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Dual-protection Strategy for High-efficiency and Stable CsPbI2Br Inorganic Perovskite Solar Cells
摘要： Large opening circuit voltage (Voc) loss and poor moisture stability have significantly hindered the progress of inorganic perovskite solar cells (IPSCs). Here, we report a dual-protection strategy via incorporating monomer trimethylolpropane triacrylate (TMTA) into CsPbI2Br perovskite bulk and capping surface with 2-thiophenemethylammonium iodide (Th-NI) to ameliorate above issues. Benefiting from growth control and effective suppression of both bulk and surface recombination, the resulted devices show a great improved efficiency from 12.17% to 15.58% with a champion Voc of 1.286 V. Besides, dual-protection strategy endows films with promoted moisture tolerance and the non-encapsulated device remains 83.4% of its initial efficiency after aging at 25% relative humidity for 1540 h. More importantly, the target device shows good operational stability and reveals the unfallen efficiency after maximum power point tracking for 350 h at 45 °C. Our work offers a feasible method to fabricate efficient and stable CsPbI2Br IPSCs for future commercialization.
关键词： High-efficiency,CsPbI2Br,Stable,Dual-protection strategy,Inorganic perovskite solar cells
更新于2025-09-16 10:30:52
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Solution processed Sb2S3 planar thin film solar cell of conversion efficiency 6.9% at open circuit voltage 0.7 V achieved via surface passivation by SbCl3 interface layer
摘要： Interfaces in Sb2S3 thin film solar cells strongly affect their open-circuit voltage (VOC) and power conversion efficiency (PCE). Finding an effective method of reducing the defects is a promising approach for increasing the VOC and PCE. Herein, the use of an inorganic salt SbCl3 is reported for post-treatment on Sb2S3 films for surface passivation. It is found that a thin SbCl3 layer could form on the Sb2S3 surface and produce higher-efficiency cells by reducing the defects and suppressing nonradiative recombination. Through density functional theory calculations, it is found that the passivation of the Sb2S3 surface by SbCl3 occurrs via the interactions of Sb and Cl in SbCl3 molecules with S and Sb in Sb2S3, respectively. As a result, incorporating the SbCl3 layer highly improves the VOC from 0.58 to 0.72 V; and an average PCE of 6.9–0.1% and a highest PCE of 7.1% is obtained with an area of 0.1 cm2. The achieved PCE is the highest value in the Sb2S3 planar solar cells. In addition, the incorporated SbCl3 layer also leads to a good stability of Sb2S3 devices, by which 90% of initial performance is maintained for 1080 h storage under ambient humidity (85–5% relative humidity) at room temperature.
关键词： high efficiency,high voltage,Sb2S3 solar cells,SbCl3,passivation
更新于2025-09-12 10:27:22
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High efficiency, high color rendering index white organic light-emitting diodes based on thermally activated delayed fluorescence materials
摘要： High ef?ciency white organic light-emitting diodes (WOLEDs) with simple device architecture are desirable for next-generation light sources. However, it is still challenging in the construction of high-performance WOLEDs with a simple device structure. Based on a thermally activated delayed ?uorescence (TADF) blue emitter 2SPAc-MPM and a TADF yellow emitter TXO-TPA, high performance two-color WOLEDs with simple device architecture are demonstrated. Bene?ting from ef?cient energy transfer and wide coverage over the visible spectrum, optimized WOLED devices that have a single emitting layer (s-EML) provide a maximum color rendering index (CRI) and maximum external quantum ef?ciency (EQE) of 78.1 and 21.8%, respectively. More importantly, with multiple emitting layers (m-EMLs), a maximum EQE of 14.5% and a high CRI of 90.7 can be achieved. These results are among the best for the two-color WOLEDs with two TADF emitters.
关键词： white organic light-emitting diodes,high efficiency,thermally activated delayed fluorescence,high color rendering index
更新于2025-09-12 10:27:22
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Interfacial Engineering through Chloride-Functionalized Self-Assembled Monolayers for High-Performance Perovskite Solar Cells
摘要： The family of organic-inorganic hybrid perovskite (OIHPs) materials is one of the most promising for very high efficiency photovoltaic solar cells application. In the present work, the effect of a series of self-assembled monolayers placed at the TiO2-perovskite junction, on the functioning of triple cation perovskite solar cells has been investigated. We show that employing 4-chlorobenzoic acid leads to the marked boosting of the solar cells performances. The starting pristine cell had a 20.3% power conversion efficiency (PCE) and the chemical engineering permitted to reach a PCE up to 21.35%. Our experimental study completed by density functional theory (DFT) calculations and modelling show that this improvement is due to the reduction of interfacial states, to the improvement of the quality of the OIHP material and to the structural continuity between TiO2 and the OIHP. Especially, we demonstrate that the interfacial chemical interactions are important to consider in the design of highly efficient devices.
