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过滤筛选
- 2019
- Dye-sensitized solar cell
- Photoelectrode
- Light scattering layer
- Transmittance
- White pigment (R902+)
- Rutile titanium dioxide
- Optoelectronic Information Materials and Devices
- Tribhuvan University
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Surfactant mediated TiO2 photoanodes and Cu2ZnSnS4 counter electrodes for high efficient dye sensitized solar cells
摘要： Highly crystallized kesterite Cu2ZnSnS4 (CZTS) nanoparticles with an energy band gap of 1.54 eV and desired elemental compositions were prepared by hydrothermal method. CZTS thin films were prepared on titanium tetrachloride (TiCl4) treated fluorine doped tin oxide (FTO) substrate by doctor blade coating method. Morphological developments of hydrothermal synthesized, sodium dodecyl sulfate (SDS) mediated, TiO2 nanostructured thin films on TiCl4 treated FTO substrate were investigated. The CZTS/FTO counter electrodes (CSs) and TiO2 nanostructured photoanodes were employed in dye sensitized solar cells (DSSCs). DSSCs device with power conversion efficiency of 6.24% have been fabricated. The TiCl4 treated CZTS CEs and SDS mediated TiO2 nanostructure photoanodes provides suitable electrodes for low cost and high efficient dye sensitized solar cells.
关键词： Thin films,CZTS counter electrode,Energy storage and conversion,Nanocrystalline materials,Dye sensitized solar cell
更新于2025-09-16 10:30:52
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Bimetallic PtSe nanoparticles incorporating with reduced graphene oxide as efficient and durable electrode materials for liquid-junction photovoltaic devices
摘要： In this work, we introduce the synthesis of PtSe alloys with the different stoichiometric ratio of Pt and Se in PtSe alloy on reduced graphene oxide (RGO). And, then the developed nanohybrid materials are employed for the first time as counter electrodes (CEs) for efficient third-generation solar cells. As a result, PtSe nanoalloys is located on the surface of RGO without any agglomerations. Furthermore, the developed materials also provide a porous three-dimensional network structure, suggesting rapid electron transfer paths. Therefore, the highest efficiency of 6.26% was obtained for a cell fabricated with Pt0$74Se0.26/RGO electrode that is due to the lowest charge-transfer resistance of 0.89 U and diffusion impedance of 0.88 U. The optimized efficiency is also higher than those of 4.98% and 4.34% for devices assembled with Pt/RGO and Se/RGO CEs, respectively. This work presents a general strategy for designing and fabricating porous PtSe alloy/RGO CEs for energy conversion devices.
关键词： PtSe/graphene,Hybrid materials,Counter electrode,Dye-sensitized solar cells
更新于2025-09-16 10:30:52
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Effects of interface adsorption configurations on dye-sensitized solar cell performance at the stoichiometric and defected TiO2 anatase (101): a theoretical investigation
摘要： Interfacial adsorption configuration plays a crucial role in influencing on the photovoltaic performance of dye-sensitized solar cells (DSSCs), and thus, theoretical investigations are needed to further understand the impacts of different absorption configurations on stoichiometric and defected TiO2 (101) surface on the short-circuit photocurrent density (JSC) and open-circuit voltage (VOC) of DSSCs. Herein, calculations of isolated dyes and dye/TiO2 systems were performed on the donor-π bridge-acceptor (D-π-A) type porphyrin sensitizers bearing different donor moieties and a α-cyanoacrylic acid anchoring group (T1-3), using DFT and TD-DFT methods. And, for the first time, comparative analysis on interfacial electron injection (IET) and density of states (DOS) were carried out on dye/TiO2 system with stoichiometric and defected surface to provide a further insight into the electronic factors in influencing the efficiency of DSSC, which can well explain the experimental variation trends of JSC and VOC. It turned out that attachment via the carboxyl and cynao groups in a tridentate binding mode can result in more efficient IET rates and an upshifted conduction band in comparison with the bidentate attachment. More interestingly, we found that the adsorption configuration on defected surface containing O2c vacancy induced more upshifted CBM and relative fast IET, especially for the bonding mode through two O atoms of carboxyl group.
