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Highly transparent nickel and iron sulfide on nitrogen-doped carbon films as counter electrodes for bifacial quantum dot sensitized solar cells
摘要： Semiconductors are widely used as counter electrodes in quantum dot-sensitized solar cells. However, many counter electrode materials have poor conductivity and require tedious post-treatment procedures. Here, our groups develop a highly transparent MS2@N-doped C film materials (M = Ni, Fe) derived from layer-by-layer self-assembly of a M-TCPP film as a counter electrode in bifacial CdS/CdSe quantum dot-sensitized solar cells. Devices based on the MS2@N-doped C films exhibited higher respective front- and reverse-side power conversion efficiencies (i.e., 4.57% and 3.98% for the NiS2@N-doped C film and 3.18% and 2.63% for the FeS2@N-doped C film) than those of Pt-based devices (2.39% and 1.74%). We attribute the outstanding catalytic activity and excellent stability of the MS2@N-doped C film materials to the homogeneous sulfides within the transparent nitrogen-doped C film, as confirmed by electrochemical analyses, including cycle voltammetry, impedance spectroscopy and Tafel-polarization measurements.
关键词： Nitrogen doped C film,Metal sulfide,Quantum dot-sensitized solar cells,Counter electrode
更新于2025-09-19 17:13:59
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New dielectric/metal/dielectric electrode for organic photovoltaic cells using Cu:Al alloy as metal
摘要： Given the rapidly increasing demand for flexible and inexpensive optoelectronic devices, it is necessary to find a substitute for ITO (Indium Tin Oxide). Among the considered alternatives, we have chosen in the present work Dielectric/Metal/Dielectric (D/M/D) trilayer structures deposited under vacuum. In these D/M/D structures, when Ag is the metal, highly performing and stable Transparent Conductive Electrodes (TCEs) are obtained. When Ag is replaced by Cu, which is far less expensive, results are not similar due to the tendency of Cu to diffuse into the transition metal oxides. Therefore we improve the stability of the new TCEs by using the Cu alloy Cu:Ag in ZnS/M/WO3 structures. The best results were obtained when M = Cu:Ag (16 nm)/Ag (1 nm). Flexible and quite stable TCEs were obtained. These new TCEs are conductive and transparent with a figure of merit of 6.5 x 10-3?-1 and a quite small Root Mean Squared Roughnessis (RMS = 1.1 nm). Therefore, they were introduced as anode in organic photovoltaic cells (OPVs). In the same time, ZnS/Ag/TiO2 TCE were probed. These ZnS/Ag/TiO2 structures were transparent and conductive with optical and electrical performances similar to those of ITO, but, when used as anode, the OPVs performances were limited by the presence of Ag at the surface of the structures. In the other hand, the results obtained with ZnS/M/WO3 structures were very promising with an open circuit voltage, Voc, and a short circuit current, Jsc, whose values are slightly higher than those obtained with ITO. Nevertheless the fill factor FF is sensibly smaller, which is attributed to the presence of some Cu at the surface of the electrode.
关键词： Cu:Ag alloy,Transparent conductive electrode,organic photovoltaic cells,dielectric-metal-dielectric structures,Indium free electrode
更新于2025-09-16 10:30:52
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Electrode buffer layers via networks of polythiophene/polyaniline bottlebrushes and carbon nanotubes in organic solar cells
摘要： A new p-type electrode buffer layer (EBL) material was developed by the networks composed of multi-walled CNTs (MWCNTs) and poly(3-thiophene ethanol) (P3ThEt)-g-polyaniline (PANI) bottlebrush copolymers. The nanocomposites of CNT:P3ThEt-g-PANI were prepared in three different thicknesses (5, 15, and 25 nm) and employed as hole transport layer (HTL) in poly(3-hexylthiophene) (P3HT):phenyl-C71-butyric acid methyl ester (PC71BM) solar cells. A trade-off was detected between the sheet resistance and transmittance by elevating the HTL thickness for both pure CNT and CNT:P3ThEt-g-PANI nanocomposites. The CNT:P3ThEt-g-PANI thin films, in particular with an optimal thickness of 15 nm, were the turning points for equilibrating the film thickness, transmittance, surface roughness, and sheet resistance values. The smoothest thin films of CNT:P3ThEt-g-PANI with the thickness of 15 nm, the transmittance of 85–89%, and the sheet resistance of 5.6 × 104 Ω/sq reflected the best results of 12.85 mA/cm2, 60.7%, and 0.68 V. Hence, a maximum power conversion efficiency (PCE) of 5.30% was acquired among all solar cells fabricated in current work. After peaking at 15 nm, the second group of proper results was recognized in CNT:P3ThEt-g-PANI (25 nm)/P3HT:PC71BM photovoltaics (10.37 mA/cm2, 49.0%, and 0.62 V). The PCE of 3.15% for this system was even greater than the ideal performance (= 2.94%) detected in the pure CNT (15 nm)/P3HT:PC71BM solar cells.
