- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Improved performance of small molecule organic solar cells by incorporation of a glancing angle deposited donor layer
摘要： improving the photovoltaic performance directly by innovative device architectures contributes much progress in the field of organic solar cells. Photovoltaic device using different kinds of heterojunction with the given set of organic semiconductors paves the way to a better understanding of the working mechanism of organic heterojunction. Here, we report on the fabrication of a new device structure without employing extra material. A thin film of the donor material (chloroaluminum phthalocyanine (ClAlPc)) is inserted between ClAlPc:C60 bulk heterojunction (BHJ) and C60 layer by glancing angle deposition. A ClAlPc/C60 planar heterojunction co-exists with ClAlPc:C60 BHJ simultaneously in this device. Higher efficiency is obtained with this novel device structure. The effects of this additional ClAlPc layer on open-circuit voltage and fill factor in photovoltaic cells are studied. This work provides a new route to improve the device performance of organic solar cells.
关键词： glancing angle deposition,bulk heterojunction,donor layer,organic solar cells,photovoltaic performance
更新于2025-09-23 15:21:01
-
Correlation between efficiency and device characterization in MAPbI3-xClx standard perovskite solar cells
摘要： Hybrid organic–inorganic halide perovskite solar cells (PSCs) have gained exceptional attention in photovoltaic fields with an attractive yield of 25%. Characterization tools present as an important means that would help define optimized treatment parameters at an early stage of device manufacturing, instead of measuring the J (V) curves of complete solar cells. In this work, devices with planar NIP architecture ITO/SnO2/MAPbI3-xClx/HTL/Au were elaborated using one-step deposition method. The effects of annealing temperature of the ETL layer (SnO2) and various materials as an HTL layer have been studied. In parallel, X-ray diffraction, UV–visible absorption and photoluminescence were performed as well as photoluminescence spectroscopy, to analyze the active layer crystallinity, absorption properties and to probe charge transfer between perovskite and interface layers. By varying processing parameters, device efficiency could be raised from 10% up to 13.2%.
关键词： SnO2,HTL materials,Perovskite solar cells,Annealing temperature,MAPbI3-xClx,Photovoltaic performance
更新于2025-09-23 15:21:01
-
Interface passivation treatment by halogenated low-dimensional perovskites for high-performance and stable perovskite photovoltaics
摘要： The voltage loss which is mainly caused by the nonradiative recombination at the interface has played a serious negative effect on the photovoltaic performance of perovskite solar cells (PSCs). Herein, we firstly designed four halogenated layers by the way of employing different benzylammonium-based aromatic cations for high-performance devices. The introduction of halogen functional groups can not only enhance the hydrophobicity but also optimize the photovoltaic characteristics of LDP which play an important role on passivation effect of the interface between perovskite and hole transport materials (HTM) layer. The films with halogenated LDP passivation layers displayed suppressed nonradiative recombination and reduced trap density, leading to significantly reduced voltage loss. As a result, the optimal devices with 4-bromobenzylammonium-based LDP layer achieved the power conversion efficiency (PCE) as high as 21.13% with an enhanced open-circuit voltage (Voc) of 1.14 V. Under the hydrophobic and buffer action of the halogenated LDP layer, the modified devices showed outstanding long-term stability when exposed to moisture, heat and continuous UV irradiation. This work proves the enhanced passivation effect of LDP layer by regulating the chemical property of introduced organic cations for high-performance and stable perovskite photovoltaics.
关键词： Low-dimensional perovskite,Perovskite solar cells,Halogenated cations,Passivation effect,Photovoltaic performance
更新于2025-09-23 15:21:01
-
Performance and degradation assessment of large-scale grid-connected solar photovoltaic power plant in tropical semi-arid environment of India
摘要： The performance and degradation of a 1 MWp utility-scale photovoltaic (PV) system located in the tropical semi-arid climate of India is investigated based on four years of monitored data. The reference yield, final yield, system efficiency, capacity factor, and performance ratio are 4.64 h/day 6.23 h/day, 11%, 19.33%, and 74.73%, respectively, according to the standard IEC 61724. The performance is compared to other large-scale PV systems in different climate conditions. The degradation of the PV plant is quantified by using various statistical methods. These methods include the linear least-squares regression (LLS), the classical seasonal decomposition (CSD), the Holt-Winters seasonal model (HW), and the seasonal and trend decomposition using loess (STL). The degradation rate is estimated at 0.27%/year, 0.32%/year, 0.50%/year, and 0.27%/year, respectively, after 50 months operating period. The degradation accuracy analysis classifies the LLS and HW as lower accuracy methods (0.22%) than CSD (0.11%) and STL (0.15%). A comparison of the degradation of mono-Si PV systems for various locations is performed using different statistical methods. This study contributes to the improvements in the knowledge of PV degradation in the Indian climate.