关键词： interfacial electron transfer,density of states,dye-sensitized solar cells,adsorption configuration,TiO2
更新于2025-09-16 10:30:52
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Device characteristics and material developments of indoor photovoltaic devices
摘要： Indoor photovoltaics (IPVs), which convert the indoor light energy into direct electricity, have attracted research attention due to their potential use as an excellent amicable solution of sustainable power source to drive low-power-needed sensors for the internet of things (IoT) applications. Our daily life adopts various indoor light sources, such as indirect sunlight, incandescent lamps, halogen lamps, ?uorescent lamps, and LED bulbs, that typically deliver lower light intensity (200–1000 lux) as compared to that of sun light (～100,000 lx). In this review, we ?rstly classi?ed the indoor lights depending on their working mechanism and resulting emission spectrum. Because the indoor light intensities are rather low that may lead to overestimate/underestimate the power conversion e?ciency (PCE) of IPV devices, then, the cautious points for correctly measuring the indoor light intensity as well as the device characteristics are summarized. Several light sources with various light intensities are reported so far, but for lack of common or standard calibration meter that induces a ambiguity in PCE determination, so we suggest/propose to use a universal LED lux meter with NIST-traceable calibration (e.g. Extech LT40-NIST) and also recommended the device results are expressed in maximum power point Pmax along with PCE values. It is generally believed that the materials play key roles on the performance of the IPV devices. Since the indoor light intensity is much weaker as compared to that of outdoor irradiation, the typical inferior photo-stability of organic materials under sunlight may not be as crucial as we considered to harvest indoor light energy, opening a great room for organic IPV material developments. In principle, all materials for outdoor PVs may also be useful for IPVs, but the fundamental material requirement for IPVs which needs su?ciently covering the absorption range between the 350–700 nm with high molar extinction coe?cient should be primarily concerned. In order to get the thorough knowledge of materials for achieving better e?cient IPVs, the reported IPVs were collected and summarized. According to these reports, the materials utilized for IPVs have been classi?ed into two major groups, inorganic and organic materials, then divided them into several sub-classes, including (1) silicon and III-V semiconductor photovoltaics, (2) dye-sensitized photovoltaics, (3) organic photovoltaics, and (4) perovskite-based photovoltaics, depend on their structural nature and device working principle. For every individual class, the structure-property-e?ciency relationship of the materials was analyzed together with the highlights on the best e?ciency material, challenge and perspective. For inorganic IPV materials, III-V semiconductor GaAs-based IPVs performed a very impressive PCE (28%). For dye sensitizers, there are more ?exible strategies to modulate the absorption pro?les of organic materials. A high e?ciency dye-sensitized solar cell (DSSC)-based IPV with a PCE up to 32% has been successfully realized with co-sensitized dyes. For organic solar cell (OSC)-based IPVs, fullerene-based acceptors are advantageous for their well-matching desired absorption range and superior electron transport features. A recent OSC-based IPV with the active layer composed of dithienobenzene-based donor and fullerene acceptor was reported to deliver a PCE of 28%. Among these emerging photovoltaic materials, it is no doubt that perovskites (e.g. CH3NH3PbI3) are superior for solar energy conversion due to the crystallinity for good charge transport, better spectral coverage and the low exciton binding energy. Until very recent, a perovskite-based IPV with a PCE of 35% was reported with good stability by the incorporation of an ionic liquid for e?ectively passivating the surface of the perovskite ?lm, indicating the bright prospect of perovskite for IPV application. Overall, the review on these reports implies the essential criteria of materials suitable for IPVs that may trigger new ideas for developing future champion materials for various devices and the realization of practical IPV applications.