关键词： Polyaniline,Electrode buffer layer,Carbon nanotubes,Organic solar cells,Polythiophene
更新于2025-09-16 10:30:52
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Preparation of Transparent Conductive Electrode via Layer-By-Layer Deposition of Silver Nanowires and Its Application in Organic Photovoltaic Device
摘要： Solution processed transparent conductive electrodes (TCEs) were fabricated via layer-by-layer (LBL) deposition of silver nanowires (AgNWs). First, the AgNWs were coated on (3-Mercaptopropyl)trimethoxysilane modified glass substrates. Then, multilayer AgNW films were obtained by using 1,3-propanedithiol as a linker via LBL deposition, which made it possible to control the optical transmittance and sheet resistance of multilayer thin films. Next, thermal annealing of AgNW films was performed in order to agent their electrical conductivity. AgNW monolayer films were characterized by UV-Vis spectrometer, field emission scanning electron microscopy, optical microscopy, atomic force microscopy and sheet resistance measurement by four-point probe method. The high performances were achieved with multilayer films, which provided sheet resistances of 9 ?/sq, 11 ?/sq with optical transmittances of 71%, 70% at 550 nm, which are comparable to commercial indium tin oxide (ITO) electrodes. Finally, an organic photovoltaic device was fabricated on the AgNW multilayer electrodes for demonstration purpose, which exhibited power conversion efficiency of 1.1%.
关键词： silver nanowires,layer by layer deposition,organic photovoltaics,transparent conductive electrode
更新于2025-09-16 10:30:52
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Hierarchically Anatase TiO2 microspheres composed of tiny octahedra used as mesoporous layer in perovskite solar cells
摘要： In this study, Hierarchically Anatase TiO2(HAT) Microspheres composed of tiny octahedra was prepared by hydrothermal method and introduced to perovskite solar cells(PSCs). Self-assembly linear units can provide better electronic transmission path in HAT.A power conversion efficiency of PSC based on HAT is 15.42%. Surface modification of the electron transport layer in perovskite solar cells has been proven to be one crucial strategy to improve the power conversion efficiency. Nb2O5, MgO and Al2O3 were deposited on the HAT surface, respectively. All of HAT films exhibit bigger electrons life span and suppressed charge recombination at the interface of TiO2 /perovskite films in the modified devices as well. As result, a campion power conversion efficiency of PSC based on Nb2O5@HAT could reach to 17.10%
关键词： Hierarchically Anatase TiO2,oxide electrode,Perovskite solar cell,Surface modification
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Composite transparent conductive electrode for printed electronic devices
摘要： The new transparent conductive electrode consists of three materials: silver nanowires (AgNWs), zinc oxide nanoparticles (ZnO), and reduced graphene oxide (rGO). We prepared a silver nanowire electrode by spin coating a silver nanowire solution on a glass substrate，the zinc oxide nanoparticles covered the silver nanowire grid and filled the gap of silver nanowire, which enhanced the adhesion of silver nanowire to the substrate. The outermost reduced graphene oxide provides protection for the material and improves the stability of the electrode in an air environment. The AgNWs/ZnO/rGO composite electrode prepared has a sheet resistance of about 9.96 ?/sq and a light transmittance of 71% (T550), which has good photoelectric properties. Experimental results show that the composite electrode has long-term stability in air.
