- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
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
-
Phase Distribution and Carrier Dynamics in Multiple-Ring Aromatic Spacers-Based Two-Dimensional Ruddlesden-Popper Perovskite Solar Cells
摘要： Two-dimensional (2D) perovskites with natural multi-quantum-well structure have been reported to offer better stability compared to 3D perovskites. However, the understanding of the exciton separation and transport mechanism in 2D perovskite as well as developing more efficient organic spacers remain considerable challenges as the 2D perovskite exhibit large exciton binding energy due to quantum confinement. Here, a class of multiple-ring aromatic ammoniums, 1-naphthalenemethylammonium (NpMA) and 9-anthracenemethylammonium (AnMA), were developed as spacers for 2D Ruddlesden-Popper (RP) perovskite solar cells (PSCs). In addition to significantly enhanced stability, the device based on (NpMA)2(MA)n-1PbnI3n+1 (average n = 4) exhibits a champion efficiency of 17.25% and a high open circuit voltage of 1.24 V. The outstanding photovoltaic performance could be ascribed to the ultrafast exciton migration (within 7 ps) from 2D phases to 3D-like phases, which were confirmed by charge carrier dynamics results, leading to efficient exciton separation, charge transportation and collection. This work facilitates understanding the working mechanism of 2D PSCs deeply and offers an efficient way to further boosting their efficiency and stability by developing multiple-ring aromatic spacers.
关键词： perovskite solar cell,organic spacer,phase distribution,charge transport,two-dimensional
更新于2025-09-23 15:21:01
-
Osmium sensitizer with enhanced spin-orbit coupling for panchromatic dye-sensitized solar cells
摘要： Low-lying triplet metal-to-ligand charge transfer (3MLCT) transitions of osmium complexes induced by spin-orbit coupling (SOC) is promising to extend photocurrent response when applied to dye-sensitized solar cells. In this study, we present a newly designed osmium complex (coded CYC-33O), incorporating a 2-thiohexyl-3,4-ethylenedioxythiophene functionalized bipyridyl ancillary ligand to red-shift the absorption and enhance the absorbance of both singlet and triplet MLCT transitions. Time-dependent density functional theory (TDDFT) calculations clearly signify the reinforced 1MLCT and 3MLCT transitions of CYC-33O mainly originate from osmium to 4,4',4"-tricarboxy-2,2':6',2"-terpyridine anchoring ligand, advantaging the heterogeneous electron transfer between CYC-33O and TiO2. The device sensitized with CYC-33O exhibits the panchromatic conversion beyond 1000 nm, yielding the photocurrent density of 19.38 mA cm–2 which is much higher than those of the cells based on the ruthenium analogue (CYC-33R) and model osmium complex (Os-3) sensitizers.
关键词： dye-sensitized solar cell,triplet metal-to-ligand charge transfer (3MLCT),ruthenium complex,spin-orbit coupling (SOC),osmium complex,time-dependent density functional theory (TDDFT)
更新于2025-09-23 15:21:01
-
Efficient Perovskite Solar Cells Via Surface Passivation by a Multifunctional Small Organic Ionic Compound
摘要： Surface passivation is a proven strategy for preparing high efficiency planar perovskite solar cells. Herein, we report an effective surface passivation strategy using the multifunctional small organic ionic compound 1-Ethylpyridinium chloride (EPC) in combination with (FAPbI3)0.95(MAPbBr3)0.05. It is found that the nitrogen atom in the pyridine group forms chemical bonds with under-coordinated lead ions in the perovskite film whereby the defect density is significantly reduced. The organic groups, including ethyl and pyridine, furthermore provide higher hydrophobicity for improved moisture stability. Finally, the chlorine anions were also found to play an important role in the defect passivation while further improving the perovskite crystallinity. Detailed theoretical study confirms that the EPC is indeed a good passivation agent for multiple defects. As a result, the power conversion efficiency is increased from 19.52% to as high as 21.19% via the EPC passivation and the devices show reduced hysteresis and increased stability.
