Journal of Materials Chemistry C最新文献

{"title":"Thermal conduction-induced crystallization and achieving high efficiency in HTM-free carbon-based CsPbI2Br solar cells by regulating the dipole moment of aliphatic amine acetate additives†","authors":"Xinlong Zhang, Jincheng Huang, Hengzhi Zuo, Yuanfang Zhang, Yuhang Guo, Yifei Shi, Jianlin Chen, Guijun Li, Wei Li and Zhuoyin Peng","doi":"10.1039/D4TC04760E","DOIUrl":"https://doi.org/10.1039/D4TC04760E","url":null,"abstract":"<p >Despite the advancements in film fabrication techniques for emerging perovskite solar cells, achieving a high-quality film by solution processing, while maintaining considerable performance remains a significant challenge. To tackle the issue of inferior CsPbI<small>₂</small>Br perovskite films deposited <em>via</em> solution-based methods, a novel thermal conduction heating approach was devised and implemented, significantly enhancing film uniformity. Crucially, aliphatic amine acetates (3A) were introduced into the precursor solution to regulate the crystallization process and therefore to mitigate defects. Systematic investigation into the impact of 3A molecules featuring varying alkyl chain lengths on defect passivation revealed that the molecular dipole moment of these additives contributed to both defect mitigation and grain size refinement. Notably, the integration of alkyl chains significantly bolstered the hydrophobic properties of the perovskite film. Consequently, an impressive efficiency of 13.50% for HTM-free carbon-based CsPbI<small>₂</small>Br perovskite solar cells was achieved, and the device exhibited robust stability retaining 92.4% of its initial efficiency at room temperature after being stored in dry air for 5400 h. This research offers profound insights into defect passivation mechanisms and perovskite crystallization dynamics, paving the way for further advancements in the field of perovskite solar cell technology.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 14","pages":" 7071-7081"},"PeriodicalIF":5.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hollowing integration engineering to construct MOF-derived carbon composites for lightweight and efficient microwave absorption materials†","authors":"Zhe Zhang, Jiewu Cui, Dongbo Yu, Pengjie Zhang, Wei Sun, Yong Zhang, Song Ma, Xiaohui Liang and Yucheng Wu","doi":"10.1039/D5TC00412H","DOIUrl":"https://doi.org/10.1039/D5TC00412H","url":null,"abstract":"<p >The rational and precise preparation of metal–organic framework (MOF)-derived carbon-based absorbers with a fine hollow structure and the tuning of their electromagnetic properties at low loading for synergistic optimization of impedance matching and high attenuation capacity for efficient utilization have become important challenges for lightweight electromagnetic wave absorption (EMWA). Herein, a hollow particle-assembled one-dimensional (1D) nanotube carbon matrix composite loaded with dispersed Co nanoparticles is fabricated by a two-step hollowing strategy of solvent-assisted ligand exchange (SALE) and a protected etching process, combined with a subsequently optimized pyrolysis. This novel hollow structure promotes multiple reflections and scattering of incident electromagnetic waves, optimizes impedance matching, and also greatly enhances the synergistic effect of multiple loss mechanisms, remarkably improving the electromagnetic characteristics. The results indicate that Co-ZIF-HPT-700 achieves a minimum reflection loss (RL<small>_min</small>) of −76.93 dB at 8.96 GHz with a fill rate of only 10 wt%. At the matched thicknesses of 2.12 and 2.96 mm, it realizes full-band absorption in Ku and X bands, respectively. This work provides novel ideas for the design of a new generation of ultra-lightweight EMWA materials.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 13","pages":" 6556-6568"},"PeriodicalIF":5.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Self-assembly of size-controlled perovskite crystallite arrays on modulated substrates for laser applications†","authors":"Bin Liu, Junhan Guo, Hanying Zhang, Yang Tang, Liang Qin, Zhidong Lou, Yufeng Hu, Feng Teng and Yanbing Hou","doi":"10.1039/D5TC00048C","DOIUrl":"https://doi.org/10.1039/D5TC00048C","url":null,"abstract":"<p >In recent years, organo–inorganic hybrid lead halide perovskite semiconductors have made significant progress in fields such as solar cells, light-emitting diodes, detectors, and lasers owing to their excellent photoelectric properties. Perovskite crystallites can be used to achieve micro-nanoscale lasers, which would provide a light source for integrated photonics. Previous studies have reported that it is difficult to prepare perovskite crystals using one-step solution processing to achieve orderly distribution on the substrate and optical resonators with high-quality factors because of random nucleation and excessive nucleation points. Orderly