- 标题
- 摘要
- 关键词
- 实验方案
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Achieving over 21% Efficiency in Inverted Perovskite Solar Cells by Fluorinating a Dopant-Free Hole Transporting Material
摘要： Hole transporting materials (HTMs) play a critical role in ameliorating performance of perovskite solar cells (PSCs). Dedicated HTMs can not only improve the hole extraction and efficiency but also the stability. Herein, PFDT-COOH and fluorinated derivative, PFDT-2F-COOH were introduced as dopant-free HTMs for inverted PSCs. Compared to PFDT-COOH, PFDT-2F-COOH exhibits a deeper the highest occupied molecular orbital (HOMO) level, a higher work function on indium-tin oxide electrode, and an elevated built-in potential in the device. The PFDT-COOH device based on FA1-xMAxPbI3 mixed-cation perovskite exhibits a champion power conversion efficiency (PCE) of 20.64%, while PFDT-2F-COOH device exhibits a champion PCE of 21.68%, which is touching the highest value (21.7%) attained in inverted single-junction PSCs. The elevated efficiency is attributed to reduction of carrier recombination and enhancemnt of carrier extraction via fluorinated strategy. In addition, the two devices also show excellent operational and thermal stabilities. Therefore, our work offers a feasible strategy for high efficiency and stable inverted PSCs.
关键词： hole transporting materials,efficiency,dopant-free,stability,perovskite solar cells,fluorination
更新于2025-09-23 15:19:57
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Increased radiative recombination of AlGaN-based deep ultraviolet laser diodes with convex quantum wells
摘要： An AlGaN-based deep ultraviolet laser diode with convex quantum wells structure is proposed. The advantage of using a convex quantum wells structure is that the radiation recombination is significantly improved. The improvement is attributed to the increase of the effective barrier height for electrons and the reduction of the effective barrier height for holes, which results in an increased hole injection efficiency and a decreased electron leakage into the p-type region. Particularly, comparisons with the convex quantum barriers structure and the reference structure show that the convex quantum wells structure has the best performance in all respects.
关键词： AlGaN,radiation recombination,convex quantum wells,electron leakage,deep ultraviolet laser diode,hole injection efficiency
更新于2025-09-23 15:19:57
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Applying neoteric MgTiO3-coated TiO2 nanoparticulate films as scaffold layers in perovskite solar cells based on carbon counter electrode for retarding charge recombination
摘要： MgTiO3-coated TiO2 mesoporous scaffold layers were fabricated and applied in perovskite solar cells (PSCs) based on carbon counter electrode (CCE), in which TiO2 mesoporous layers were treated with different concentration of Mg2+ solution. Compared with PSCs based on pure TiO2 mesoporous layer, the open circuit voltage (Voc) and circuit photocurrent density (Jsc) of MgTiO3/TiO2-based devices significant improved. Intensive characterizations including scanning electron microscopy, electrochemical impedance spectroscopy can confirm that the presence of MgTiO3 shell layer can’t only retard charge recombination at CH3NH3PbI3/TiO2 interface, but also have a strong effect on the perovskite film growth. Based on the optimized treating concentration of 0.10 M, power conversion efficiency (PCE) of 10.39% could be achieved for the hole-conductor-free PSCs with excellent long-term stability, suggesting immense potential for large-scale industrial production in the future.
关键词： Carbon counter electrode,Perovskite solar cell,MgTiO3/TiO2,Mesoporous scaffold layer,Hole-conductor-free
更新于2025-09-23 15:19:57
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Phenothiazine-Based Hole Transport Materials for Perovskite Solar Cells
摘要： The promising photovoltaic solar cells based on the perovskite light-harvesting materials have attracted researchers with their outstanding power conversion efficiencies (over 23% certified). The perovskite work has geared up in just under a decade and is competing with well-established semiconductor technologies such as silicon (Si), copper indium gallium selenide (CIGS), and cadmium telluride (CdTe). To commercialize the perovskite solar cells, their stability is the major concern. To address the stability issue, several factors need to be taken into account, and one of them is developing stable hole transport materials (HTMs), which are the essential building blocks. In this mini-review, we will discuss the important features of the HTMs, such as design and development of phenothiazine-based HTMs. Since phenothiazine is a low cost and stable molecule compared to the spiro-OMeTAD, it can be modified further via molecular engineering.