关键词： Semi-arid climates,Utility-scale PV system,Photovoltaic degradation,Statistical methods,Photovoltaic performance
更新于2025-09-23 15:19:57
-
Liquid State and Zombie Dye Sensitized Solar Cells with Copper Bipyridine Complexes Functionalized with Alkoxy Groups
摘要： Copper redox mediators can be employed in dye sensitized solar cells (DSCs) both as liquid electrolyte or as solid state hole transport materials (HTMs). The solid state devices, employing copper complex HTMs can be simply obtained by solvent evaporation in liquid state devices. During this evolution, the copper complex molecules present in the electrolyte solvent slowly aggregate in the pores of the TiO2 film and they also close the gap between the TiO2 film and counter electrode. However, the crystallization of the HTM infiltrated in the mesoscopic TiO2 pores can lead to low photovoltaic performance. In order to prevent this problem, we designed two copper redox mediators [Cu(beto)2]1+ (beto=4,4’-diethoxy-6.6’-dimethyl-2,2’-bipyridine) and [Cu(beto2Ox)2]1+ (beto2Ox=4,4’-bis(2-methoxyethoxy)-6,6’-dimethyl-2,2’-bipyridine) with extended side chains. Firstly, we studied these complexes in liquid state devices in reference to the [Cu(tmby)2]2+/1+ complex (tmby = 4,4?,6,6?- tetramethyl-2,2?-bipyridine). The solar-to-electrical power conversion efficiencies for liquid state devices, were over 10% for all of the complexes by using the organic Y123 dye under 1000 Wm-2 AM1.5G illumination. However, solid state devices showed significantly diminished charge transport properties and short circuit current density values even though the crystallization is reduced.
关键词： Hole transport materials,Dye sensitized solar cells,Crystallization,Photovoltaic performance,Copper redox mediators
更新于2025-09-23 15:19:57
-
Enhanced current density of anatase TiO2 nanowire arrays by interface connection modulation in flexible quantum dot sensitized solar cells
摘要： The stability and photovoltaic conversion efficiency are very important issues for the industry application of flexible solar cells, which have been seriously limited by the interface connection of basic photo-electrodes in solar cells. Here, one-dimensional TiO2 nanowire arrays films were employed as photo-electrodes of flexible solar cells, which have modulated interface connection of the photo-electrodes by introducing small size of nanoparticles and heating pressure process. The charge generation and separation properties of photo-electrodes have been influenced, which may be attributed by the changes on band energy of small size of nanoparticles in photo-electrodes. With the improvement on the interface connection in the photo-electrodes, the charge transfer property has been effectively improved, which have exhibited a higher current density value of the solar cells, achieving photovoltaic conversion efficiency enhancement from 2.55% to 3.90%. Moreover, there have no obvious changes on the photovoltaic conversion efficiency of these flexible QDSSCs solar cells under the curling condition.
关键词： Anatase TiO2 nanowire arrays,Flexible quantum dot sensitized solar cell,Interface connection,Photovoltaic performance enhancement,Small size of nanoparticles,Heating pressure
更新于2025-09-23 15:19:57
-
Degradation and longevity of solar photovoltaic modulesa??An analysis of recent field studies in Ghana
摘要： Solar photovoltaic (PV) technology has attracted an enormous amount of attention and investment in recent years—translating to record deployment levels. This is due in part to its potential role as a cleaner energy source in the emissions-constrained development agenda that is currently being pursued at both global and national levels. Solar PV has also been propelled to the forefront of today's menu of technological options by virtue of its attributes such as scalability, fast deployment lead times, and low operating cost. Substantial investments are needed in the coming years in order to accomplish climate targets and other goals set by various countries and regional/subregional blocs. In support of informed investment decision-making and ultimately, improved outcomes of solar PV projects, there has been an uptick in studies on operational performance of fielded PV systems across the globe. These studies are, however, geographically unbalanced, and there is the need for data from under-represented regions. This paper presents a synthesis of results obtained from recent seminal field studies on PV module performance degradation in Ghana. The studies altogether analyzed sixty-five (65) modules (mono- and polycrystalline silicon) from twenty-nine (29) installations across the country (1118 module-years). The field-aged modules were characterized in situ using current-voltage (I-V) curves, visual inspection checklists, and thermal imaging. Annual module performance degradation rates (peak power) of 0.8%-7%, 0.55%-2.07%, and 1.1%-2.4% were found for modules located in various climate subcategorizations.
