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Synthesis of a carbazole-substituted diphenylethylene hole transporting material and application in perovskite solar cells
摘要： In this work, a carbazole-substituted stilbene derivatives hole transporting material, 9,9'-(ethene-1,1-diylbis(4,1-phenylene))bis(3,6-dimethoxy-9H-carbazole) (EPC) was designed and synthesized. The structure was characterized by FT-IR spectroscopy, 1H NMR, 13C NMR and MS. The glass transition temperature is 95.09°C and the 5% weight loss temperature is 423.37°C by DSC/TG analysis. Through the UV-Vis absorption spectrum combined with cyclic voltammetry, the energy level of the highest occupied molecular orbital (HOMO) of EPC and the lowest unoccupied orbital (LUMO) energy level were obtained (-5.38 eV, -2.19 eV). The energy level is well matched with methylamine lead iodine crystals. A mesoporous structure perovskite solar cell was fabricated based on the undoped EPC, and photoelectric conversion efficiency of 13.11% was obtained. After 600 hours of storage in a dark environment at 25°C and 60% relative humidity, 82% of the initial efficiency was obtained. This work provides new ideas for the development of undoped hole transporting materials.
关键词： stability,perovskite solar cell,carbazole,hole transporting material,undoped
更新于2025-09-19 17:13:59
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PMMA Thin Film with Embedded Carbon Quantum Dots for Post-Fabrication Improvement of Light Harvesting in Perovskite Solar Cells
摘要： Perovskite solar cells (PSCs) with a standard sandwich structure suffer from optical transmission losses due to the substrate and its active layers. Developing strategies for compensating for the losses in light harvesting is of significant importance to achieving a further enhancement in device efficiencies. In this work, the down-conversion effect of carbon quantum dots (CQDs) was employed to convert the UV fraction of the incident light into visible light. For this, thin films of poly(methyl methacrylate) with embedded carbon quantum dots (CQD@PMMA) were deposited on the illumination side of PSCs. Analysis of the device performances before and after application of CQD@PMMA photoactive functional film on PSCs revealed that the devices with the coating showed an improved photocurrent and fill factor, resulting in higher device efficiency.
关键词： PMMA,light harvesting,carbon quantum dots,Perovskite solar cell,down-conversion
更新于2025-09-19 17:13:59
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Introduction of LiCl into SnO2 electron transport layer for efficient planar perovskite solar cells
摘要： SnO2 has recently aroused huge attention as an electron transfer material for planar halide perovskite solar cells. Nevertheless, planar structure devices exhibit significant hysteresis behavior and low optical stability for their considerable trap states and high ultraviolet transmittance. In this study, LiCl was added to the SnO2 electron transport layer. As revealed from the results, adding LiCl could enhance the mobility of SnO2 film and promote the optical stability. Lastly, Li:SnO2 devices achieved high power conversion efficiency (PCE) of over 18% and steady-state PCE of 18.35%. Besides, they displayed prominent stability storage under dry conditions.
关键词： Tin oxide,Perovskite solar cell,Electronic transport layer,Li doping
更新于2025-09-19 17:13:59
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The Impact of Growth Temperature on Nanorod Morphology and Optical Properties for CH3NH3PbI3 Perovskite Solar Cell Device Application
摘要： Perovskite solar cells have been studied intensively by photovoltaic researchers in recent years due to their ability to absorb proper light. This research describes the CH3NH3PbI3 perovskite solar cell fabrication process. The solar cell structure is composed of ITO/ZnO seed layer/ZnO NRs/CH3NH3PbI3, with ZnO NRs as a nano shaped stem layer where perovskite crystals form. ZnO NRs have been successfully synthesized on the ITO substrate by a hydrothermal method. The ZnO seed layer is synthesized by a spin coating method in a mixture of zinc acetate dihydrate solution and ethanol. ZnO NRs were synthesized using hexamethylenetetramine (HMT) and zinc nitrate with a 1:1 molar ratio for 6 h. Some variations in growth temperature used were 80, 90 and 100 oC with a zinc nitrate concentration of 50 mM. Similarly, perovskite film devices are made through a two-step deposition using PbI2 and CH3NH3I as the main ingredients. The effects of synthesis conditions on ZnO NRs film and perovskite film devices were systematically investigated to look at the structure, morphology, optical properties of films and electrical properties of films using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), IV meter and LCR AC meter. The SEM results show that as the temperature increases, the size of the diameter and length of the rods are increased. The large rod diameter and length decrease the value of energy band gap. ZnO NRs synthesized with 50 mM concentrations at 100 oC showed the best results regarding morphology and optical properties. The film has a diameter size of 365 nm, length of the rod of 5.1 μm, and an energy band gap of 3.15 eV. The diffraction results indicate a PbI2 peak implying that it has not been converted to CH3NH3PbI3. The existence of PbI2 is suspected of opening the gap of recombination so that the current value measured by I-V meter is relatively small (0.186×10-6 μA). The low current that was generated indicates a high dielectric value and resistivity so that the light absorbing ability is less than perfect.
