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Carbon electrode engineering for high efficiency all-inorganic perovskite solar cells
摘要： Carbon-based inorganic perovskite solar cells (PSCs) have demonstrated an excellent performance in the field of photovoltaics owing to their simple fabrication techniques, low-cost and superior stability. Despite the lower efficiency of devices with a carbon electrode compared with the conventional structure, the potential applications in large scale have attracted increasing attention. Herein, we employ a mixed carbon electrode inorganic PSC by incorporating one-dimensional structure carbon nanotubes (CNTs) and two-dimensional Ti3C2-MXene nanosheets into a commercial carbon paste. This mixed carbon electrode, which is different from the pure carbon electrode in showing a point-to-point contact, provides a network structure and multi-dimensional charge transfer path, which effectively increases the conductivity of the carbon electrode and carriers transport. A respectable power conversion efficiency of 7.09% is obtained through carbon/CNT/MXene mixed electrode in CsPbBr3-based solar cells.
关键词： inorganic perovskite solar cells,carbon nanotubes,carbon electrode,Ti3C2-MXene,photovoltaics
更新于2025-09-23 15:21:01
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SiO<sub>2</sub> nanoparticle-regulated crystallization of lead halide perovskite and improved efficiency of carbon-electrode based, low temperature planar perovskite solar cells
摘要： SiO2 nanoparticles were used to regulate the crystallizing process of lead halide perovskite film that prepared by the sequential deposition method, which was used in the low temperature processed, carbon-electrode basing, hole-conductor-free planar perovskite solar cells. It was observed that, after adding small amount of SiO2 precursor (1% in volume ratio) into the lead iodide solution, performance parameters of open-circuit voltage, short-circuit current and fill factor were all upgraded, which helped to increase the power conversion efficiency (reverse scan) from 11.44(±1.83)% (optimized at 12.42%) to 14.01(±2.14)% (optimized at 15.28%, AM 1.5G, 100 mW/cm2). Transient photocurrent decay curve measurements showed that, after the incorporation of SiO2 nanoparticles, charge extraction was accelerated, while transient photovoltage decay and dark current curve tests both showed that recombination was retarded. The improvement is due to the improved crystallinity of the perovskite film. X-ray diffraction and scanning electron microscopy studies observed that, with incorporation of amorphous SiO2 nanoparticles, smaller crystallites were obtained in lead iodide films, while larger crystallites were achieved in the final perovskite film. This study implies that, amorphous SiO2 nanoparticles could regulate the coarsening process of the perovskite film, which provides an effective method in obtaining high quality perovskite film.
关键词： SiO2 (61.46.Hk),crystallization(81.10.-h),low temperature(84.60.Jt),perovskite solar cell(88.40.H-),lead iodide(61.82.Rx),carbon-electrode(88.40.HJ)
更新于2025-09-23 15:21:01
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Determination of BCM-7 based on an ultrasensitive aptasensor fabricated of gold nanoparticles and ZnS quantum dots
摘要： In this study, an ultrasensitive electrochemical aptasensor for the determination of the β-casomorphin 7 (BCM-7) as a promising biomarker of autism disorder is introduced. According to the proposed strategy, a glassy carbon electrode (GCE) was modi?ed by thiourea capped-ZnS QDs (ZnS-QDs) and gold nanoparticles (AuNPs) to further immobilization the amino-aptamer (NH2-Apt) on its surface. The NH2-Apt as a receptor of the BCM-7 was attached to the embedded surface via a formation of the Au–N bonds between the AuNPs and amino groups of the Apt. The evaluation of aptasensor by various electrochemical techniques exhibited successful sensing of the BCM-7 under two broad linear concentration ranges from 1 fM to 0.6 μM with a limit of detection (LOD) down to 350 aM. Also, the performance of the aptasensor in BCM-7 detection in real human urine samples was satisfactorily investigated. These ?ndings may facilitate distinguish of this challenging disorder and help human health.