关键词： Organic solar cells,Dye-sensitized solar cells,Silicon and III-V semiconductors,Perovskite materials,Power conversion efficiency,Internet of Things,Organic materials,Indoor photovoltaics
更新于2025-09-16 10:30:52
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Improving the performance of dye-sensitized solar cells by incoporating a novel ZnO:Al charge injection layer
摘要： In this study, the e?ect of integrating a ZnO:Al (AZO) charge injection layer into dye-sensitized solar cells (DSSCs) is investigated. The AZO charge injection layer was deposited using a low-cost sol-gel deposition method directly onto ?uorine-doped tin oxide (FTO) conducting glass just before TiO2 photoanode coating. The structural and optoelectronic properties of AZO charge injection layer are then investigated as a function of the precursor concentration. The integration of AZO charge injection layer leads to the improvement of power conversion e?ciency (PCE) by preventing the electrolyte coming in contact with FTO and improving charge injection from the charge AZO layer. It was found that there is an optimum AZO precursor concentration for charge injection layer deposition and DSSCs fabricated using higher concentration resulted in reduced photovoltaic performance due to reduced light transparency, whilst charge injection layer deposited at lower precursor concentration were found to reduce DSSC performance due to insu?cient converage.
关键词： Aluminium doped zinc oxide,Dye sensitized solar cells,Injection layer,Sol-gel
更新于2025-09-16 10:30:52
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Rapid Room-Temperature Synthesis of Mesoporous TiO2 Sub-Microspheres and Their Enhanced Light Harvesting in Dye-Sensitized Solar Cells
摘要： Submicron sized mesoporous spheres of TiO2 have been a potential alternative to overcome the light scattering limitations of TiO2 nanoparticles in dye‐sensitized solar cells (DSSCs). Currently available methods for the growth of mesoporous TiO2 sub‐microspheres involve long and relatively high temperature multi‐stage protocols. In this work, TiO2 mesoporous sub‐microspheres composed of ~5 nm anatase nanocrystallites were successfully synthesized using a rapid one‐pot room‐temperature CTAB‐based solvothermal synthesis. X‐Ray Diffraction (XRD) showed that the grown structures have pure anatase phase. Transmission electron microscopy (TEM) revealed that by reducing the surfactant/precursor concentration ratio, the morphology could be tuned from monodispersed nanoparticles into sub‐micron sized mesoporous beads with controllable sizes (50–200 nm) and with good monodispersity as well. The growth mechanism is explained in terms of the competition between homogeneous nucleation/growth events versus surface energy induced agglomeration in a non‐micelle CTAB‐based soft templating environment. Further, dye‐sensitized solar cells (DSSCs) were fabricated using the synthesized samples and characterized for their current‐voltage characteristics. Interestingly, the DSSC prepared with 200 nm TiO2 sub‐microspheres, with reduced surface area, has shown close efficiency (5.65%) to that of DSSC based on monodispersed 20 nm nanoparticles (5.79%). The results show that light scattering caused by the agglomerated sub‐micron spheres could compensate for the larger surface areas provided by monodispersed nanoparticles.
关键词： CTAB,light scattering,surfactant,titanium dioxide,dye‐sensitized solar cells,anatase
更新于2025-09-16 10:30:52
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Aloe vera-peel derived porous carbon integrated Co/Mn-oxide based nano-hybrids: An efficient electrocatalyst in advanced photovoltaics
摘要： We propose a facile strategy to synthesize highly electrocatalytic active nanohybrids by the integration of aloe vera-peel derived porous carbon into manganese-based and cobalt/manganese-based oxides. These nanohybrids exhibit unique three-dimensional porous network structures and possess high surface areas, providing numerous catalytic sites and multiple rapid electron transfer channels. In this work, the as-synthesized nanohybrids are used as accelerants for tri-iodide reduction in dye-sensitized solar cells, resulting in attractive cell efficiency and superior electrochemical stability. The solar cell with low-cost bio-based carbon integrated cobalt/manganese-oxide counter electrode exhibits higher photovoltaic efficiency than that of platinum electrode (7.01% vs. 6.44%). In addition, hybrid catalyst loaded counter electrodes also demonstrate long-term electrochemical stability in I3?/I? electrolyte, retaining 97% of its initial efficiency (6.83%/7.01%) in working cell, after going through multiple cyclic voltammetry scans. The utilization of synergistic effects of high performance constituents and controlled morphology is a key strategy to intensify the catalytic activity, electrochemical stability, and power conversion efficiency in advanced photovoltaics.
