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Pb and Li co-doped NiOx for efficient inverted planar perovskite solar cells
摘要： Organic-inorganic halide perovskites solar cells have garnered increasing attention in recent years due to the dramatic rise in power conversion efficiencies (PCEs). In perovskite solar cells (PSCs), selecting appropriate hole transport materials to insert between perovskite layer and electrodes can improve Schottky contact, facilitate the hole transport, therefore reduce charge recombination, and therefore improve cell performance. Doping of metal cation is an effective means to regulate energy level structure and change its conductivity. In this study, we novelly introduce the Pb2+ doped NiOx as the hole transport materials to decrease the energy loss between NiOx and the perovskite layer, which improves open-circuit voltage (Voc) of the PSCs. In order to improve the conductivity of the NiOx film, the Li+ co-doping is introduced. We introduce Pb and Li co-doping strategy to match the work function of doped NiOx with perovskite valence band energy level, and increase the conductivity of NiOx for high-efficiency inverted planar PSCs. The Pb and Li co-doped NiOx devices exhibit efficient hole extraction and enhanced conductivity, which improve the performance of inverted planar PSCs to 17.02% compared with 15.40% of the undoped device.
关键词： Perovskite solar cells,Power conversion efficiency,Pb and Li co-doping,Hole transport layer,NiOx
更新于2025-09-12 10:27:22
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Doped but stable: spirobisacridine hole transporting materials for hysteresis-free and stable perovskite solar cells
摘要： Four spirobisacridine (SBA) hole-transporting materials were synthesized and employed in perovskite solar cells (PSC). The molecules bear electronically inert alkyl chains of different length and bulkiness, attached to in-plane N-atoms of nearly orthogonal spiro-connected acridines. Di-p-methoxyphenylamine (DMPA) substituents tailored to the central SBA-platform define electronic properties of the materials mimicking the structure of the benchmark 2,2’,7,7’-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9’-spirobifluorene (spiro-MeOTAD), while the alkyl pending groups affect molecular packing in thin film and affect long-term performance of PSCs. Devices with SBA-based hole transporting layers (HTL) attain efficiencies on par with spiro-MeOTAD. More importantly, solar cells with the new HTMs are hysteresis-free and demonstrate good operational stability, despite being doped as spiro-MeOTAD. The best performing MeSBA-DMPA retained 88% of the initial efficiency after 1000 h ageing test under a constant illumination. The results clearly demonstrate: SBA-based compounds are potent candidates for a design of new HTMs for PSCs with improved longevity.
关键词： perovskite solar cells,hysteresis-free,spirobisacridine,operational stability,hole-transporting materials
更新于2025-09-12 10:27:22
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Alternative electrodes for HTMs and noble-metal-free perovskite solar cells: 2D MXenes electrodes
摘要： The high cost of hole transporting materials (HTMs) and noble metal electrodes limits the application of perovskite solar cells (PSCs). Carbon materials have been commonly utilized for HTMs and noble-metal-free PSCs. In this paper, a more conductive 2D MXene material (Ti3C2), showing a similar energy level to carbon materials, has been used as a back electrode in HTMs and noble-metal-free PSCs for the ?rst time. Seamless interfacial contact between the perovskite layer and Ti3C2 material was obtained using a simple hot-pressing method. After the adjustment of key parameters, the PSCs based on the Ti3C2 electrode show more stability and higher power conversion e?ciencies (PCE) (13.83%, 27% higher than that (10.87%) of the PSCs based on carbon electrodes) due to the higher conductivity and seamless interfacial contact of the MXene electrode. Our work proposes a promising future application for MXene and also a good electrode candidate for HTM and the noble-metal-free PSCs.
