- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Wrinkled titanium nitride nanocomposite for robust bendable electrodes
摘要： Electrical contacts and interconnections are critical components for all electronic devices. Bendable electrodes with enhanced electro-mechanical properties are highly desirable to develop innovative wearable electronic devices. Herein we report on a fabrication method for robust bendable coatings based on titanium nitride (TiN) thin films and silver nanowires (Ag NWs). TiN and TiN-AgNWs nanocomposites were deposited on polyethylene terephthalate (PET) substrates using a plasma enhanced pulsed laser deposition (PLD) technique. The resulting TiN coatings exhibit excellent adhesion to PET and their sheet resistance can be tuned using a dual frequency PLD process and further decreased by incorporating Ag NWs into the TiN layers. Sample sheet resistance was decreased down to values as low as 3.5 Ω/□, thanks to the formation of TiN-AgNWs nanocomposites. The electro-mechanical robustness of TiN based coatings were evaluated by four-probe resistance measurements in situ under cyclic bending tests. We show that the TiN-AgNWs nanocomposites surpass both ITO and Ag NWs coatings in terms of mechanical robustness and electrical conductivity respectively. These nanocomposites withstand high strain fatigue loading up to ε = 2.6%, keeping RS below 5 Ω/□. The data demonstrates that the incorporation of Ag NWs in TiN coatings improve the mechanical robustness, limiting the crack growth and propagation, with low optical transmittance decrease (≈11%). These results indicate that Ag NWs based nanocomposites are attractive materials for flexible electronic devices.
关键词： mechanical strain,titanium nitride,nanocomposite,ITO,flexible electrode,silver nanowires
更新于2025-09-19 17:13:59
-
High-performance counter electrode based on nitrogen-doped porous carbon nanoribbons for quantum dot-sensitized solar cells
摘要： Nitrogen-doped porous carbon nanoribbons (NPCNs) are facilely prepared by carbonization of polypyrrole (PPy) nanotubes followed by a chemical activation process. NPCN counter electrodes are subsequently fabricated by depositing NPCNs onto Ti mesh for quantum dot-sensitized solar cells (QDSCs). Electrochemical tests are carried out to evaluate the electrocatalytic performance of obtained NPCN electrode. The data of electrochemical tests suggest that the NPCN electrode has a superior electrocatalytic ability towards polysulfide (S2?/Sn2?) electrolyte regeneration reaction and displays a high stability in polysulfide electrolyte. The excellent electrocatalytic performance of NPCN electrode can be ascribed to their large surface area, 2D porous nanoribbon morphology, abundant nitrogen atom doping, which provides electrocatalytic active sites and facilitates the electrolyte diffusion. Consequently, a power conversion efficiency of 3.27% is obtained by using NPCN electrode as the counter electrode for QDSC. This efficiency is close to the QDSC assembled with commonly used PbS electrode (4.0%).
关键词： nitrogen doping,porous carbon nanoribbons,quantum dots,counter electrode,solar cells
更新于2025-09-19 17:13:59
-
High Figure-of-Merit Transparent Copper–Zinc Oxide Window Electrodes for Organic Photovoltaics
摘要： We report a copper–zinc oxide bilayer electrode supported on ?exible polyethylene terephthalate (PET) with a sheet resistance of 11. 3 (cid:127) sq?1 and average transparency of 84.6% in the wavelength range of 400–800 nm. The copper ?lm is perforated with a dense array of sub-micron diameter apertures fabricated using polymer-blend lithography, which imparts broad band anti-re?ectivity. We demonstrate proof-of-principle that it is possible to fabricate the polymer mask by dip coating which is a scalable deposition method compatible with roll-to-roll processing. During storage of the electrode at ambient temperature the ZnO layer is spontaneously doped with copper from the underlying copper ?lm and so the thin ZnO layer serves both as an anti-re?ecting layer and an excellent electron transport layer. When compared with commercially available indium tin oxide coated (ITO) plastic substrates this electrode exhibits superior stability towards bending deformation, with no change in sheet resistance after bending through a 4 mm radius of curvature 100 times. Model inverted organic photovoltaic (OPV) devices using this electrode exhibit a champion power conversion ef?ciency of ～8.7%, which is the highest reported ef?ciency to date for an OPV device using a copper based transparent electrode, outperforming identical devices using ITO coated plastic as the transparent electrode.
