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Rapid Fabrication of Thin Films for Perovskite Solar Cells
摘要： Rapid development of the thin film perovskite solar cells (PSCs) has resulted in research and development of these photovoltaic (PV) devices for automated manufacturing. Successful commercialization of PSC modules requires high throughput manufacturing with respect to the application of cheap materials and rapid cost-effective processing techniques. In this paper, several results pertinent to rapid roll-to-roll printing of the absorber and charge carrier transport thin films are presented. The successful fabrication of the processed thin films resulted in devices with 8.30% efficiency. Characterization was conducted through scanning electron microscope (SEM) and X-ray diffraction (XRD) spectroscopy which, in turn, delineated the susceptibility of our custom-made setup for successful up-scale manufacturing of PSCs.
关键词： spray coating,slot-die coating,rapid fabrication,intense pulsed light,Perovskite solar cells,thin films,roll-to-roll printing
更新于2025-09-16 10:30:52
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Spray Coated Colloidal Quantum Dot Films for Broadband Photodetectors
摘要： A technique for scalable spray coating of colloidal CdSeTe quantum dots (QDs) for photovoltaics and photodetector applications is presented. A mixture solvent with water and ethanol was introduced to enhance the adhesive force between QDs and the substrate interface. The performance of the detector reached the highest values with 40 spray coating cycles of QD deposition. The photodetectors without bias voltage showed broadband response in the wavelength range of 300–800 nm, and high responsivity of 15 mA/W, detectivity of more than 1011 Jones and rise time of 0.04 s. A large size QD-logo pattern film (10 × 10 cm2) prepared by the spray coating process displayed excellent uniformity of thickness and absorbance. The large area detectors (the active area 1 cm2) showed almost the same performance as the typical laboratory-size ones (the active area 0.1 cm2). Our study demonstrates that the spray coating is a very promising film fabrication technology for the industrial-scale production of optoelectronic devices.
关键词： quantum dots,spray coating,photodetector
更新于2025-09-16 10:30:52
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Fabrication of Spray-Coated Semitransparent Organic Solar Cells
摘要： We investigated a promising, low-cost method for fabrication of semitransparent organic solar cells by mass production. The active layer of the organic solar cells was added by spray coating with a dual action airbrush. The solution for the active layer was prepared from a rigorously blended poly(3-hexylthiophene-2,5-diyl) (P3HT) and (6,6)-Phenyl-C61 butyric acid methyl ester (PCBM) in 1,2-dichlorobenzene, and the surface morphology of the spray-coated active layer depending on the concentration of the P3HT and PCBM was investigated. The semitransparency achieved, came from the use of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) as the conductive polymer electrode. For comparison, spin-coated solar cells were also fabricated. Power-conversion efficiency and transparency was achieved from the lower cost spray-coating method that was comparable to those by the traditional spin-coating method. The best spray-coated solar cell exhibited power-conversion efficiency of 1.9% (average or 1.7%) while the best spin-coated solar cell was 2.0% (average of 1.6%), when both were measured under the AM1.5G spectrum 100 mW/cm2 light. Transmittance of the spray-coated solar cell was 52.2% while that of the spin-coated solar cell was 51.2%.
关键词： semitransparent,conductive polymer,Spray-coating,inverted,organic solar cell
更新于2025-09-16 10:30:52
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Synthesis and Characterization of CNT Composites for Lasera??Generated Ultrasonic Waves
摘要： In the last few years, extensive progress in ultrasonic wave generation by using multiwalled carbon nanotubes (MWCNTs) in combination with polydimethylsiloxane (PDMS), functional composites, has been achieved. Due to high optical absorption of MWCNTs as perfect absorbers for laser beams and the high thermal expansion coefficient of PDMS, a compact transducer for ultrasonic wave generation at higher frequency can be realized. This study reports a novel method to synthesize MWCNT–PDMS composites deposited on a glass substrate by spray coating, which is done in a short time of 2 h. The layers (0.9–32.2 μm) show low optical transmission properties of 13.9–0.0% at a wavelength of 1047 nm. Apart from using a 1% Triton-X-100 stock solution and then diluted to a 0.1% relatively nonhazardous solution, no toxic chemicals are used. The Triton-X-100 solution is not hazardous for lab handling and is a commonly used lab detergent for the treatment of biological cells. The achieved sound pressure level is 3.4 MPa with a frequency bandwidth of 9.7 MHz. These results show the potential for a fast and nontoxic production of laser-generated ultrasonic transducers, which can be used well in the field of nondestructive material testing of layered materials or in medicine with an appropriate frequency range.