关键词： Perovskite solar cells,Self-assembled monolayers,Hydrides,Benzoic acid derivatives,High efficiency,Density functional theory
更新于2025-09-12 10:27:22
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Achieving Reproducibility and High Efficiency (>21%) Perovskite Solar Cells with a Pre-synthesized FAPbI3 Powder
摘要： The conventional precursor mixture based on highly pure and expensive PbI2 (purity>99.99%) is problematic in commercializing perovskite solar cells (PSC) because of a large deviation in the batch-to-batch photovoltaic performance due to underlying non-stoichiometry and/or non-perovskite phase. Here, we report on reproducible efficiency (>21%) PSCs based on the ambient-temperature-stable delta-phase FAPbI3 powder, synthesized by reacting PbI2 (either home-made or low-grade commercial product with purity <99%) with formamidinium iodide (FAI) at room temperature (~93% yield). X-ray diffraction patterns confirms that annealing the spin-coated film leads to phase purity of cubic alpha FAPbI3. As compared to the conventional precursor mixture based on PbI2 (purity = 99.9985%), a significantly reduced defect in the powder-based film is responsible for the stable and reproducible efficiency. In addition, homogeneous light-intensity-dependent surface photocurrent contributes to the reproducibility of photovoltaic performance. The quasi-steady-state PCE of 21.07% is certified from the device based on FAPbI3 powder.
关键词： perovskite solar cells,FAPbI3 powder,reproducibility,defect reduction,high efficiency
更新于2025-09-12 10:27:22
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Computer modeling of the front surface field layer on the performance of the rear-emitter silicon heterojunction solar cell with 25 % efficiency
摘要： Highly conductive materials with wide band gaps are used as front surface field (FSF) layer to achieve a prominent efficiency in silicon heterojunction (SHJ) solar cells. In this study, we demonstrate an n-type hydrogenated microcrystalline silicon oxide (μc-SiO:H) layer with high conductivity and beneficial optical properties for its application in SHJ solar cells. To develop a substitute to a-Si:H (n), we started our research in the synthesis of HIT-type solar cells with three different layers, namely, a-Si:H (n), micro-crystalline silicon (μc-Si: H(n)), and μc-SiO:H (n). Owing to its better surface passivation, wide optical gap, and high conductivity, the μc-SiO:H (n) layer was employed as a substitute to a-Si:H (n). It is difficult to thoroughly investigate the effects of every parameter, such as the thickness, the electron affinity, and the doping density on the device performance experimentally. We, therefore, used a program based on the automat for simulation of heterostructures (AFORS-HET), to evaluate the limitation of the conversion efficiency, which provides a convenient way to accurately evaluate the role of various parameters. We obtained a high efficiency with open circuit voltage, (VOC) of 755.3 mV and a fill factor (FF) of 79.82% are essential factors owing to a favorable bending of the conduction band in the μc-SiO:H (n) next to the a-Si:H (i). We achieved a high efficiency of 25.35 % using a μc-SiO:H film with both an appropriate electron affinity of 4.1 eV and the doping density of 1019 cm-3.
关键词： AFORS-HET,Silicon heterojunction solar cell,Front surface field,High efficiency
更新于2025-09-12 10:27:22
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Stretchable and colorless freestanding microwire arrays for transparent solar cells with flexibility
摘要： Transparent solar cells (TSCs) are emerging devices that combine the advantages of visible transparency and light-to-electricity conversion. Currently, existing TSCs are based predominantly on organics, dyes, and perovskites; however, the rigidity and color-tinted transparent nature of those devices strongly limit the utility of the resulting TSCs for real-world applications. Here, we demonstrate a flexible, color-neutral, and high-efficiency TSC based on a freestanding form of n-silicon microwires (SiMWs). Flat-tip SiMWs with controllable spacing are fabricated via deep-reactive ion etching and embedded in a freestanding transparent polymer matrix. The light transmittance can be tuned from ~10 to 55% by adjusting the spacing between the microwires. For TSCs, a heterojunction is formed with a p-type polymer in the top portion of the n-type flat-tip SiMWs. Ohmic contact with an indium-doped ZnO film occurs at the bottom, and the side surface has an Al2O3 passivation layer. Furthermore, slanted-tip SiMWs are developed by a novel solvent-assisted wet etching method to manipulate light absorption. Finite-difference time-domain simulation revealed that the reflected light from slanted-tip SiMWs helps light-matter interactions in adjacent microwires. The TSC based on the slanted-tip SiMWs demonstrates 8% efficiency at a visible transparency of 10% with flexibility. This efficiency is the highest among Si-based TSCs and comparable with that of state-of-the-art neutral-color TSCs based on organic–inorganic hybrid perovskite and organics. Moreover, unlike others, the stretchable and transparent platform in this study is promising for future TSCs.