关键词： inverted photovoltaic devices,polymer-blend lithography,?exible,transparent electrode,copper
更新于2025-09-19 17:13:59
-
Solution-Processed Polymeric Thin Film as the Transparent Electrode for Flexible Perovskite Solar Cells
摘要： In the past decade, perovskite solar cells (PSCs) were arising as a new generation of low-cost solar technology for renewable energy generation. More than 25 % of power conversion efficiency (PCE) was reported from PSCs on the rigid indium tin oxide (ITO)/glass electrode. However, PSCs fabricated on the flexible solution-processed transparent electrode has still been a challenge to date. In this work, we report solution-processed transparent polymeric thin film as the electrode for flexible solution-processed PSCs. The solution-processed polymeric thin film exhibits superior optical transparency and decent electrical conductivity. As compared with a PCE of 16.60% from PSCs on the ITO/glass substrate, PSCs on the solution-processed transparent polymeric electrode/glass substrate exhibit a PCE of 13.36% and PSCs on the solution-processed transparent polymeric thin-film/polyethylene terephthalate flexible substrate possess a PCE of 10.16%. Systematically studies demonstrate that poor electrical conductivity of the solution-processed transparent polymeric electrode and serious interfacial charge carrier recombination are responsible for low PCEs. Nevertheless, our results demonstrate that we provide a facile route to develop flexible PSCs by utilization of solution-processed polymeric thin film as the transparent electrode.
关键词： high electrical conductivity,device performance,flexible perovskite solar cells,transparent electrode,polymeric thin-film
更新于2025-09-19 17:13:59
-
Simultaneous determination of ascorbic acid, dopamine, and uric acid using graphene quantum dots/ionic liquid modified screen-printed carbon electrode
摘要： In this work, graphene quantum dots (GQDs) and ionic liquid (IL) modified screen-printed carbon electrode (GQDs/IL-SPCE) were introduced for the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA). GQDs were synthesized by directly pyrolyzing citric acid and then dropped onto the surface of IL-SPCE, which was prepared by screen-printing the mixture of IL and carbon ink on a portable substrate. UV-Vis spectrophotometry, fluorescence spectrophotometry, transmission electron microscopy (TEM), scanning electron microscopy (SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were used to characterize the synthesized GQDs and the modified electrodes. The GQDs/IL-SPCE exhibited excellent electrocatalytic activity for the oxidation of AA, DA, and UA in the mixture solution. Moreover, the anodic peak responses of these three analytes were also resolved into three well-defined peaks. Under the optimized conditions, the linear response ranges for AA, DA, and UA were 25 - 400 μM, 0.2 - 10 μM, and 0.5 - 20 μM, respectively, with low detection limits (σ/N = 3) of 6.64 μM, 0.06 μM, and 0.03 μM, respectively. The proposed sensor exhibited high sensitivity, low cost and successfully applied for the simultaneous detection of AA, DA, and UA in pharmaceutical products and biological samples.
关键词： Graphene quantum dots,Uric acid,Dopamine,Screen-printed carbon electrode,Ionic liquid,Ascorbic acid
更新于2025-09-19 17:13:59
-
Reverse micelle facilitated synthesis of nanostructured polyaniline as the counter electrode materials in dye-sensitized solar cells
摘要： We report a reverse-micelle emulsion polymerization of nanostructured PANI using a nonionic surfactant Polyglyceryl-2-Dipolyhydroxystearate (PGPH) at various concentrations from 2% to 6% (v/v). SEM images show that the obtained morphologies are irregular agglomerates at low PGPH concentration and relatively regular granules at high PGPH concentration. FTIR and Raman spectra show that the synthesized PANI is in the form of Emeraldine salt (PANI ES) with electrical conductivity around 10?3 S cm?1. Photovoltaic current-voltage (J-V) measurements show the highest power conversion efficiency is achieved at 1.71% at 6% (v/v) of PGPH.
关键词： dye-sensitized solar cell,Counter-electrode materials,nanostructured polyaniline,emulsion polymerization,reverse micelle,polyglyceryl-2-dipolyhydroxystearate
更新于2025-09-19 17:13:59
-
Broadband InSb/Si heterojunction photodetector with graphene transparent electrode
摘要： Silicon-based Schottky heterojunction photodetectors are promising due to its compatibility with semiconductor process. However, the applications of these devices are usually limited to wavelength shorter than 1.1 μm due to the low absorption of electrode materials at infrared. In this report, silicon-based compound semiconductor heterojunction photodetectors with graphene transparent electrode are fabricated. Due to the high absorption of InSb at infrared, as well as the good transparency and excellent electrical conductivity of the graphene, as-prepared photodetector show broadband photoresponse with high performance which includes a specific detectivity of 1.9×1012 cm Hz1/2/W, responsivity of 132 mA/W, on/off ratio of 1× 105, rise time of 2 μs, 3dB cut-off frequency of 172 kHz and response wavelength covering 635 nm, 1.55 μm and 2.7 μm. This report proved that graphene as transparent electrode has a great effect on the performance improvement of the silicon-based compound semiconductor heterojunction photodetectors.