关键词： hole transport materials,phenothiazine,power conversion efficiencies,stability,perovskite solar cells
更新于2025-09-23 15:19:57
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Simulation and optimization of CH3NH3SnI3 based inverted perovskite solar cell with NiO as Hole transport material
摘要： A planar perovskite solar cell (PSC) with p-i-n inverted structure is modeled and simulated using SCAPS software to determine the power output characteristics under illumination. The inverted structure is NiO/CH3NH3SnI3/PCBM where NiO is the hole transport layer (HTL), CH3NH3SnI3 is the perovskite absorber layer and PCBM is the electron transport layer (ETL). Simulation efforts are focused on thickness of three layers, defect density of interfaces, density of states, and metal work function effect on power conversion ef?ciency (PCE) of solar cell. For optimum parameters of all three layers, ef?ciency of 22.95% has been achieved. From the simulations, an alternate lead free inverted perovskite solar cell is introduced.
关键词： Electron transport material,Transparent conducting oxide,Inverted perovskite solar cell,Hole transport material,Device simulation,Defect density
更新于2025-09-23 15:19:57
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Role of Regeneration of Nanoclusters in Dictating the Power Conversion Efficiency of Metal-Nanocluster-Sensitized Solar Cells
摘要： Metal nanoclusters (NCs) have emerged as feasible alternatives to dyes and quantum dots in light energy conversion applications. Despite the remarkable enhancement in power conversion efficiency (PCE) in recent years and the increase in the number of NCs available as sensitizers, a comprehensive understanding of the various interfacial charge-transfer, transport, and recombination events in NCs is still lacking. This understanding is vital to the establishment of design principles for an efficient photoelectrode that uses NCs. In this work, we carefully design a comparison study of two representative NCs, Au and Ag, based on transient absorption spectroscopy and electrochemical impedance spectroscopy, methods that shed light on the true benefits and limitations of NC sensitizers. Low NC regeneration efficiency is the most critical factor that limits the performance of metal-nanocluster-sensitized solar cells (MCSSCs). The slow regeneration that results from sluggish hole transfer kinetics not only limits photocurrent generation efficiency but also has a profound effect on the stability of MCSSCs. This finding calls for urgent attention to the development of an efficient redox couple that has a great hole extraction ability and no corrosive nature. This work also reveals different interfacial behaviors of Au and Ag NCs in photoelectrodes, suggesting that utilizing the benefits of both types of NCs simultaneously by co-sensitization or using AuAg alloy NCs may be one avenue to further PCE improvement in MCSSCs.
关键词： metal nanoclusters,regeneration,light energy conversion,solar cells,hole transfer
更新于2025-09-23 15:19:57
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Inorganic molecule-induced electron transfer complex for highly efficient organic solar cells
摘要： Interfacial engineering of electrode modification has been proved to be an effective approach for improving the power conversion efficiency (PCE) of organic solar cells (OSCs). However, compared to the advance in active layer, the study of interfacial modification is seriously lagging behind and the contribution of electrode modification to the PCE enhancement is marginalized. Herein, we synthesized a series of polynuclear metal-oxo clusters (PMCs) with gradually varied chemical composition and photoelectronic properties, by which an efficient and stable hole extraction layer was developed to enhance OSC efficiencies. The PCE of the OSC modified by PMC-4 was improved from 15.7% to 16.3% as compared to the PEDOT:PSS device. Moreover, PMC-4 can be fabricated through solution processing without any post-treatment, and the corresponding device shows improved long-term stability. As revealed for the first time, the strong oxidizing property of PMC can induce the formation of inorganic-organic electron transfer complex with a barrier-free interface for efficient hole extraction. Furthermore, experimental data and theoretical calculation results reveal that the molecular polarization of mixed-addenda PMCs can enhance the capacitance at the AIL/active layer interfaces. As a result, the mixed-addenda PMCs can be processed by blade-coating to make a large-area OSC of 1 cm2, and a certified PCE of 14.3% was achieved.