关键词： Silicon microwires,High-efficiency,Flexibility,Transparent solar cells,Color-neutral
更新于2025-09-12 10:27:22
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New approach in selective laser cladding
摘要： The new approach in selective laser cladding using conical laser beams has been elaborated. Initial round laser beam is divided into 2 circular beams with regulated distribution of the laser power throughout the circular beams. Circular beams are transformed to conical beams, which are focused separately on the surface and on the deposited material for heating. The laser energy delivery to powder stream is very efficient because a total uniform absorption of laser energy in the dense powder stream (104-105 1/cm3). Under wire deposition the heating of substrate reduces the residual stresses due the reduction temperature gradients and compensates heat losses from deposition zone by thermal conduction. The required power density for melt contact formation is significantly reduced.
关键词： high efficiency,deposited material,separated heating,conical laser beams,laser cladding
更新于2025-09-12 10:27:22
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Carbon@Tellurium Nanostructures Anchored to a Si Nanowire Scaffold with an Unprecedented Liquid-Junction Solar Cell Performance
摘要： Silicon nanowire (SiNW) arrays offer a range of exciting opportunities, from maximizing solar spectrum utilization for high-performance liquid-junction solar cells (LJSCs) to functioning as potential micro-supercapacitors in the near future. This work, contrasting strongly with the previously reported studies on SiNW-based LJSCs where electron-conducting nanoparticles of Pt or Au were employed to achieve high efficiencies, aims at tethering relatively inexpensive, hole-conducting, and photoresponsive carbon-coated tellurium nanorods (C@TeNRs) to SiNWs in the quest to achieve an outstanding solar cell performance. A SiNW LJSC (control cell) with a SiNWs/Br?, Br2/carbon-fabric architecture delivers a power conversion efficiency (PCE) of 4.8%. Further, by anchoring C@TeNRs, along the lengths of SiNWs via electrophoresis, a PCE of ～11.6% is attained for a C@TeNRs@SiNWs/Br?, Br2/carbon-fabric-based LJSC. The multifunctionality of C@Te comes to the fore in this cell where (1) the p-type (hole) conducting nature of C@Te ensures efficient charge separation by rapidly collecting holes from SiNWs (and suppresses recombination), (2) the C@TeNRs are also photoresponsive and increase light-harvesting, and (3) the C coating restricts the chemical corrosion and photo-oxidation of SiNWs and the Te core by the acidic electrolyte, thereby improving the cell’s operational lifetime. This LJSC also serves as an effective stand-alone energy-storage device giving an improved areal specific capacitance of 1605 μF cm?2 (at 1 mA cm?2). This study unravels the pivotal role played by C@TeNRs in controlling the performance of SiNW-based LJSCs.
关键词： tellurium nanorods,solar cell,liquid junction,high efficiency,silicon nanowires
更新于2025-09-12 10:27:22
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Optimizing the component ratio of PEDOT:PSS by water rinse for high efficiency organic solar cells over 16.7%
摘要： For the state-of-the-art organic solar cells, PEDOT:PSS is the most popularly used hole transport material for the conventional structure. However, it still suffers from several disadvantages, such as low conductivity and harm to ITO due to the acidic PSS. Herein, a simple method is introduced to enhance the conductivity and remove the additional PSS by water rinsing the PEDOT:PSS films. The photovoltaic devices based on the water rinsed PEDOT:PSS present a dramatic improvement in efficiency from 15.98% to 16.75% in comparison to that of the untreated counterparts. Systematic characterization and analysis reveal that although part of the PEDOT:PSS is washed away, it still leaves a smoother film and the ratio of PEDOT to PSS is higher than before in the remaining films. It can greatly improve the conductivity and reduce the damage to substrates. This study demonstrates that finely modifying the charge transport materials to improve conductivity and reduce defeats has great potential for boosting the efficiency of organic solar cells.
关键词： PEDOT:PSS,Organic solar cell,water rinse,high efficiency
更新于2025-09-12 10:27:22