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<i>In Situ</i> 2D Perovskite Formation and the Impact of the 2D/3D Structures on Performance and Stability of Perovskite Solar Cells
摘要： Hybrid organic and inorganic perovskite solar cells suffer from the lack of long-term stability and this negatively impacts the widespread application of this emerging and promising photovoltaic technology. In this work, aiming to increase the stability of perovskite films based on CH3NH3PbI3 and to deep understand the formation of 2D structures, solutions of alkylammonium chlorides containing 8, 10 and 12 carbons were introduced during the spin-coating on the surface of 3D perovskite films leading to the in situ formation of 2D structures. It was possible to identify the chemical formulae of some 2D structures formed by XRD and UV-Vis analysis of the modified films. Interestingly, the increase in the stability of the CH3NH3PbI3 films due to the formation of a 2D+3D perovskite network was only possible in planar TiO2 substrates. The increase on stability of the CH3NH3PbI3 films follows the surfactant molecule order: octylammonium (8C) > decylammonium (10C) > dodecylammonium (12C) chlorides > standard. We observed an increase of 17.6 % in the lifetime of the devices assembled with modified perovskite film compared to our standard device, which is directly linked to the improvement of the charge carrier lifetimes obtained from Time-Correlated Single Photon Counting (TCSPC) measurements.
关键词： Energy Conversion,Photovoltaics,Stability,2D perovskite,Perovskite Solar Cell
更新于2025-11-19 16:56:35
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Indoline and benzothiazole-based squaraine dye-sensitized solar cells containing bis-pendent sulfonate groups: Synthesis, characterization and solar cell performance
摘要： Two new symmetric squaraine sensitizers (SQTHZ and SQIND) carrying benzothiazole and indoline moieties as strong electron donating groups to inject the electron into the TiO2 nanoparticles were tested as DSSC. The theoretical calculations and absorption results show that the electron density of LUMO of SQTHZ is delocalized in the whole chromophore, leading to strong electronic coupling between SQTHZ sensitizer and the conduction band of TiO2. Furthermore, the presence of long alkyl chain with pendent bis-SO3- groups would inhibit recombination and decrease the dye aggregation. Interestingly, SQTHZ displayed UV-Vis and NIR absorption at a longer wavelength compared to SQIND. This structure feature, as well as optical properties, would lead to improved efficiency of dye-sensitized solar cell with overall better photovoltaic performance (η of 3.31 %, Jsc of 7.65 mA/ cm2, Voc of 0.59, ff of 0.71 and IPCE of 47 % at 674 nm) compared to SQIND.
关键词： Photoelectrochemical properties,DFT,Dye-sensitized solar cell,Symmetric squaraine dyes
更新于2025-11-19 16:46:39
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Improvement of Ga distribution with Sb incorporation for two-step low-temperature processing of CIGSe thin film solar cells
摘要： In this study, the application of Sb incorporation for low-temperature (≤ 450 °C) processing of Cu(In,Ga)Se2 (CIGSe) solar cells is explored. At low reaction temperature, most Ga remains at the back of the ?lm adjacent to the Mo back contact. We observed that the incorporated Sb enhanced grain size and improved device performance compared with similarly processed CIGSe ?lms made without Sb. From the energy-dispersive spectroscopy analysis and secondary ion mass spectrometry results, it was determined that elemental Ga accumulation at the back of the reacted ?lm after the two-step selenization process was signi?cantly alleviated owing to Sb incorporation. Signi?cant Sb-induced grain size enhancement was con?rmed using cross-sectional scanning electron microscopy. The electronic and optical properties of the Sb incorporated CIGSe ?lms were examined with admittance spectroscopy and ?uorescence lifetime imaging techniques.