关键词： Dye-sensitized solar cell,Bio-based porous carbon,Cobalt manganese oxide,Morphology transformation,Electrocatalytic accelerants
更新于2025-09-16 10:30:52
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Organosoluble Starch-Cellulose Binary Polymer Blend as a Quasi-Solid Electrolyte in a Dye-Sensitized Solar Cell
摘要： This work is a pioneer attempt to fabricate quasi-solid dye-sensitized solar cell (QSDDSC) based on organosoluble starch derivative. Rheological characterizations of the PhSt-HEC blend based gels exhibited viscoelastic properties favorable for electrolyte fabrication. From amplitude sweep and tack test analyses, it was evident that the inclusion of LiI improved the rigidity and tack property of the gels. On the other hand, the opposite was true for TPAI based gels, which resulted in less rigid and tacky electrolytes. The crystallinity of the gels was found to decline with increasing amount of salt in both systems. The highest photoconversion e?ciency of 3.94% was recorded upon addition of 12.5 wt % TPAI and this value is one of the highest DSSC performance recorded for starch based electrolytes. From electrochemical impedance spectroscopy (EIS), it is deduced that the steric hindrance imposed by bulky cations aids in hindering recombination between photoanode and electrolyte.
关键词： dye-sensitized solar cell,phthaloyl starch,rheology,hydroxyethyl cellulose,quasi-solid electrolyte
更新于2025-09-16 10:30:52
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Ni3S2@MWCNTs films for effective counter electrodes of dye-sensitized solar cells
摘要： Composite films nickel sulfide (Ni3S2) nanoparticles were grown on multiwall carbon nanotubes (MWCNTs) and in situ coated onto conducting glass substrates by the hydrothermal process at 170 °C. These Ni3S2@MWCNTs films were applied for counter electrodes (CEs) of dye-sensitized solar cells (DSSCs). In this work, nanostructure, crystalline structure, electrochemical activities and electron-charge transfer resistance of CEs were studied. In addition, the effective surface areas of CEs were analyzed and discussed as well. The power conversion efficiency (PCE) enhancement of up to 7.48%, compared with that of Ni3S2-DSSC, was demonstrated for a Ni3S2@MWCNTs DSSC.
关键词： Counter electrode,Ni3S2,Dye-sensitized solar cell,Hydrothermal method,Multiwall carbon nanotubes
更新于2025-09-16 10:30:52
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Platinum leaf counter electrodes for dye-sensitized solar cells
摘要： In this study, a platinum (Pt) leaf was introduced as a counter electrode (CE) with thickness of 100 nm in dye-sensitized solar cells (DSCs). Fundamental characteristics were investigated and compared with Pt leaf, Pt plate, and sputtered-Pt as the CEs. The power conversion efficiencies of DSCs with a Pt leaf as the CEs were as high as 4.78%, which is higher to those of DSCs with Pt plate and sputtered-Pt as the CEs (4.11% and 4.40%, respectively). In contrast to other CEs, Pt leaf features a large surface area. This implies that Pt leaf serves as an active CE and can be a good candidate for DSCs.
关键词： dye-sensitized solar cells,platinum leaf,power conversion efficiency,counter electrode
更新于2025-09-16 10:30:52