关键词： noble-metal-free electrodes,hole transporting materials,perovskite solar cells,2D MXenes,Ti3C2
更新于2025-09-12 10:27:22
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Highly Efficient and Bright Inverted Top‐Emitting InP Quantum Dot Light‐Emitting Diodes Introducing a Hole‐Suppressing Interlayer
摘要： InP quantum dots (QDs) based light-emitting diodes (QLEDs) are considered as one of the most promising candidates as a substitute for the environmentally toxic Cd-based QLEDs for future displays. However, the device architecture of InP QLEDs is almost the same as the Cd-based QLEDs even though the properties of Cd-based and InP-based QDs are quite different in their energy levels and shapes. Thus, it is highly required to develop a proper device structure for InP-based QLEDs to improve the efficiency and stability. In this work, efficient, bright, and stable InP/ZnSeS QLEDs based on an inverted top emission QLED (ITQLED) structure by newly introducing a “hole-suppressing interlayer” are demonstrated. The green-emitting ITQLEDs with the hole-suppressing interlayer exhibit a maximum current efficiency of 15.1–21.6 cd A?1 and the maximum luminance of 17 400–38 800 cd m?2, which outperform the recently reported InP-based QLEDs. The operational lifetime is also increased when the hole-suppressing interlayer is adopted. These superb QLED performances originate not only from the enhanced light-outcoupling by the top emission structure but also from the improved electron–hole balance by introducing a hole-suppressing interlayer which can control the hole injection into QDs.
关键词： indium phosphide,top emitting structure,efficiency,quantum dot–based light emitting diodes (QLEDs),hole suppressing interlayer
更新于2025-09-12 10:27:22
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Hexagonal boron nitride quantum dots as a superior hole extractor for efficient charge separation in WO <sub/>3</sub> based photoelectrochemical water oxidation
摘要： Photoelectrochemical (PEC) water splitting is one of the best desirable technique to harvest clean chemical energy from abundant solar energy. However, the anodic half reaction, i.e. water oxidation is complicated due to the involvement of multiple electrons in this process. Herein, stable WO3 nanoblocks with monoclinic phase have been modified by incorporation of hexagonal boron nitride quantum dots (h-BNQDs) to improve the photogenerated electron-hole separation and additionally to hinder the charge recombination process. The photocurrent density (J) value for modified WO3 photoanode by incorporation of BNQDs has been found to be 1.63 mA/cm2 at the potential of 1.23VRHE which is approximately 2.4 fold higher than the bare WO3 photoanode. The enhancement in photocurrent density is mainly due to the hole extraction property of BNQDs on the surface of the WO3 nanoblocks. A two-fold increment in photogenerated charge carrier density (ND) value has been achieved due to better charge separation of electron-hole pairs in the modified system confirmed by the Mott-Schottky (MS) plot. Present work demonstrates a unique, low-cost strategy for enhancement of PEC water oxidation by modification of photoanode with hole extracting agents.
关键词： charge separation,boron nitride quantum dots,photoelectrochemical water oxidation,hole extracting agent,Tungsten trioxide
更新于2025-09-12 10:27:22
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Enhanced Performance and Stability in DNA-perovskite Heterostructure based Solar Cells
摘要： Deoxyribonucleic acid (DNA) has been recently recognized as hole transport material apart from its well-known generic role. The promising long-range hole transport capability makes DNA potential “molecular wires” in optoelectronics. Here, we demonstrate a core-shell heterostructure of perovskite wrapped by cetyltrimethylammonium chloride modified DNA (DNA-CTMA) through a self-assembly process. Such a design results in enhanced extraction and transport of holes in the bio-photovoltaic and boosts the device efficiency to 20.63 %. The hydrophobicity of the DNA-CTMA shell surrounding the perovskite grain boundary is also found to enhance the device stability, as the corresponding cell retained over 90% of initial efficiency after long-term ambient exposure. Building upon the hole transport characteristics of DNA-CTMA, a hole-free device exhibits high power conversion efficiency but 50,000% reduced cost. These results not only demonstrate breakthrough in designing cheap, efficient and stable bio-photovoltaics but also open the pathway towards the exciting possibility of controlled interaction between living and artificial semiconductors.