关键词： Ga distribution,Thin ?lm solar cell,Sb incorporation,Low temperature process
更新于2025-11-14 17:28:48
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The characteristics of Cu(In, Ga)Se2 thin-film solar cells by bandgap grading
摘要： The performance of CIGSe-1 and CIGSe-2 absorber layers are compared with Eg grading such that a higher Ga content is incorporated into the back region. A wider depth range of the high-Ga region near the back of a CIGSe absorber layer can reduce its performance due to the increased formation of Ga-related defects and defect clusters. Therefore, for an Eg-graded CIGSe layer with a wider Eg on the back surface, appropriate Eg grading can improve its performance.
关键词： CIGSe,bandgap grading,defect,surface potential,solar cell
更新于2025-11-14 17:28:48
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A simple method to synthesize low-cost carbon modified TiO <sub/>2</sub> counter electrodes for high-efficiency dye-sensitized solar cells
摘要： Low cost and stable counter electrodes (CE) for dye-sensitized solar cells (DSSC) are promising for widespread use. In this paper, we report a simple and effective method to synthesize carbon modified TiO2 (TiO2/C) thin film as an abundant low cost CE for high-efficiency DSSC. The TiO2 paste layer contained organic compound was deposited on FTO glass substrate by a screen-printing method. When annealing the TiO2 paste layer at 450–550 °C under Ar flow, these organic compounds are decomposed to carbon to form carbon coated TiO2 nanoparticles. When used as a CE of DSSCs, the experimental results point out that the photoelectric conversion efficiency of DSSCs was obviously improved to near that of the referenced Pt CE. For TiO2/C is one of the cheapest and most stable materials, this TiO2/C can be used as a low cost CE for large scale high efficient DSSCs.
关键词： carbon nano materials,solar energy materials,counter electrode,dye-sensitized solar cell
更新于2025-11-14 17:04:02
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Electron Transport Improvement of Perovskite Solar Cell via ZIF-8 Derived Porous Carbon Skeleton
摘要： To improve electron transport rate of perovskite solar cell, ZIF-8 derived porous carbon skeleton layer is prepared by carbonizing the ZIF-8 thin film on conducting glass as the electron transport skeleton of perovskite solar cell. Polyvinyl pyrrolidone is added during the synthesis of ZIF-8 to reduce the particle size of ZIF-8 and decrease the carbonization temperature below 600°C. The porous structure of ZIF-8 is mainly reserved at the optimized carbonization temperature. Then TiO2 nanoparticles are deposited on the surface of porous carbon skeleton to form an electron transport layer of perovskite solar cell with the structure of FTO/ZIF-8 derived porous carbon layer/TiO2/Perovskite/Spiro-OMeTAD/Au. Due to the good conductivity of the ZIF-8 derived porous carbon skeleton, the photogenerated electron transport rate of perovskite solar cell is increased. At the same time, the porous structure of ZIF-8 derived carbon layer increases the contact area between the perovskite layer and the TiO2 layer to favor separation of photogenerated charges. Therefore, the light-to-electric conversion efficiency of CH3NH3PbI3 perovskite solar cell is enhanced from 14.25% to 17.32%.
关键词： Electron transport,Increase of contact area,Porous carbon skeleton,Good conductivity,Polyvinyl pyrrolidone,Perovskite solar cell,Metal organic frameworks
更新于2025-11-14 17:04:02
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Efficient Dye-Sensitized Solar Cells Composed of Nanostructural ZnO Doped with Ti
摘要： Photoanode materials with optimized particle sizes, excellent surface area and dye loading capability are preferred in good-performance dye sensitized solar cells. Herein, we report on an efficient dye-sensitized mesoporous photoanode of Ti doped zinc oxide (Ti-ZnO) through a facile hydrothermal method. The crystallinity, morphology, surface area, optical and electrochemical properties of the Ti-ZnO were investigated using X-ray photoelectron spectroscopy, transmission electron microscopy and X-ray diffraction. It was observed that Ti-ZnO nanoparticles with a high surface area of 131.85 m2 g?1 and a controlled band gap, exhibited considerably increased light harvesting efficiency, dye loading capability, and achieved comparable solar cell performance at a typical nanocrystalline ZnO photoanode.