关键词： composite electrode,silver nanowire,reduced graphene oxide,zinc oxide
更新于2025-09-16 10:30:52
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Hierarchical NiO@NiS@graphene nanocomposite as a sustainable counter electrode for Pt free dye-sensitized solar cell
摘要： Recent studies in DSSC has been concentrated on developing counter electrode with low cost materials which has high power conversion efficiency, as well as high catalytic property. NiO has been studied as CE for high short circuit current in DSSC because of its wide bandgap. In this work nickel oxide@nickel sulfide@graphene (NiO@NiS@G) nanocomposite was synthesized by hydrothermal method. Structural composition of NiO@NiS@G nanocomposite was revealed by X-ray diffraction (XRD) and confirm the formation of NiO@NiS@G nanocomposites. Raman spectroscopy was the most effective tool for the analysis of carbon-based materials. The D band and G band of Raman spectrum confirmed the conversion of graphene (G) from graphene oxide (GO). X-ray photoelectron spectroscopy (XPS) shows the presence of Ni, O, C and S atoms in the composition. The morphology analysis revealed the formation of NiO@NiS nanoplates anchored on the surface of the graphene sheets. The as-synthesized materials were coated on FTO (fluorine-doped tin oxide) substrate by spray coat technique and their catalytic properties were studied. The electrochemical activity (peak separation Epp) of NiO@NiS@G nanocomposite (391 mV) was high compared to NiO@NiS (496 mV) and exhibited excellent stability compared with NiO@NiS. Further, the charge transfer resistance of commercial Pt, NiO@NiS@G, and Nio@NiS has been measured by Electrochemical Impedance Spectroscopy (EIS), where corresponds resistance values of CEs are 15.7, 23.2, and 36.8 Ω, respectively. The efficiency of a solar cell with NiO@NiS@G is 2.10 % where it high compared with NiO@NiS (1.68%).
关键词： NiO@NiS@G,Counter electrode,Electrochemical activity,graphene,nanoplates
更新于2025-09-16 10:30:52
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Synergy effect of carbon nanotube and graphene hydrogel on highly efficient quantum dot sensitized solar cells
摘要： Carbon based composite counter electrodes (CEs) containing metal sulfides have shown excellent catalytic activity in quantum dot sensitized solar cells (QDSCs), but the series resistance of the device is still greatly larger than that of brass based CEs of CuxS/brass. In this work, carbon nanotubes (CNTs) are incorporated into the binary system of graphene hydrogel (GH) and copper sulfide (CuS) during gelation to form CNT-GH-CuS composite CEs. Results show that the ternary CEs exhibit greatly higher conductivity than that of binary CNT-CuS and GH-CuS CEs, and the series resistance dramatically drops from ~ 3 to 0.79 ? which is similar to that of CuxS/brass CEs. Due to the improved conductivity, catalytic activity and intimate contact with substrate, the assembled Zn-Cu-In-Se QDSCs receive a record power conversion efficiency of 14.02%.
关键词： Counter electrode,copper sulfide,solar cell,carbon nanotube,graphene hydrogel
更新于2025-09-16 10:30:52
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One-Pot Synthesis of Flower like FeS2 as Counter Electrode for Quantum Dot Sensitized Solar Cells
摘要： Counter electrodes plays significant role in electron transport in photovoltaics and an ideal counter electrode should have high electrocatalytic activity, cost effective, high performance stability. With this concern, an easy fabrication process is also necessary for quantum dot-sensitized solar cells (QDSSCs). Iron disulfide (FeS2) is an earth-abundant, non toxic and low-cost material and We report a facile one-pot hydrothermal method for the growth of flower like FeS2, which is used as a high efficient counter electrode for QDSSCs. FESEM images show the flower like morphology and XRD pattern confirms the formation of iron pyrite phase. UV-visible absorption spectrum showed absorption in the visible region. QDSSC with FeS2 nanoflower as counter electrode exhibited a power conversion efficiency of 1.174 % with a Voc of 1.368.
关键词： Counter electrode,FeS2,Nanoflower,Hydrothermal,QDSSCs
更新于2025-09-16 10:30:52
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Palladium Nanocubes Synthesized Via - Metal Chloride Route for Dye Sensitized Solar Cells (DSSC) Applications
摘要： Palladium nanocubes (Pd NCs) were synthesized using metal chloride route. The morphology of the electrode is observed by scanning electron microscopy and transmission electron microscopy. Energy dispersive spectra analysis confirms the palladium material. The phase purity of the synthesized palladium nanocubes was investigated through X-Ray Diffraction (XRD) analysis and the obtained pattern was compared with JCPDS data. The Photovoltaic performance of the DSSC with palladium counter electrode is being investigated.
关键词： Counter electrode,Catalytic activity,Corrosion
更新于2025-09-16 10:30:52