关键词： 1-Ethylpyridinium chloride,surface passivation,multifunctional,perovskite solar cell,small organic ionic compound
更新于2025-09-23 15:21:01
-
FDTD Optical Simulation for Organic Solar Cells Incorporated with Antireflection Nanostructures
摘要： To improve the performance of organic photovoltaics, we investigate an integrated device design in which the hybrid antireflection structure, composed of a surface moth-eye nanotexture and a multilayer interference film, is applied with a high-refractive-index glass substrate. The moth eye texture with a relatively long period, which is near the bandgap wavelength of organic semiconductors, is used to enhance light absorption. We perform the optical finite-difference time-domain simulation for the integrated device and find the optimal layer configuration of the multilayer interference film to maximize the photocurrent generation. In addition, we compare the absorption spectrum of the integrated device and that of the device with only moth eye coating, and show that the integrated structure is beneficial to realize a high level of absorption relatively uniformly as function of wavelength.
关键词： Optimization,FDTD,Organic solar cell,Optical simulation
更新于2025-09-23 15:21:01
-
[IEEE IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium - Yokohama, Japan (2019.7.28-2019.8.2)] IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium - GLRT Detectors for Airborne Radar Based on Knowledge-Aided and Compressive Sensing
摘要： The influences of the intermediate band (IB) filling, the absorption coefficient constants, and the IB position on the efficiency of a quantum dot intermediate band solar cell (QD-IBSC) are investigated considering the spatial variation of subbandgap generation rates. A new definition of optimal intermediate band filling is proposed. A mathematical model is developed to optimize the intermediate band solar cell (IBSC) structure under idealized conditions, which calculates the optimal ratio of the subbandgap absorption coefficient constants and the optimal position of IB.
关键词： optimal filling,conversion efficiency,Intermediate band solar cell (IBSC),IB position,absorption coefficients
更新于2025-09-23 15:21:01
-
Structural and Electrical Investigation of Cobalt-Doped NiOx/Perovskite Interface for Efficient Inverted Solar Cells
摘要： Inorganic hole-transporting materials (HTMs) for stable and cheap inverted perovskite-based solar cells are highly desired. In this context, NiOx, with low synthesis temperature, has been employed. However, the low conductivity and the large number of defects limit the boost of the e?ciency. An approach to improve the conductivity is metal doping. In this work, we have synthesized cobalt-doped NiOx nanoparticles containing 0.75, 1, 1.25, 2.5, and 5 mol% cobalt (Co) ions to be used for the inverted planar perovskite solar cells. The best e?ciency of the devices utilizing the low temperature-deposited Co-doped NiOx HTM obtained a champion photoconversion e?ciency of 16.42%, with 0.75 mol% of doping. Interestingly, we demonstrated that the improvement is not from an increase of the conductivity of the NiOx ?lm, but due to the improvement of the perovskite layer morphology. We observe that the Co-doping raises the interfacial recombination of the device but more importantly improves the perovskite morphology, enlarging grain size and reducing the density of bulk defects and the bulk recombination. In the case of 0.75 mol% of doping, the bene?cial e?ects do not just compensate for the deleterious one but increase performance further. Therefore, 0.75 mol% Co doping results in a signi?cant improvement in the performance of NiOx-based inverted planar perovskite solar cells, and represents a good compromise to synthesize, and deposit, the inorganic material at low temperature, without losing the performance, due to the strong impact on the structural properties of the perovskite. This work highlights the importance of the interface from two di?erent points of view, electrical and structural, recognizing the role of a low doping Co concentration, as a key to improve the inverted perovskite-based solar cells’ performance.
