ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Qiaopeng Cui,Xiang Zhang,Dingshuo Zhang,Xinyang Wang,Zichao Ma,Zaishang Long,Mo Zhou,Jiajun Luo,Haiping He,Zhizhen Ye,Xingliang Dai
Perovskite light-emitting diodes (PeLEDs) have been substantiated as promising candidates for high-efficiency electroluminescence. However, the maximum external quantum efficiency (EQE) of state-of-the-art PeLED is typically achieved at relatively low current densities and exhibits severe efficiency roll-off under intense electrical excitation, thereby restricting their development in high-power applications. Specifically, the uniformity of electrical injection has usually been neglected in optimization strategies, primarily due to inadequate comprehension of the microscale injection. In this study, a modified deposition method, marked static reaction deposition, is developed. The residence of precursor solution on the magnesium-doped zinc oxide substrate enables the perovskite crystalline growth homogeneously, thereby enabling the construction of a perovskite polycrystalline emission film with an ultra-low root mean square roughness of 0.72 nm. The resultant enhancement in electrical injection uniformity effectively suppresses localized carrier over-injection and mitigates EQE roll-off. The fabricated PeLED demonstrates a maximum luminance of 590,000 cd m −2 at a high current density of 964 mA cm −2 and maintains an EQE exceeding 10% at current densities up to 1000 mA cm −2 . These findings delineate a novel and broadly applicable optimization paradigm for realizing high-luminance, low roll-off, and efficient PeLEDs.
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SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2025
·Vol. 40
·期 9
·095015
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IF 2.1
Xinyan Han,Xinjie Wang,Zhichao Zhang,Zhen Sun,Zhixin Jin
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), an ordinary hole transport layer (HTL), has inherent shortcomings that restrict its use in Sn–Pb perovskite solar cells (PSCs). In this study, PEDOT:PSS was mixed with ethanol using a simple solution method, resulting in enhanced conductivity and an optimized work function. By varying the concentration of ethanol doping, the insulated PSS shell surrounding the PEDOT:PSS was stripped, and the conductivity of PEDOT:PSS was increased from 4.50 × 10−4 S cm−1 to 7.00 × 10−4 S cm−1. The work function was lowered by 0.23 eV to −5.30 eV, bringing it closer to the energy level of Sn–Pb perovskite. Ethanol-doped PEDOT:PSS was utilized as the HTL in Sn–Pb PSCs based on FA0.5MA0.5Sn0.5Pb0.5I3, resulting in 18.10% photoelectric conversion efficiency with negligible hysteresis, and more than 40% performance improvement compared to the undoped devices. Furthermore, the treatment of ethanol could enhance the stability of the devices. The doped device was placed in a glove box for one month, and its efficiency remained above 90% of the maximum value. Thus, ethanol doping in PEDOT:PSS should provide a promising strategy for developing HTLs in efficient Sn–Pb PSCs.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zuhong Li,Jinguo Cao,Xiaojie Yang,Duoling Cao,Yanyan Li,Li Zhao,Shimin Wang
Carrier recombination, which arises from defects present at both the buried interface and throughout the bulk phase, hinders performance improvement in perovskite solar cells (PSCs). Nonetheless, the current strategies still face some pressing issues. Herein, we demonstrate a novel synergistic strategy of carbon nitride (C3N3) as a buried modified layer and a perovskite antisolvent additive to reduce energy loss resulting from nonradiative recombination. C3N3 functions serve as an interfacial modification layer that enhances electron mobility, improves interface contacts, and matches energy levels between SnO2 and perovskite. Meanwhile, C3N3 acts as an antisolvent additive in the perovskite layer, reducing defect density and modulating the energy level, which boosts both the efficiency and moisture stability of PSCs. Consequently, the target devices achieve a remarkable power conversion efficiency of 21.43%, with unencapsulated devices retaining 90% of their initial value after operating 1000 h. These integrated strategies provide a promising method for simultaneously reducing interfacial and bulk defects, with potential application in other photoelectronic devices.