关键词： hydrothermal,perovskite solar cell,seed layer,ZnO nanorods
更新于2025-09-19 17:13:59
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Enhanced stability and solar cell performance via π-conjugated Lewis base passivation of organic inorganic lead halide perovskites
摘要： High power conversion efficiency (PCE) and good long-term stability of the perovskite solar cell (PSC) are two important factors on its commercial applications. Here, we propose a simple way to improve the PSC performance by adding 3,3',5,5'-azobenzene-tetracarboxylic acid (H4abtc) into the lead iodide (PbI2) precursor solution with Lewis acid-base adduct via two-step solution method. 24% enhancement of the PCE is achieved for the PSC with 2.0% H4abtc comparing with the pure PSC without H4abtc. Further research suggests that the H4abtc can passivate grain boundaries of perovskite film by reacting with the lead cation, therefore leading to good thermal stability and anti-moisture of perovskite films. The paper provides a new method to prepare a stable and efficient PSC by employing a novel Lewis base to passivate grain boundaries and gain high-quality perovskite films.
关键词： Perovskite solar cell,Additive,Two-step solution method,Lewis acid-base adduct
更新于2025-09-19 17:13:59
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A series of porphyrins as interfacial materials for inverted perovskite solar cells
摘要： Interface materials can improve the photovoltaic performance of the hybrid organic-inorganic perovskite solar cells (PSCs). Here, a series of porphyrin derivatives (metalloporphyrins: MTPPS4, M = Zn2+, Cu2+, Co2+, Ni2+; free base porphyrin: TPPS4) were developed to act as interfacial materials in PSCs. The introduction of porphyrin interlayers between PEDOT:PSS and perovskite layer in the inverted PSCs not only made energy level more matching but also improved the quality of the perovskite layer. Compared with the control device without an interlayer, the maximum power conversion efficiencies (PCE) of devices with the interlayers (in the order of ZnTPP4, CuTPP4, CoTPP4, NiTPP4 and TPP4) were increased by 23%, 25%, 21%, 17% and 13%, respectively. The highest PCE of 14.61% was based on the CuTPPS4-modified device. The porphyrins acted as the interlayers to promote carrier transport and reduce charge recombination at the interface, resulting in the increase of open-circuit voltage (VOC), short-circuit current density (JSC) and fill factor (FF).
关键词： Perovskite solar cell,Metalloporphyrin,Interface modification
更新于2025-09-19 17:13:59
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Interfacial and structural modifications in perovskite solar cells
摘要： The rapid and continuous progress in perovskite solar cells (PSCs) has drawn lots of attention from the photovoltaic research community and urges them to apply perovskite in other electronic devices such as photo detectors, light-emitting diodes, and batteries. Thanks to the diversity of the device configuration, optimization of the film deposition and exploration of material system, the power conversion efficiency (PCE) of PSCs has boosted to a certified 25.2%, making this solar cell to date the fastest advancing technology. As demonstrated by worldwide researchers, controlling the morphology and defects of the perovskite film is essential for attaining high performance of PSCs. In this regard, interface engineering has proven a very efficient way to address these issues, obtaining better charge collection efficiency and reducing recombination losses. In this review, the interfacial modification between perovskite films and charge-transport layers (CTLs) as well as CTLs and electrodes of PSCs has been widely summarized. Grain boundary (GB) engineering and stress engineering are also included since these are closely related with the improvement of device performance and stability.
关键词： grain boundaries,stress engineering,perovskite solar cell,structural,Interfacial,defects
更新于2025-09-19 17:13:59
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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
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[IEEE 2019 1st International Conference on Advances in Science, Engineering and Robotics Technology (ICASERT) - Dhaka, Bangladesh (2019.5.3-2019.5.5)] 2019 1st International Conference on Advances in Science, Engineering and Robotics Technology (ICASERT) - Effect of Solar Concentration on Performance of Perovskite Solar Cell: A detailed balance study
摘要： As a perovskite material, methylammonium lead iodide has become more popular for its flexibility, low-cost, lightweight, thin film and high power conversion capability in photovoltaic research community. In this work, we have explored the effect of solar concentration on PV performance for methylammonium lead iodide (CH3NH3PbI3) perovskite solar cell computationally. To calculate the band structure, bandgap and density of states (DOS) of CH3NH3PbI3, density functional theory (DFT) is used here. The detailed balance method is employed to figure out the effect of concentration on performance of perovskite solar cell. We have calculated performance parameters of CH3NH3PbI3 solar cell for two solar spectra AM 1.5 G and AM 1.5 D. All calculations have been performed at different solar concentrations ranging from no concentration to full concentration for both types solar spectra. It is found that the solar cell efficiency at 1.5 G spectrum is higher than 1.5 D solar spectrum at any solar concentration. These results may impact future research on perovskite solar cell.
关键词： Perovskite solar cell (PSC),solar concentration,PCE,density functional theory (DFT),detailed balance limit
更新于2025-09-16 10:30:52
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Reprint of “Oxygen-plasma processed Spiro-OMeTAD toward high performance for perovskite solar cell”
摘要： Efficient perovskite solar cell was achieved using a small hole transport material, Spiro-OMeTAD, after oxygen plasma treatment. It was demonstrated that the plasma treatment of hole transport layer for the solids state perovskite solar cell was enhanced power conversion efficiency. Reason for enhancing the cell performance of solar cell was good match of homo energy level between perovskite and Spiro-OMeTAD. It leads to transfer well hole carrier at Active/HTL interface. This study obtained highly improved performance by a current density of 25.4 mA/cm2, an open-circuit voltage of 1.02 V, and a fill factor of 60.2%, which resulted showed above 15% of cell efficiency.
关键词： Perovskite solar cell,Oxygen plasma,Plasma treatment,Aging effect
更新于2025-09-16 10:30:52