关键词： power conversion efficiency,hole extraction layer,polynuclear metal-oxo clusters,organic solar cells,interfacial engineering
更新于2025-09-23 15:19:57
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Significant Enhancement in Quantum Dot Light-Emitting Device Stability via a Cascading Hole Transport Layer
摘要： This work investigates the effect of the hole transport layer (HTL) on the stability of electroluminescent quantum dot light-emitting devices (QDLEDs). The electroluminescence half-life (LT50) of QDLEDs can be improved by 25x through the utilization of a cascading HTL (CHTL) structure with consecutive steps in highest occupied molecular orbital energy level. Using this approach, a LT50 of 864,000 hours (for an initial luminance of 100 cd m-2) is obtained for red QDLEDs using a conventional core/shell QD emitter. The CHTL primarily improves QDLED stability by shifting excessive hole accumulation away from the QD/HTL interface and toward the inter-layer HTL/HTL interfaces. The wider electron-hole recombination zone in the CHTL for electrons that have leaked from the QD layer results in less HTL degradation at the QD/HTL interface. This work highlights the significant influence of the HTL on QDLED stability and represents the longest LT50 for a QDLED based on the conventional core/shell QD structure.
关键词： quantum dot,EL stability,exciton-polaron interactions,QDLED,organic hole transport layer,exciton-induced degradation
更新于2025-09-23 15:19:57
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Charge-transport layer engineering in perovskite solar cells
摘要： Photovoltaic (PV) technology that directly converts the solar energy into electrical energy, is regarding as one of the most promising utilization technologies of renewable and clean energy sources. Nowadays, developing low-cost and highly efficient PV technology is a hot research topic both for academia and industry. In this context, perovskite solar cells (PSCs) with metal halide perovskites [ABX3, A = CH3NH3+ (MA+), or CH(NH2)2+ (FA+), Cs+; B = Pb2+, Sn2+; X = Cl?, Br?, I?] as light harvesting material, is in the spotlight due to its easy fabrication process and high power conversion efficiency (PCE) [1,2]. To date, the certified PCE has been already pushed up to 25.2% (https://www.nrel.gov/pv/module-efficiency.html), making PSC an auspicious candidate for a new generation of photovoltaics. In future days, how to eliminate the non-essential charge carrier recombination in the device, further push the PCE approaching the Shockley-Queisser theoretical efficiency limit (~35%) and enhance the device stability, will be formidable challenges and the focus in the next stage of research work.
关键词： electron transport layer,hole transport layer,charge-transport layer,perovskite solar cells,power conversion efficiency
更新于2025-09-23 15:19:57
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Enhanced photovoltaic performance and stability of perovskite solar cells by interface engineering with poly(4-vinylpyridine) and Cu2ZnSnS4&CNT
摘要： Organic-inorganic perovskite solar cells (PSCs) are emerging candidates for next generation photovoltaic devices. In the last decade, PSCs have depicted a rapid development in device performance, meanwhile, the issue of utilizing low-cost, non-toxic materials with chemical stability as well as long term device stabilities are still lacking. To address these issues, an inexpensive, eco-friendly, and environmentally stable nanostructure of the quaternary chalcogenide Cu2ZnSnS4 (CZTS) as an inorganic hole transport material (HTM) has been investigated. Moreover, simultaneously two strategies has been employed to optimize the photovoltaic parameters. First, an interlayer of poly(4-vinylpyridine) (PVP) has been applied between the perovskite and the hole transport layer (HTL). Second, single-walled carbon nanotubes (CNTs) is incorporated into the CZTS HTL. While, the latter only result in higher short circuit current density (Jsc) from 18.3 to 20 mA cm?2, by using both of the strategies an increase in open circuit voltage (Voc) from 0.98 to 1.05 V as well as Jsc from 18.3 to 20.5 mA cm?2 has been observed. The power conversion efficiency (PCE) of the record device reached to 15.2%, fill factor (FF) increased up to 70% and also demonstrated low hysteresis of 2.3%. The formation of hydrophobic CNT webs among the sphere-like CZTS nanostructures and the presence of the PVP polymeric interlayer results in highly stable devices, which retained more than 98% of the initial PCE at room temperature and 40–45% humidity after 30 days. Thus, our results show that the combination of PVP interlayer and CZTS&CNT HTL offer an opportunity for the scalability of PSCs.
关键词： Cu2ZnSnS4,Inorganic hole transport materials,Stability,Carbon nanotubes,Poly(4-vinylpyridine)
更新于2025-09-23 15:19:57