent issue brought by the directly solution-processed metal back electrode. In this work, we demonstrate a compatible self-sintering approach to connect silver nanoparticles into high-quality back electrode. The as-achieved film exhibits continuous crystal lattice, high purity, excellent conductivity and smooth morphology. Interestingly, since the self-sintering back electrode process is finished in short time and uses chemically compatible solvent, it will not degrade the organic active layer and favor high throughput OSCs fabrication. With the back electrode, the fully solution-processed OSCs achieve a PCE of 9.73% which is the highest reported PCE in evaporation-free OSCs to our best knowledge.
关键词： Solution process,minimum solvent issue,mild chemical sintering,organic solar cells,back electrode
更新于2025-09-23 15:19:57
-
A Preliminary result on the rGO functionalization as counter-electrode in dye-sensitized solar cells (DSSC)
摘要： In the effort of replacing Platinum (Pt) based counter-electrode (CE) for reducing fabrication cost in the dye-sensitized solar cell (DSSC), we synthesized rGO powder from graphite bar (commercially available) using modified Hummer’s method with an introduction of microwave irradiation. rGO was attached to the FTO surface by dissolving it in the solvent with the addition of ethyl cellulose (ES) following by two-step annealing process. rGO solution was deposited by spin coating technique with different thickness namely 1 layer rGO (A1), 5 layer rGO (A2), 10 layer rGO (A3) and 15 layer rGO (A4) followed by an annealing process, and the reference cell was assigned as A5 (using Pt). From the thin film resistance measurement using the four-probe method and conductivity calculation, the conductivity decreased as the rGO layer becomes thicker, namely from (0.58 to 0.42, 0.07 and 0.03) S/cm for A1, A2, A3, and A4 in consecutive order. From the photovoltaic measurement, we found that the utilization of rGO as a catalyst in CE increased the efficiency of the cell from 3.82% (A5) to 4.52% (A1). Furthermore, increasing the thickness of rGO layer from A1 (2.1 μm) to A2 (10.5 μm) also increased the efficiency from 4.52% to 5.89%, further increasing on the layer thickness A3 (21 μm) to A4 (31.5 μm) reduced the conversion efficiency to 2.57% and 0.33%. The highest conversion efficiency achieved for the cell with 10.5 μm thickness of CE, specifically A2. Further investigation of the influence of CE thickness and conductivity to the internal parameters of the DSSC must be done in order to gain a much better understanding of this result.
关键词： rGO,conductivity,photovoltaic measurement,DSSC,counter-electrode
更新于2025-09-23 15:19:57
-
Enhance near infrared performance of n-type vertically aligned MoS <sub/>2</sub> flakes photodetector with active p-type CZTS electrodes
摘要： Recently, MoS2 is extensively investigated as a potential 2D material to develop ultra-high responsive photodetector (PD) due to its direct band gap and high optical absorption. However, the development of broadband PD is impede due to the low light absorption of MoS2 in NIR region. Metal-semiconductor-metal (MSM) photodetector with conventional metal electrode is being used as base device structure for MoS2 PD owing its simple and cost-effective structure. However, passive metal electrodes limit light absorption and diminish the performance of photodetector. Herein, a broadband, self-powered photodetector is developed with enhanced NIR response by using n-type vertical MoS2 flakes and p-type Cu2ZnSnS4 (CZTS) active electrodes. Owing to high absorption of p-type CZTS electrode in NIR region along with MoS2 flakes in visible region and formation of p-n junction at CZTS-MoS2 flakes interface shows ultra-high responsivity of 49.31 A W?1 and external quantum efficiency of 7.6×103 (%) with enhanced performance in NIR and visible region in contrast to conventional and passive metal electrode. Moreover, proposed device showed very high detectivity 3.4×1013(2.4×1013) in NIR (visible) region. The responsivity with active CZTS based electrodes is increased upto 11-times in comparison to passive gold electrodes in NIR region at 1100 nm. Photodetetcor with p-type CZTS electrodes shows long term stability and reproducibility over more than 4000 h which clearly revealed advantage of using p-type CZTS electrode for MoS2 based next generation photodetector applications.
关键词： photodetector,CVD,self-powered,MoS2 edge-enriched,Cu–Zn–Sn–S electrode,broadband
更新于2025-09-23 15:19:57
-
Composite of lampblack and printer toner powder as a low-cost counter electrode material for dye-sensitized solar cells
摘要： Lampblack prepared by using a traditional mustard oil lamp was mixed with printer toner in the ratio of 1:1 by weight and the composite was used as a low-cost catalyst for the reduction of tri-iodide ions in dye-sensitized solar cells (DSCs). The X-ray diffraction (XRD) of the lampblack showed that the lampblack contains a carbonaceous material of graphitic form. The scanning electron microscope (SEM) images of the lampblack and printer toner revealed that the lampblack consists of a few tens of nanometer to 100 nanometer sized particles (or nanosheet) whereas the toner powder consists of micron sized particles. The adhesion test of the composite film on the counter electrode (CE) of the DSC showed that the composite film is firmly attached on the CE. The DSCs based on the composite yielded the overall light to electricity conversion efficiency of 3.20 % (Jsc = 7.90 mA/cm2, Voc = 0.667 V and FF = 0.607) compared with 4.18 % efficiency (Jsc = 8.56 mA/cm2, Voc = 0.748 V and FF = 0.654) of the DSC based on platinum when the solar cells were tested in the simulated light of 100 mW/cm2.