关键词： laser-generated ultrasonic waves,spray-coating methods,multi-walled CNTs,photophysics,nanocomposites,nanoparticles
更新于2025-09-16 10:30:52
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Improvement of CsPbBr3 photodetector performance by tuning the morphology with PMMA additive
摘要： The optoelectrical properties of semiconductor devices are strongly related to the film morphology. Here, we found that, for CsPbBr3 thin films prepared by spray coating, the addition of polymethyl methacrylate (PMMA) can completely eliminate voids and greatly reduce the surface roughness of the as-deposited films. As a consequence, the optoelectronic properties of the photodetectors fabricated as a simple vertical structure of Au/CsPbBr3(PMMA)/ITO can be improved. With the addition of PMMA, the dark current of the photodetector is reduced at least four times, and the photodetector exhibits a favourable optical response. With the illumination ranging from 400 to 510 nm, the calculated responsivity varies from 3.70 to 5.20 A/W. A good response speed with a rise time of 6.6 ms and a decay time of 11.3 ms can be achieved. Moreover, unlike the inorganic-organic hybrid perovskite detectors, this inorganic perovskite photodetector without encapsulation shows a favourable stability with a decay of 20% after 40 days under ambient air at 20% humidity.
关键词： Photodetector,Spray coating,PMMA,Surface roughness,CsPbBr3
更新于2025-09-12 10:27:22
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Spray‐Coated Colloidal Perovskite Quantum Dot Films for Highly Efficient Solar Cells
摘要： A fully automated spray-coated technology with ultrathin-film purification is exploited for the commercial large-scale solution-based processing of colloidal inorganic perovskite CsPbI3 quantum dot (QD) films toward solar cells. This process is in the air outside the glove box. To further improve the performance of QD solar cells, the short-chain ligand of phenyltrimethylammonium bromide (PTABr) with a benzene group is introduced to partially substitute for the original long-chain ligands of the colloidal QD surface (namely PTABr-CsPbI3). This process not only enhances the carrier charge mobility within the QD film due to shortening length between adjacent QDs, but also passivates the halide vacancy defects of QD by Br? from PTABr. The colloidal QD solar cells show a power conversion efficiency (PCE) of 11.2% with an open voltage of 1.11 V, a short current density of 14.4 mA cm?2, and a fill factor of 0.70. Due to the hydrophobic surface chemistry of the PTABr–CsPbI3 film, the solar cell can maintain 80% of the initial PCE in ambient conditions for one month without any encapsulation. Such a low-cost and efficient spray-coating technology also offers an avenue to the film fabrication of colloidal nanocrystals for electronic devices.
关键词： CsPbI3,perovskite,colloidal quantum dots,spray coating,solar cells
更新于2025-09-11 14:15:04
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Spray-coated monodispersed SnO2 microsphere films as scaffold layers for efficient mesoscopic perovskite solar cells
摘要： Mesoporous SnO2 microspheres are a class of promising electron transport materials for mesoscopic perovskite solar cells, but a smooth and dense film as requested by electron transport layer is difficult to realize using the microspheres. Here, a series of monodispersed SnO2 microspheres with high specific surface area and good crystallinity are synthesized via a surfactant-free solvothermal method. These SnO2 microspheres showing small diameters of about 75, 110 and 200 nm with narrow size distribution are achieved by precisely controlling the crystal growth process. They are suitable for constructing the electron transport layers whose thickness is only about hundreds nanometers. Besides, as the microspheres easily slip off from the substrate during the conventional spin coating process, the spray coating method is exploited to prepare high quality electron transport layers. As a result, a power conversion efficiency of 16.85% is yielded by using the 75 nm sized SnO2 microspheres as the electron transport layers. This high power conversion efficiency is attributed to the fast electron transport and inhibited charge recombination. To further improve the charge transfer between the electron transport layer and perovskite layer, graphene quantum dots are added into the SnO2 microspheres, and a best efficiency of 17.08% is obtained.
关键词： Monodispersed SnO2 microspheres,Electron transport layer,Spray coating,Perovskite solar cells
更新于2025-09-11 14:15:04
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Silver Nanorings: New generation of Transparent Conductive Films
摘要： Low-cost and high yield silver nanorings with the uniform ring diameter of 15±5 μm and thickness of 120±20 nm were synthesized via a simple solvothermal method. As we know, it is the first time that solvothermal method is used to prepare silver nanorings. Herein, by using ammonium salts as additive salts in the presence of pressure inside the reactor, the repeatability and yield of nanorings extremely increased. The prepared silver nanorings easily dispersed in ethanol and coated by spray method on PET substrate to make flexible transparent conductive films (TCF). The film based on nanorings was shown better opto-electrical properties (higher transparency with lower haze) in comparison with nanowires with higher aspect ratio and lower thickness, at the same sheet resistance (Rs). These results introduce silver nanorings as an outstanding candidate for optoelectronics applications.
关键词： Metal Nanoring,Transparent conductive film,Tetrapropylammonium salts,Solvothermal method,Spray coating
更新于2025-09-10 09:29:36