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Enhancing Light Outcoupling in OLEDs by Integration of Scattering Electrodes
摘要： Limited outcoupling efficiencies are still a big problem in organic light-emitting devices (OLEDs). In this contribution, a simple and general approach for enhancing the outcoupling efficiency of OLEDs is presented: by using a three-step process including electro-spray deposition of a sacrificial material (step i), thin metal-layer deposition (step ii), and elution of the sacrificial material (step iii), scattering metal structures can be fabricated that can be used in cavity OLEDs. The integration into green-emitting vacuum-processed OLEDs yields in an increased luminous efficiency and EQE by 30% and 27%, respectively.
关键词： OLED,Electrospray Deposition,Organic Electronics,Light Outcoupling
更新于2025-11-14 15:25:21
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Elucidation of the structural and charge separation properties of titanium-doped hematite films deposited by electrospray method for photoelectrochemical water oxidation
摘要： Elemental doping is considered to be an effective strategy to improve the photoelectrochemical (PEC) activity of hematite (a-Fe2O3) as a photoanode for water splitting, but the precise function(s) of the dopant remains unclear. In this study, we report on the structural and charge separation properties of titanium-doped hematite (Ti doped Fe2O3) films prepared by a simple electrospray technique for PEC water oxidation. The effect of Ti doping on the structure, morphology, light absorption, and electrical and photoelectrochemical properties was investigated on a-Fe2O3 films. SEM images revealed a reduction in particle sizes for 2% Ti doped a-Fe2O3, while an increase in particle size was observed for higher Ti content. XRD confirmed the presence of a-Fe2O3 without any impurity or other phases. From XPS spectra, the incorporation of Ti was confirmed in the form of Ti4+ as predominant species while no impurities from the substrate were detected. When the Ti doped Fe2O3 (2% Ti) film was used as a photoanode in a PEC cell, it delivered the best performance with a maximum photocurrent density of 1.09 mA cm-2 (at 1.8 V vs. RHE and under standard 1 sun illumination conditions (AM 1.5 G, 100 mW cm-2)), which is 2 times higher than that of the un-doped a-Fe2O3 (0.51 mA cm-2). The photoelectrode also showed a superior incident photon to current efficiency (IPCE) as compared to an un-doped a-Fe2O3. This enhancement in performance was attributed to the better charge separation and transport properties of a-Fe2O3 due to Ti doping, as revealed by an electrochemical impedance spectroscopy (EIS) analysis.
关键词： Electrospray deposition,PEC,a-Fe2O3,Ti doping,Water splitting
更新于2025-09-23 15:23:52
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Combination of Electrospray Deposition Technology of TiO2 Nanoparticles and MALDI FTICR MSI for Identification of Fingerprint Morphology and Latent Components
摘要： In fingerprint recognition, besides the physical shape information afforded by fingerprint enhancement techniques (FET), in recent years, more and more efforts are focused on researching the chemical composition of a fingerprint residue. In this work, electrospray deposition method was elaborately used to softly and homogenously deposit the physical enhancers of FET, TiO2 nanoparticles (TiO2 NPs), onto fingerprints. The results showed that this type of deposition was nondestructive to the fingerprint morphology and provided the physical shape information containing all level features. Concurrently, the TiO2 NPs demonstrated as a better matrix of matrix-assisted laser desorption ionization mass spectrometry imaging (MALDI MSI) for analysis and imaging of latent components in fingerprint, including endogenous substances like triacylglycerols (TAGs), diacylglycerols (DAGs) and cholesterol esters (CEs), and exogenous substances such as certain ingredients in hand lotion. The chemical compositions in fingerprint are closely related to individual metabolites and individual lifestyles, and identification of these compositions by Fourier transform ion cyclotron resonance (FTICR) MS is extremely beneficial for forensic analysis. The combinations of electrospray deposition technology of TiO2 NPs and MALDI FTICR MSI for identification of fingerprint morphology and latent components provide dual-modes fingerprint recognition for forensic science.
关键词： Fingerprint recognition,Electrospray deposition,MALDI-FTICR MSI,Physical enhancement,TiO2 nanoparticles
更新于2025-09-19 17:15:36
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Efficient Method of Fabricating Polymeric Solar Cells in Multilayered Configuration Using Electrospray
摘要： Electrospray deposition (ESD) for the fabrication of multilayered (ML) bulk heterojunction polymeric solar cells via direct/inverted configurations was investigated. The active layer heterojunction (P3HT/PCBM) is deposited both in single and multilayered architectures. In ML configuration, the P3HT/PCBM blend film is sandwiched between thin donor (P3HT) and acceptor (PCBM) layers. In ZnO-based inverted solar cells, ZnO film synthesized by sol–gel process was deposited on ITO substrate using spin coatinng. Solar cells were fabricated via ESD and spin coating and the device’s performance parameters were compared. Higher efficiency was obtained in the case of (ML) ESD device (direct structure). Post thermal treatment showed that ESD devices exhibit a power conversion efficiency (PCE) of 1.85% ML and 1.64% SL in direct structure while in the case of inverted structure PCEs of 1.30% ML and 0.82% SL were obtained as compared to 1.64% from the spin coated device at 120°C. The ML ESD devices have shown an overall efficiency enhancement of 13% (direct) and 58% (inverted) over the single layer (SL) ESD devices. The enhanced performance in ML devices is because there is a spatially uninterrupted pathway to the charge carrier transport towards their respective electrodes.
关键词： J–V characteristics,Polymeric solar cells,ZnO based Inverted organic solar cells,electrospray deposition,multilayered films
更新于2025-09-12 10:27:22