关键词： Thiourea capped-ZnS QDs,β-casomorphin 7,Glassy carbon electrode,Gold nanoparticles,Aptasensor,Autism
更新于2025-09-23 15:21:01
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Growth control and defect passivation toward efficient and low-temperature processed carbon based CsPbIBr2 solar cell
摘要： All-inorganic perovskite CsPbIBr2, has drawn much attention for photovoltaic (PV) application due to its excellent intrinsic stability. However, low device performance and high fabrication temperature still hamper its further progress in flexible application. Herein, Zn substitution has been used to improve the nucleation and growth process for low temperature processed a-phase CsPbIBr2 film. Zn incorporated CsPbIBr2 film exhibits good crystallinity, compact surface morphology and depressed defect state. Low temperature (100 and 160°C) processed carbon based CsPbIBr2 solar cells with improved PV performance have been prepared by using Zn incorporation and room deposited electron transport layer (ETL). A champion efficiency over 9% can be achieved through Zn substitution, which is one of the best values reported for the low temperature processed CsPbIBr2 solar cell without using hole transport layer (HTL). Efficiency over 5% can also be achieved for larger area (1 cm2) rigid and flexible CsPbIBr2 solar cells. These results would provide a new route for preparing high-performance and low temperature processed inorganic perovskite solar cell.
关键词： Carbon electrode,CsPbIBr2,Flexible,Solar cell,Low temperature,Inorganic perovskite
更新于2025-09-23 15:21:01
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Semiconductor α-Fe <sub/>2</sub> O <sub/>3</sub> Hematite Fabricated Electrode for Sensitive Detection of Phenolic Pollutants
摘要： Hematite (α-Fe2O3) semiconductor is an abundant and non-toxic catalyst for different (photo)electrochemical reactions. In this work, a selective p-nitrophenol sensor was developed by fabricating a thin-layer of a glassy carbon electrode (GCE) with 5% nafion coating binders onto α-Fe2O3 thin film synthesized by a simple and inexpensive process. High sensitivity including long-term stability, and enhanced linear dynamic range, electrochemical performance towards p-nitrophenol were achieved by a reliable current-voltage method. A linear calibration curve was observed over a wide range of p-nitrophenol concentrations. Very low detection limit (0.6 ? 0.02 nM), good limit of quantification (2.0 nM) and high sensor sensitivity (K = 74.1 μA?cm(cid:0) 2) are calculated based on noise to signal ratio of ～ 3 N/S. Very importantly, the detection range covers over 7 orders of magnitude concentrations, from nM to mM. Figures of merits are comparable with best reported results whilst using a very simple device configuration. We show that hematite is an excellent material for the development of chemical sensors to detect hazardous compounds for environmental safety in a broad scale of concentrations.
关键词： Environmental safety,Sensitivity,p-Nitrophenol sensor,Hematite α-Fe2O3,Glassy carbon electrode
更新于2025-09-23 15:21:01
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Enhancing fully printable mesoscopic perovskite solar cell performance using integrated metallic grids to improve carbon electrode conductivity
摘要： Carbon based Perovskite Solar cells (C-PSCs) have emerged as the most promising candidates for commercialisation in the field of perovskite photovoltaics, as they are highly stable, low cost and make use of easily scaled manufacturing techniques. However, the limited conductivity of the carbon electrode inhibits performance and represents a significant barrier to commercial application. Τhis work presents a scalable method for enhancing the carbon electrode conductivity through the integration of aluminium and copper grids into prefabricated C-PSCs. Adhered to the cells using an additional low temperature carbon ink, the metallic grids were found to dramatically reduce top electrode series resistance, leading to a large improvement in fill factor and efficiency. After grid integration, the 1 cm2 C-PSCs yielded power conversion efficiency (PCE) of 13.4% and 13% for copper and aluminium respectively, while standard C-PSCs obtained PCE of 11.3%. Performance is also significantly augmented in the case of larger-scale 11.7 cm2 modules, where PCEs went from 7.7% to 10% and 11% for aluminium and copper grids respectively. This technique offers a fast and low temperature route to high-performance, large-area C-PSCs and could therefore have serious potential for application to the high-volume manufacture of perovskite cells and modules.