关键词： bandgap energy,dye-sensitized solar cell,photovoltaic performance,Ti doped ZnO
更新于2025-11-14 17:04:02
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Fabrication of peanut-like TiO2 microarchitecture with enhanced surface light trapping and high specific surface area for high-efficiency dye sensitized solar cells
摘要： The quality of TiO2 photoelectrode is critical to fabricate high-performance dye-sensitized solar cells (DSSCs), but constructing TiO2 microstructure with high exposure reactive facets and high specific surface area is still a challenge. Herein, we present a facile route for creating a novel peanut-like (PN) anatase TiO2 microstructure with high exposed (001) facet, enhanced light trapping and large specific surface area using a one-pot hydrothermal method without fluorion assistance. With the introduction of diethylenetriamine as shape controlling agent and two-phase interface by etherification reaction of isopropyl alcohol, anatase PN TiO2 microarchitecture consisted with ultrathin nanosheets can be successfully fabricated. The obtained PN TiO2 combines the advantages of high exposed reactive (001) facets and large specific surface area (180.8 m2/g). The PN TiO2 based DSSC exhibits an outstanding photovoltaic conversion efficiency up to 9.14%, which can attribute to larger dye loading, superior light scattering capability, higher electron collection efficiency, narrower bandgap as well as efficient electron injection, together with improved electron transport and reduced charge recombination due to the unique peanut-like microstructure. Our work demonstrates the potential of PN TiO2 for improving the performance of energy storage devices.
关键词： Dye sensitized solar cell,(001) facet,Titanium dioxide,Improved electron transport,Peanut-like structure
更新于2025-11-14 17:04:02
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Grafting cobalt sulfide on graphene nanosheets as a counterelectrode for dye-sensitized solar cells
摘要： In the present work a composite counter electrode of graphene nanosheets grafted cobalt sulfide was fabricated through a facile synthetic route, in which cobalt sulfide nanoparticles were successfully grafted on the surface of graphene nanosheets. Used as a counter electrode in DSSC, a power conversion efficiency of 7.28% can be achieved. Such a result might be contributed to the facts that this counter electrode composed of graphene nanosheets grafted cobalt sulfide has a good stability and electrochemical catalytic performance toward triiodide reduction reaction.
关键词： photovoltaic performance,graphene nanosheets,cobalt sulfide,counterelectrode,Dye-sensitized solar cell
更新于2025-11-14 17:04:02
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Preparation of CoS<sub>2</sub> counter electrode on Ni sheet for QDSSCs via electrophoretic deposition of ZIF-67
摘要： To prepare counter electrode with low cost and high catalytic activity is a way to improve photovoltaic performance of quantum dot-sensitized solar cells. Here, ZIF-67 thin films are prepared on Ni sheet and FTO conducting glass substrate by electrophoretic deposition at different applied electric fields, and then CoS2/Ni and CoS2/FTO electrodes are obtained by vulcanizing the ZIF-67 thin films using thioacetamide. The prepared CoS2 thin films are characterized by the measurements of scanning electron microscope, X-ray photoelectron spectroscopy, X-ray powder diffraction and Fourier transform infrared spectra. Further, the CoS2/Ni and CoS2/FTO thin films are used as counter electrodes to fabricate quantum dot-sensitized solar cells. Photocurrent-voltage curves, electrochemical impedance spectroscopies and Tafel curves are measured to evaluate their photoelectrochemical properties. The short-circuit photocurrent value of quantum dot-sensitized solar cell based on the CoS2/Ni counter electrode is significantly improved compared with that of the cell based on the CoS2/FTO, and thus the light-to-electric conversion efficiency is increased from 1.95% to 3.24%. The enhancement mechanism of electrocatalytic activity and photovoltaic performance of counter electrode prepared on Ni sheet is analyzed to be less resistance of Ni sheet and higher charge transfer rate between counter electrode and electrolyte.
关键词： Quantum dot-sensitized solar cell,CoS2,Counter electrode,Electrophoretic deposition,Ni sheet
更新于2025-11-14 17:03:37