关键词： Counter electrode,Carbon,Printer toner,Lampblack,Dye-sensitized solar cell
更新于2025-09-23 15:19:57
-
A Hydrogen Peroxide Sensor Based on Catalytically Active Systems Rua??RuO2 Obtained by High-Speed Laser Synthesis
摘要： There is a need for simple and economical chemical sensors for monitoring the concentration of hydrogen peroxide in biological media. In this work, we demonstrate the possibility of using for this purpose catalytically active ruthenium compounds obtained by high-speed laser synthesis on the surface of a graphite electrode.
关键词： Ru–RuO2,graphite electrode,catalytically active systems,hydrogen peroxide sensor,high-speed laser synthesis
更新于2025-09-23 15:19:57
-
A novel PEDOT:PSS/SWCNH bilayer thin film counter electrode for efficient dye-sensitized solar cells
摘要： Thin platinum deposited over fluorine-doped tin oxide glass substrate is a well-known and widely used counter electrode for efficient dye-sensitized solar cells. In this paper, we investigated a potential and Pt-free bilayer thin film counter electrode based on single wall carbon nanohorn over PEDOT:PSS film. The bilayer thin film counter electrode was developed using a simple spin coat process. The results of atomic force microscope and scanning electron microscope unveil the uniform distribution of single wall carbon nanohorns over PEDOT:PSS with average size of 76 nm. The extensive electrochemical analysis demonstrated superior electrocatalytic behavior for bilayer counter electrode with lower peak-to-peak separation potential of 0.6 V, lower Rs and RCT values of 25.9 Ω and 399 Ω, and higher Jo value of 2.4 mA cm?2. The fabricated DSSC using bilayer counter electrode witnessed higher power conversion efficiency of 5.1%, compared to PEDOT:PSS (3.87%) and SWCNH (1.88%), and is almost equivalent to the platinum-based counter electrode (5.53%). The present study of bilayer counter electrode has great potential in terms of low-cost and non-platinum counter electrode for dye-sensitized solar cell applications.
关键词： Counter electrode,PEDOT:PSS,Single wall carbon nanohorn,Bilayer thin film,Dye-sensitized solar cells
更新于2025-09-23 15:19:57
-
Composite electrode of TiO2 particles with three kinds of crystal phases for significantly improved performance of dye-sensitized solar cells
摘要： A novel composite electrode of TiO2 particles with three kinds of crystal phases is fabricated for improving the dye-sensitized solar cell's performance. The photoelectric conversion efficiency of solar cell with the content of 30 wt% brookite nanocubes and 70 wt% P25 could reach 7.40%. It is obvious that brookite nanocubes are advantageous in terms of reduced charge recombination and higher voltage. On the other hand, P25 gives advantages of high surface area for dye loading and higher charge collection efficiency. This work shows a new photoelectrode design for enhanced energy conversion of DSSCs.
关键词： Composite electrode,Dye-sensitized solar cell,Brookite titania,Photoelectrochemcial property,Photovoltaic conversion efficiency
更新于2025-09-23 15:19:57
-
Enhancing fully printable mesoscopic perovskite solar cell performance using integrated metallic grids to improve carbon electrode conductivity
摘要： Carbon based Perovskite Solar cells (C-PSCs) have emerged as the most promising candidates for commercialisation in the field of perovskite photovoltaics, as they are highly stable, low cost and make use of easily scaled manufacturing techniques. However, the limited conductivity of the carbon electrode inhibits performance and represents a significant barrier to commercial application. Τhis work presents a scalable method for enhancing the carbon electrode conductivity through the integration of aluminium and copper grids into prefabricated C-PSCs. Adhered to the cells using an additional low temperature carbon ink, the metallic grids were found to dramatically reduce top electrode series resistance, leading to a large improvement in fill factor and efficiency. After grid integration, the 1 cm2 C-PSCs yielded power conversion efficiency (PCE) of 13.4% and 13% for copper and aluminium respectively, while standard C-PSCs obtained PCE of 11.3%. Performance is also significantly augmented in the case of larger-scale 11.7 cm2 modules, where PCEs went from 7.7% to 10% and 11% for aluminium and copper grids respectively. This technique offers a fast and low temperature route to high-performance, large-area C-PSCs and could therefore have serious potential for application to the high-volume manufacture of perovskite cells and modules.
关键词： Module,Carbon based perovskite solar cell,Enhanced efficiency,Low temperature carbon ink,Metallic grid,Highly conductive carbon electrode
更新于2025-09-23 15:19:57