关键词： hole transport material,inverted planar perovskite solar cell,perovskite morphology,Co-doped NiOx,electrical conductivity
更新于2025-09-23 15:21:01
-
[IEEE 2019 Compound Semiconductor Week (CSW) - Nara, Japan (2019.5.19-2019.5.23)] 2019 Compound Semiconductor Week (CSW) - Structural and optical properties of GaAs film grown on a glass substrate using a large-grained Ge seed layer for solar cell applications
摘要： We fabricate a light absorbing GaAs layer on a glass substrate using a Ge seed layer formed by Al-induced crystallization. The GaAs layer grown at 520 °C exhibits the grain size of 50 μm and the internal quantum efficiency of 60% with a bias voltage of 1.0 V. These values are the largest among the GaAs layers grown on amorphous substrates at low temperatures (< 600 °C).
关键词： Al-induced crystallization,GaAs epitaxy,Thin film solar cell
更新于2025-09-23 15:21:01
-
Organic Solar Cells Efficiency Enhanced by Perylene Mono-Imide Phosphorus Salt Cathode Interfacial Layer
摘要： The composite high-performance electrode is very important for excellent photoelectric device. Interfacial modification is the dominating method to optimize electrode properties. Two easy synthesized perylene-monoimide (PMI) derived organic phosphonium bromide salts were found interestingly valuable when they were applied as cathode interlayers (CIL) in bulk heterojunction (BHJ) organic solar cells (OSCs). Using the PBDB-T:ITIC blend as bulk-hererojunction active layer in inverted device structure, the power conversion efficiency (PCE) was greatly improvement from 9.49% of the referenced device which is without phosphonium CIL to PCE 10.42% with PMI-triphenyl-phosphonium bromide (PMI-TPP) and PCE 9.87% with PMI- trimethoxylphenylphosphonium bromide (PMI-TMOPP) as CIL. Moreover, the two organic phosphonium bromide salts were also investigated by traditional device structure, the PCE was of 4.21% for bare aluminium cathode referenced device contrasted to a moderate increased PCE of 5.18% with PMI-TPP CIL or PCE of 5.05% with PMI-TMOPP CIL. Therefore, organic phosphonium bromide salt PMI-TPP is a promising candidate of CIL material in OSCs.
关键词： cathode interlayer,organophosphorus,energy conversion,electron transfer,solar cell
更新于2025-09-23 15:21:01
-
Enhanced Photosensitization by Carbon Dots Co-adsorbing with Dye on p-Type Semiconductor (Nickel Oxide) Solar Cells
摘要： In this work, the effect of carbon dots (C-dots) on the performance of NiO-based dye-sensitized solar cells (DSSCs) was explored. NiO nanoparticles (NPs) with a rectangular shape (average size: 11.4 x 16.5 nm) were mixed with C-dots, which were synthesized from citric acid (CA) and ethylenediamine (EDA). A photocathode consisting of a composite of C-dots with NiO NPs (NiO@C-dots) was then used to measure the photovoltaic performance of a DSSC. A power conversion efficiency (PCE) of 9.85 % (430 nm LED@50 mWcm-2) was achieved by a DSSC fabricated via the adsorption of N719 sensitizer with a C-dot content of 12.5 wt% at a 1.5:1 EDA:CA molar ratio. This PCE value was far larger than the PCE value (2.44 or 0.152 %) obtained for a NiO DSSC prepared without the addition of C-dots or N719, respectively, indicating the synergetic effect by the co-adsorption of C-dots and N719. This synergetically higher PCE of the NiO@C-dots-based DSSC was due to the larger amount of sensitizer adsorbed onto the composites with a larger specific surface area and the faster charge transfer in the NiO@C-dots working electrode. In addition, the C-dots bound onto the NiO NPs shorten the bandgap of the NiO NPs due to energy transfer and give rise to faster charge separation in the electrode. The most important fact is that C-dots are the main sensitizer and N719 tightly adsorbed on C-dots and NiO behaves as an accelerator of a positive electron transfer and a restrainer of the electron-hole recombination. These results reveal that C-dots are a remarkable enhancer for NiO NPs in DSSCs, and that NiO@C-dots are the promising photovoltaic-electrode materials for DSSCs.
关键词： dye-sensitized solar cell,power conversion efficiency,nickel oxide@carbon dots composite,Nickel oxide,carbon dot
更新于2025-09-23 15:21:01