distribution is mostly achieved through more complicated inkjet printing. In this work, a poly(4-butylphenyl-diphenyl-amine) (poly-TPD) layer was spun on a substrate to reduce the wettability of a perovskite precursor solution, which leads to a decrease in the number of nucleation points during the growth of perovskite crystals, obtaining a perovskite crystallite array with good laser properties. The distribution and laser threshold of perovskite crystallites on different material substrates around poly-TPD material systems are discussed. By utilizing special large-sized crystallites, continuous variation in the grain size of perovskite crystallites is achieved, thereby enabling the investigation on the impact of grain size on the laser threshold.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 12","pages":" 6233-6239"},"PeriodicalIF":5.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A cost-effective and high-sensitivity pressure sensor for wearable electronics using an MXene/Ag NFs-coated cotton fabric†","authors":"Yuan Fang, Lijun Zeng, Doudou Li, Yunfeng Su, Nairu He and Hengzhong Fan","doi":"10.1039/D4TC04847D","DOIUrl":"https://doi.org/10.1039/D4TC04847D","url":null,"abstract":"<p >Wearable pressure sensors show significant potential in areas such as health monitoring, electronic skin and human–computer interaction. However, achieving a balance between a wide sensing range and high sensitivity while simultaneously reducing manufacturing costs and simplifying fabrication processes remains a significant challenge for wearable pressure sensors. In this study, pressure sensors based on an MXene/Ag NFs coated cotton fabric (MACF) were prepared by a simple dip-coating technique. The hydroxyl groups in the cotton fabric interact with the hydrophilic groups on the MXene nanosheets, promoting strong adhesion between the two materials and forming a practical conductive pathway. The MACF sensor adopts a sandwich structure, demonstrating excellent performance, including a wide sensing range (0–60 kPa), high sensitivity (1.45 kPa<small>⁻¹</small>, 0–10 kPa), and stable responses over 410 cycles. The working mechanism of the MACF sensor is discussed in detail. Notably, the sensor maintains stable sensing performance under extreme humidity (40–80 RH%) and temperature conditions (20–100 °C). Furthermore, the sensor successfully detects and differentiates various human physiological signals, such as finger movements and wrist pulses. This study presents a simple fabrication method that achieves a balance between sensitivity and sensing range in cotton fabric-based sensors, demonstrating promising potential for applications in flexible wearable devices, electronic skins, and bionic robots.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 12","pages":" 6277-6288"},"PeriodicalIF":5.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polariton emission properties of an organic dye-doped polymer microcavity†","authors":"Lulu Xue, Ziyang Chen, Yatong Zhang, Xiaoya Yan, Liang Zhao, Pengxue Jia, Bo Gao and Hongyan Shi","doi":"10.1039/D4TC04791E","DOIUrl":"https://doi.org/10.1039/D4TC04791E","url":null,"abstract":"<p >Although organic polariton lasing has been recently demonstrated in dye-doped polymer microcavities, they only utilize the excitons and photons forming new emissive polaritonic states, often ignoring the strong and stable excimer emission that arises from dye aggregation at specific concentrations. The <em>N</em>,<em>N</em>′-bis(2-phenylethyl)-3,4,9,10-perylene dicarboximide (EP-PDI) dye-doped polymer showed stable and strong excimer emission at a specific concentration, with high PLQYs. In this study, we fabricated EP-PDI dye-doped polymer cavities with controlled cavity lengths (800 and 850 nm) and investigated the polariton emission properties. Within the cavities, we observe two types of cavity polariton emissions: the first is dominated by strong exciton–photon coupling with a Rabi splitting of 0.16 eV. Another polariton emission originates from the excimer radiative pumps. The radiatively pumping excimer populates the lower polariton state, with the decay profile reflecting the density of states. The excimer relaxation in the microcavity was faster than that of the pure film. The cavity polariton emission derived from the excimer state is sensitive to the cavity environment. The cavity length significantly affects the microcavity polariton emission wavelength and lifetime. Our findings highlight the importance of the microcavity length control in designing organic polaritonic devices, where excimer radiative pumps and polariton relaxation pathways critically influence performance.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 13","pages":" 6772-6778"},"PeriodicalIF":5.