关键词： DNA,efficiency,hole transport material,perovskite,solar cells,stability
更新于2025-09-12 10:27:22
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Cocrystals with tunable luminescence colour self-assembled by a predictable method
摘要： Organic light-emitting materials play an essential role in the field of luminescent materials because they are easily prepared and they have controllable luminescent properties. Here it is shown that intermolecular interactions and luminescent properties of cocrystals can be predicted using the molecular surface electrostatic potential of selected (cid:3)-hole/(cid:2)-hole(cid:2) (cid:2) (cid:2)(cid:3) bonding donor haloperfluorobenzenes and acceptor acenaphthene (AC). Single-crystal X-ray diffraction data reveal that actual bonding patterns in five cocrystals assembled from haloperfluorobenzenes and AC are in accordance with predictable patterns of intermolecular interactions; that is (cid:3)-hole(cid:2) (cid:2) (cid:2)(cid:3) bond is the major interaction in AC–octafluoronaphthalene, AC–1,4-dibromotetrafluorobenzene and AC–1,3,5-tribromo-2,4,6-trifluorobenzene cocrystals, whereas (cid:2)-hole(cid:2) (cid:2) (cid:2)(cid:3) bond is the major interaction in AC–1,4-diiodotetrafluorobenzene and AC–1,3,5-trifluoro-2,4,6-triiodobenzene cocrystals. The luminescent properties of the cocrystals are affected by the bonding patterns between AC and haloperfluorobenzenes; the (cid:3)-hole(cid:2) (cid:2) (cid:2)(cid:3) bond leads to weak phosphorescence, whereas the (cid:2)-hole(cid:2) (cid:2) (cid:2)(cid:3) bond results in weak delayed fluorescence and relatively strong phosphorescence.
关键词： (cid:2)-hole,predictable,cocrystal,(cid:3)-hole bond,tunable luminescence colour,halogen bond
更新于2025-09-11 14:15:04
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Promising hole‐transporting materials for perovskite solar cells: Modulation of the electron‐deficient units in triphenylamine derivative‐based molecules
摘要： Modulation of the electron-deficient π-bridge units in 4-methoxy-N-(4-methoxyphenyl)-N-phenylbenzenamine (MeTPA)-based hole-transporting materials (HTMs) is a significant approach to improve hole mobility of HTMs for perovskite solar cells (PSCs). In this study, a class of simple MeTPA-based HTMs (H1-H4) with different π-bridged electron-deficient units were designed for the purpose of providing a theoretical model to obtain potential MeTPA-based HTMs. The results indicated that H2 to H4 exhibit better performance, such as larger Stokes shifts, smaller exciton-binding energy, better stability, good solubility, and higher hole mobility, in comparison with the parental material H1. H2 and to H4 materials with high hole mobility (5.45 × 10?4, 2.70 × 10?1, 3.99 × 10?3 cm2 V?1 second?1, respectively) may embody promising HTMs to yield good performance in PSCs. Therefore, the useful information obtained regarding control of the electron-deficient π-bridge units of MeTPA-based HTMs is an effective way to obtain excellent HTMs for PSC applications.
关键词： perovskite solar cells,condensed rings,charge transfer,hole mobility,hole-transporting materials
更新于2025-09-11 14:15:04
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Post-functionalization of polyvinylcarbazoles: An open route towards hole transporting materials for perovskite solar cells
摘要： We report on the potential of tuning poly(9-vinylcarbazole) (PVK) properties through functionalization for an application as hole transport material (HTM) for perovskite solar cells (PSCs). The synthesized PVK-based polymers were substituted with moieties of interest to improve the solubility, the charge transport properties, or to tune energy levels. Bis(4-methoxyphenyl)amine moieties were found to improve the hole mobility and to increase the HOMO level of the PVK. Therefore, PSCs employing PVK-[N(PhOCH3)2]2 as HTM exhibited a best PCE of 16.7%. Compared to spiro-OMeTAD, first studies have shown that PVK-[N(PhOCH3)2]2 could extend PSC lifetime.
关键词： Hole mobility,Hole-transporting materials,Device stability,Perovskite solar cells,Polyvinylcarbazoles
更新于2025-09-11 14:15:04
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Efficient Preparation Process for TiO <sub/>2</sub> Through-Hole Membranes with Ordered Hole Arrangements
摘要： Ordered TiO2 through-hole membranes were obtained effectively by the repeated use of a Ti substrate with ordered concaves. A combined process involving the formation of two-layer structures with different solubilities through an intermediate heat-treatment, and selective dissolution of the bottom part of the oxide allows the repeated use of the Ti substrate with an ordered array of concaves, which act as initiation sites for hole development during the subsequent anodization. For the repeated use of the Ti substrate with ordered concaves, the oxide layer must be removed selectively without the dissolution of the Ti substrate. A mixed solution of HF and CrO3 was found to be effective for selective dissolution. Ordered TiO2 through-hole membranes obtained by this process can be used in various applications requiring an ordered hole arrangement.
关键词： through-hole membranes,anodization,ordered hole arrangements,selective dissolution,TiO2
更新于2025-09-11 14:15:04