关键词： graphene,transparent electrode,heterojunction,photodetector,indium antimonide
更新于2025-09-19 17:13:59
-
Stable and durable laser-induced graphene patterns embedded in polymer substrates
摘要： The stability and durability of laser-induced graphene (LIG) patterns embedded in polymer substrates are significant for their practical application. However, most of currently reported LIG precursors are facing the dilemma of weak structural controllability, poor resistance to acid/base, or bad processability. In this work, we efficiently converted the synthesized poly(Ph-ddm) into LIG using a straightforward CO2 laser, aiming to find a potential LIG precursor with excellent durability under harsh conditions. The graphene structure of obtained LIG was confirmed by Raman spectra, scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). Results indicated that the poly(Ph-ddm)-based LIG showed a low sheet resistance of 35 ?/sq as well as a high specific surface area of 883 m2/g. And due to the superior properties of poly(Ph-ddm), the LIG patterns exhibited excellent resistance to strong acid/base solutions and high adhesion on the substrate, which ensured their stable application under severe conditions. Besides, potential application of as-prepared LIG was demonstrated in well-performed supercapacitors and electrode for water splitting in an alkaline medium. Based on the results in this work, polybenzoxazine could be a promising precursor for stable and durable LIG preparation.
关键词： electrode for water splitting,laser-induced graphene,durability,supercapacitor,Polybenzoxazine
更新于2025-09-19 17:13:59
-
All-inorganic, hole-transporting-layer-free, carbon-based CsPbIBr2 planar solar cells with ZnO as electron-transporting materials
摘要： In this paper, all-inorganic, hole-transporting-layer-free (HTLF), carbon-based CsPbIBr2 planar solar cells with zinc oxide (ZnO) as electron-transporting materials (ETMs) were studied for the first time. The reported all-inorganic, HTLF, carbon-based cesium lead iodide dibromide (CsPbIBr2) solar cells used titanium dioxide (TiO2) as ETMs, which usually required a high sintering temperature of 500 °C. Here, ZnO ETMs were annealed at 120 °C. The highest power conversion efficiency (PCE) of 7.60%, with a short-circuit current (Jsc) of 11.60 mA/cm2, an open-circuit voltage (Voc) of 1.03 V and the fill factor (FF) of 0.63, was obtained. Furthermore, the thermal and humid stabilities of the solar cells were studied. The perovskite solar cells were placed at 10% humidity and room temperature for 624 h and the PCE of perovskite solar cells only decreased by 10%. While the perovskite solar cells were placed at 80 °C and 0% humidity for 192 h, the PCE of the solar cells decreased by 4%.
关键词： Carbon electrode,Zinc oxide,All-inorganic perovskite solar cells
更新于2025-09-19 17:13:59
-
High-performance g-C3N4 added carbon-based perovskite solar cells insulated by Al2O3 layer
摘要： Carbon-based perovskite solar cell (C-PSC) has attracted extensive attention for its low cost and super stability. However, C-PSCs always suffer from much lower power conversion efficiency (PCE) compared with PSCs with noble metal cathode. Herein, we report an effective method to improve the efficiency of C-PSC by adding graphitic carbon nitride (g-C3N4) into the perovskite. The addition of g-C3N4 significantly improves the crystal quality of the perovskite, which is characterized by its larger grain size, reduced defects and flatter surface coverage. The PCE of C-PSCs was improved from 10.5% to 12.8% because of the enhancement of the crystal quality. Furthermore, to enhance the correspondingly low open-circuit voltage (Voc) caused by a high charge recombination, an insulating layer was developed by spin-coating Al2O3 on the surface of the electron transport material (ETM). It can effectively hinder the recombination of the electrons in ETM layers with holes left in perovskite layers. As a result, an optimized device with a maximum PCE of 14.34% is obtained together with a distinct improvement in voltage from 0.92 V to 1.0 V. This work increases the possibility of the commercialization of high stable C-PSCs.
关键词： Insulating layer,Carbon electrode,Perovskite solar cell,Doping
更新于2025-09-19 17:13:59