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Progress in organic material based solid-state X-ray scintillators","authors":"Mengmeng Zhao, Peng Wan, Junqing Shi and Lei Ji","doi":"10.1039/D4TC04139A","DOIUrl":"https://doi.org/10.1039/D4TC04139A","url":null,"abstract":"<p >Organic solid-state scintillating materials have attracted wide attention due to their irreplaceable advantages such as low cost, easy production, flexibility, and adjustable luminescence performance. Recently, various organic material based solid-state X-ray scintillators have emerged. This has greatly facilitated the practical application of X-ray scintillators in radiation detection, medical imaging, and security identification. This paper reviews the latest progress in solid-state organic scintillating materials in crystals and thin film forms, and in composite scintillators bearing organic components. With an emphasis on their molecular structure and properties, this work aims to provide the latest progress in organic scintillating solids, including their development and applications, as well as the associated challenges and problems.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 11","pages":" 5424-5438"},"PeriodicalIF":5.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reducing MoS2 FET contact resistance by stepped annealing to optimize device performance†","authors":"Peng Liu, Xin Lin, Zewen Li, Dianyou Song, Fang Wang, Yan Cheng, Sannian Song and Kailiang Zhang","doi":"10.1039/D4TC04669B","DOIUrl":"https://doi.org/10.1039/D4TC04669B","url":null,"abstract":"<p >Transition metal dichalcogenides (TMDCs), especially MoS<small>₂</small>, are essential materials that are seen as the future of the electronics industry going forward. It's acknowledged that annealing is usually required when the fabrication of MoS<small>₂</small>-based devices inevitably introduces contaminants, resulting in poor contact. However, conventional annealing hardly improves the interfacial contact between metal electrodes and MoS<small>₂</small>. In this work, MoS<small>₂</small> back-gate field effect transistors are prepared on the basis of prepared high-quality single-crystal MoS<small>₂</small> by CVD. Innovative stepped annealing was applied to device optimization to improve interfacial contact and electrical performance. The optimum device annealing temperature in an Ar atmosphere is 300 °C, at which the interface contact resistance is reduced from 209.3 kΩ μm to 4.7 kΩ μm compared to the pristine state. Decrease in the Schottky barrier height plays a key role in improving interfacial contact and electrical properties. After stepped annealing treatment, the device on/off ratio is improved by two orders of magnitude, the subthreshold swing is reduced by approximately 80%, and the field effect mobility is improved by approximately 10 times. This work is crucial for device annealing and high performance MoS<small>₂</small>-based transistor devices.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 13","pages":" 6720-6727"},"PeriodicalIF":5.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chemically driven magnetic responsivity to multiple physical stimuli in a spin-crossover layered iron(ii)–rhenium(v) framework†","authors":"Tomasz Charytanowicz, Michał Heczko, Katarzyna Dziedzic-Kocurek, Dawid Pinkowicz, Shin-ichi Ohkoshi, Szymon Chorazy and Barbara Sieklucka","doi":"10.1039/D4TC05094K","DOIUrl":"https://doi.org/10.1039/D4TC05094K","url":null,"abstract":"<p >Achieving the responsivity of a magnetic molecular material to physical and chemical stimuli paves the way for a new generation of switchable materials for memory devices and sensing applications. Here we present a two-dimensional spin-crossover {[Fe<small>^II</small>(4-phpy)<small>₄</small>]<small>₃</small>[Re<small>^V</small>(CN)<small>₈</small>]<small>₂</small>}·H<small>₂</small>O·MeOH (<strong>1<small>^sol</small></strong>, 4-phpy = 4-phenylpyridine) coordination polymer, which enables the switching of magnetic properties using three physical stimuli, <em>i.e.</em>, temperature, light, and pressure. Its responsivity is chemically modulated, as upon drying in the air, it undergoes a reversible single-crystal-to-single-crystal (SCSC) transformation to the air-stable phase of {[Fe<small>^II</small>(4-phpy)<small>₄</small>]<small>₃</small>[Re<small>^V</small>(CN)<small>₈</small>]<small>₂</small>}·2H<small>₂</small>O (<strong>1<small>^air</small></strong>) of different magnetic responsivity than the original phase. The <strong>1<small>^sol</small></strong> phase exhibits a weakly cooperative, gradual thermal Fe(<small>II</small>) SCO effect in the 80–160 K range, while the <strong>1<small>^air</small></strong> phase shows a two-step thermal SCO phenomenon with the distinct thermal hysteresis loop for the higher-temperature step in the 150–210 K region. Moreover, the thermal SCO effect of <strong>1<small>^air</small></strong> can be modulated by relative humidity. The thermal hysteresis loop of <strong>1<small>^air</small></strong> is modified