关键词： module,degradation,photovoltaic,performance,Ghana
更新于2025-09-23 15:19:57
-
Effect of colloid aggregation characteristic on ZnO interface layer and photovoltaic performance of polymer solar cells
摘要： ZnO as a classical n-type semiconductor oxide is widely used as the electron transport layer for high-efficiency polymer solar cells by using solution processing. To study the effect of ZnO colloid aggregation size on the morphology of ZnO interface layer and photovoltaic performance of polymer solar cells. The ZnO colloid aggregation size was adjusted by aging time, and the PTB7-Th:PC71BM solar cells with various ZnO interface layers were fabricated. The results showed that morphology, structure and property of ZnO interface layer were depended on the ZnO colloid particle size, and then determined the photoelectric performance of the PTB7-Th:PC71BM solar cell. The best performance of PTB7-Th:PC71BM solar cell with 10.21% was obtained when the ZnO precursor solution was set at 2 h aging. The ZnO interface layer with good morphology and appropriate energy level improved the mobility and lifetime of charge carrier. Moreover, it also attributed good interface contact between the ZnO layer and the PTB7-Th:PC71BM active layer, which enhanced the electron transfer and reduced the charge recombination at the interface.
关键词： ZnO colloidal particle size,ZnO interface layer,Polymer solar cells,Aging time,Photovoltaic performance
更新于2025-09-23 15:19:57
-
Terrylene Diimide-Based Middle-Low Bandgap Electron Acceptors for Organic Photovoltaics
摘要： Rylene diimides have evolved as the most investigated compounds among polycyclic aromatic hydrocarbons, due to their excellent absorption, fluorescence and outstanding electron-withdrawing ability. In this work, we present two A-D-A type electron acceptors based on terrylene diimide and investigate the impact of intramolecular nonbonding conformational locks on the molecular geometry, the solid packing arrangement as well as the photovoltaic performance. Detailed investigation demonstrates that the introduction of fluoride atoms facilitates the noncovalent interactions with sulfur elements on adjacent thiophene groups and therefore, more balanced charge transfer as well as suppressed bimolecular recombination prompt the JSC and FF, endowing the solar cells based on fluoride-substituted acceptor with a higher PCE up to 5.29%.
关键词： intramolecular nonbonding conformational locks,electron acceptors,photovoltaic performance,organic photovoltaics,Terrylene diimide
更新于2025-09-23 15:19:57
-
Positive effects in perovskite solar cells achieved using down-conversion NaEuF <sub/>4</sub> nanoparticles
摘要： In this work, NaEuF4 nanoparticles (NPs) with high dispersity and uniformity were synthesized using a hydrothermal method and introduced into the TiO2 mesoporous layer of perovskite solar cells (PSCs) for testing as high ef?ciency, downconversion materials. NaEuF4 can convert high-energy photons into low-energy photons for absorption by CH3NH3PbI3 and generation of more electron–hole pairs; we tested the hypothesis that this would extend the sunlight absorption range and improve the photovoltaic performance of PSCs. When NaEuF4 NPs were incorporated into TiO2 mesoporous layers, PSCs achieved power conversion ef?ciencies of 14.51%, which were better than those of the control PSCs. The use of NaEuF4 NPs for improving PSC photovoltaic performance, as shown herein, could encourage the greater use of solar energy.
关键词： perovskite solar cells,down-conversion,photovoltaic performance,NaEuF4 nanoparticles
更新于2025-09-23 15:19:57