关键词： Module,Carbon based perovskite solar cell,Enhanced efficiency,Low temperature carbon ink,Metallic grid,Highly conductive carbon electrode
更新于2025-09-23 15:19:57
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High performance carbon-based planar perovskite solar cells by hot-pressing approach
摘要： A simple yet effective method based on hot-pressing a free-standing carbon film onto adjacent hole transport layer (HTL) is used to fabricate carbon electrode for planar perovskite solar cells (C–PSCs). Due to the thermoplasticity of as-prepared carbon film, the conductivity of the carbon electrode is enhanced by over ten-fold and the adhesion to adjacent layer is dramatically strengthened via this hot-pressing process. By optimizing the pressing temperature, 15.3% of power conversion efficiency (PCE) is obtained for CuSCN based C–PSCs, which is 70% high than the device without heating at the same pressing pressure. The device demonstrates 93% performance retention after being stored in a humid environment (55–70%) without encapsulation over 80 days. This facile fabrication process of PSCs paves a way to facilitate commercialization of the new PV technology.
关键词： Carbon electrode,Hot-pressing,Perovskite solar cells,Conductivity,Temperature
更新于2025-09-19 17:13:59
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Carbon-based, novel triple cation mesoscopic perovskite solar cell fabricated entirely under ambient air conditions
摘要： In the past, various reports on Perovskite Solar Cells (PSCs) have presented significant results. However, due to stability issues, scale-up drawbacks and high fabrication costs, scientists turned their focus on PSCs with a simpler structure, based on carbon electrodes. In this work, we report a carbon-based PSC, embedding a novel, triple cation perovskite, created after combining Methylammonium Iodide (MAI), 5-Aminovaleric Acid Iodide (5-AVAI) and Lead(II) Iodide (PbI2) along with Phenethylammonium Iodide (PEAI) salt. In our Hole Transport Layer (HTL) free device, the perovskite was infiltrated through the conductive porous carbon cathode layer, which is deposited on top of compact/mesoporous TiO2 (c-TiO2/mp-TiO2) and mesoporous insulating ZrO2 (mp-ZrO2) layers, with all processes being carried out under ambient conditions and high relative humidity (40-60%). Finally, the perovskite films (5-AVA)x(MA)1-xPbI3 and (5-AVA)x(PEA)x(MA)1-xPbI3+x are optically/structurally characterized and the electrical performance of the corresponding devices is examined.
关键词： Triple Cation,Mesoscopic Solar Cell,Carbon Electrode,Perovskites,Ambient Conditions
更新于2025-09-19 17:13:59
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Low Temperature Processed Highly Efficient Hole-Transport-Layer Free Carbon-based Planar Perovskite Solar Cells with SnO2 Quantum Dot Electron-Transport-Layer
摘要： The use of expensive hole transport layer (HTL) and back contact along with the stability issue of perovskite solar cells have been a detrimental factor when it comes to commercialization of the technology. In addition, high-temperature and long annealing time processed electron transport layers (ETLs, e.g., TiO2) prevents the flexible solar cell application in most polymer substrate. Herein, we opted for HTL-free carbon electrodes owing to their low-cost production and superior stability in air, compared to their noble metal counterparts. In this work, we fabricate planar perovskite solar cells using low-temperature solution processed SnO2 quantum dots (QDs) as ETL, which offers significant advantages over high temperature processed ETLs due to its excellent electron extraction and hole blocking ability. In addition, by integrating a low cost and stable carbon electrode, an impressive energy conversion efficiency of 13.64% with a device architecture glass/In doped SnO2/QD-SnO2/Perovskite/Carbon under 1 sun illumination at ambient conditions have been achieved. This work paves the way to achieve fully low-temperature processed printable perovskite solar cells (PSCs) at an affordable cost by integrating the QD SnO2 ETL and Carbon electrode.
关键词： low-temperature process,planar perovskite solar cells,hole transport layer free,carbon electrode,SnO2 Quantum Dot
更新于2025-09-19 17:13:59
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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