by external pressure, resulting in a magnetic memory effect at room temperature. The <strong>1<small>^sol</small></strong> and <strong>1<small>^air</small></strong> phases also exhibit a pronounced thermally reversible photomagnetic effect under 520 and 638 nm irradiation, distinctly stronger for <strong>1<small>^sol</small></strong>, indicating a more effective light-induced excited spin-state trapping (LIESST) for the MeOH-containing system. Interestingly, for <strong>1<small>^air</small></strong>, the 808 nm irradiation leads to a thermally reversible decrease of the magnetization (reverse-LIESST) while the standard yet weakened LIESST is observed under such conditions for <strong>1<small>^sol</small></strong>. This work demonstrates the ability of the layered iron(<small>II</small>)–octacyanidorhenate(<small>V</small>) framework to effectively integrate chemical and physical stimuli for multi-switching of the magnetic signal through the spin crossover effect of modifiable characteristics.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 13","pages":" 6745-6761"},"PeriodicalIF":5.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photothermal response and precise control of circularly polarized luminescence via double-layered films based on cholesteric liquid crystals†","authors":"Sha Huang, Qimei Wu, Yongjie Hu, Xincan Wang, Yongjie Yuan and Hailiang Zhang","doi":"10.1039/D5TC00064E","DOIUrl":"https://doi.org/10.1039/D5TC00064E","url":null,"abstract":"<p >The regulation of the performance of circularly polarized luminescence (CPL) materials has long been a subject of considerable interest. However, achieving simultaneous photothermal responsiveness and precise control of CPL performance remains a challenge. To address this issue, a double-layered film strategy is employed, where the overlap between the emission band of a luminescent layer, exhibiting non-polarized or circularly polarized luminescence, and the selective absorption and reflection bands of a cholesteric liquid crystal (N*-LC) layer with stimuli-responsive properties is utilized to achieve photothermal response and precise regulation of CPL performance. The non-chiral luminescent compound and the CPL copolymer are used as the first layer, combined with N*-LC polymers Azo(<em>x</em>)–Mt(<em>y</em>) synthesized in this work, to prepare the double-layered films NI/Azo(<em>x</em>)–Mt(<em>y</em>) and Py/Azo(<em>x</em>)–Mt(<em>y</em>). Non-polarized or circularly polarized fluorescence is emitted from the first-layered film upon light excitation, allowing static regulation of CPL performance after passing through selective absorption and selective reflection of the second-layered N*-LC film. Additionally, the CPL signals of double-layered films are further precisely regulated in terms of on–off, inversion, intensity, and wavelength by adjusting the Azo(<em>x</em>)–Mt(<em>y</em>) copolymer composition. Furthermore, under different photothermal conditions, the CPL wavelength and intensity of double-layered films are dynamically regulated by stimulating Azo(<em>x</em>)–Mt(<em>y</em>), as azobenzene mesogens undergo <em>trans</em>–<em>cis</em> isomerization.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 13","pages":" 6641-6649"},"PeriodicalIF":5.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Orthogonal small-molecule zinc porphyrin derivative as efficient hole transport material for high-performance inverted perovskite solar cells†","authors":"Chaojun Sun, Lunan Du, Wenxiu Du, Jingsheng Wang, Huiru Li, Youtian Tao and Zhengyi Sun","doi":"10.1039/D4TC04982A","DOIUrl":"https://doi.org/10.1039/D4TC04982A","url":null,"abstract":"<p >Hole transport materials (HTMs) are crucial components for achieving efficient and stable perovskite solar cells (PSCs). Inverted p–i–n structured devices offer advantages such as low-temperature film formation and flexible manufacturing. In this study, we designed and synthesized a star-shaped small-molecule zinc porphyrin derivative with an orthogonal spatial configuration, ZnP-4ThDPP, as the HTM layer, and further optimized the PSCs using LiTFSI as a dopant. The unique spatial configuration and excellent low-temperature film formation properties of ZnP-4ThDPP improve the efficiency of hole extraction while reducing manufacturing costs. The PSCs also exhibit good reproducibility and long-term stability. The LiTFSI dopant, which induces p-type doping, enhances the conductivity of the hole transport layer, improves the crystallization quality of the upper perovskite film, and reduces the defect state density. These combined effects collectively boost the device efficiency to 20.25%, representing the highest reported value for inverted PSCs using small-molecule zinc porphyrin-based HTMs.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 12","pages":" 6436-6443"},"PeriodicalIF":5.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}