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Optica
·
2025
·Vol. 12
·期 11
·1728-1736
·
IF 8.5
Haotao Li,Jiming Wang,Shuming Chen
Transparent quantum-dot LEDs (Tr-QLEDs) have potential applications in see-through displays. In Tr-QLEDs, light is emitted bidirectionally from the top and bottom surfaces due to the high transparency of the electrodes. However, to maximally utilize the photons, the emission directionality must be tailored so that the photons are directed toward the viewers, which remains a critical challenge. Here, we reveal that the emission directionality, efficiency, and transparency of Tr-QLEDs are closely related to surface reflection. By engineering the surface reflection, tunable emission directionality, ranging from symmetrically bidirectional to highly unidirectional, is demonstrated in Tr-QLEDs. Specifically, by reducing the reflection of both the top and bottom electrodes, Tr-QLEDs with symmetric bottom and top emissions, high averaged transparency (90%), and high external quantum efficiency (EQE, 11%) for each side emission are achieved, making them ideal candidates for see-through, dual-sided displays. In addition, by introducing a bottom electrode with low refractive index and a top electrode with metallic/dielectric/dielectric structure, 90% of the generated photons can be directed to the bottom side, resulting in a highly unidirectional emission with a bottom-to-top luminance ratio of 10:1, a unidirectional EQE of 19.5%, and an averaged transparency of 40.7%, which enables Tr-QLEDs’ applications in see-through, unidirectional displays. This work offers theoretical and practical guidance for developing Tr-QLEDs with tunable emission directionality for various see-through display applications.
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ACS Applied Electronic Materials
·
2025
·
IF 4.7
Jiayi Li,Yuhuan Lin,Zehao Zhang,Kunlun Jiang,Jun Shao,Jiayu Zheng,Yunfeng Shi,Jiandong Fan,Wenzhe Li
All-inorganic cesium lead halide (CsPbX3, X = I–, Br–, Cl–) perovskite solar cells (PSCs) show great promise for photovoltaics due to their excellent thermal stability. However, their power conversion efficiency still lags behind that of hybrid perovskites, primarily due to the high defect densities caused by uncontrolled crystallization and the persistence of residual intermediate phases. To tackle this fundamental challenge, we developed a temperature-control strategy that regulates the wet-coating temperature during film deposition. This approach effectively modulates crystallization kinetics by balancing nucleation and growth rates, which significantly suppresses the formation of intermediate phases and promotes direct conversion to a phase-pure perovskite. As a result, the film morphology is greatly improved and trap states are reduced, leading to a remarkable enhancement in device performance. This study establishes the wet-coating temperature as a critical factor in controlling crystallization pathways and film quality, providing both deep mechanistic insights and a practical fabrication strategy for high-performance, operationally stable all-inorganic PSCs.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zhangsiyuan Jin,Hening Xing,Yian Hu,Qinqin Huang,Jaeyeon Lee,Geon-Hyoung An,Yuljae Cho
The rapid expansion of the Internet of Things (IoT) has intensified the demand for durable, self-powered systems that can simultaneously harvest energy and sense environmental stimuli. Triboelectric nanogenerators (TENGs) have gained significant attention for their versatility in harnessing various environmental energy sources. However, conventional TENGs suffer from interfacial wear and lack photoresponsiveness, limiting their wide applicability. We report a photoenhanced, noncontact TENG based on quasi-2D perovskite (PVK) that combines robust stability and modulated output performance under light illumination. The vertically oriented quasi-2D PVK architecture facilitates balanced carrier mobility, enabling efficient charge generation, transport, and accumulation. Operated in a noncontact configuration, the device eliminates mechanical degradation, maintaining structural and functional integrity under thermal stress at 80 °C and prolonged operation. Under illumination, light-mediated electrification boosts output by 75%, validating the synergistic interaction between optical and mechanical inputs. The device further functions as a self-powered sensor, capable of detecting both regular and irregular motions with enhanced sensitivity under light. This design strategy overcomes the durability–efficiency trade-off that has long constrained TENG development and establishes quasi-2D PVKs as a promising platform for resilient, self-powered systems. These findings open new pathways for adaptive energy harvesting and integrated sensing for the future connected society.
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RENEWABLE ENERGY
·
2025
·
IF 9.1
Cong Shen,Jiaqi Zhou,Tengling Ye,Peixia Yang,Lijie Sun,Guanying Chen
All-inorganic CsPbI 3 perovskite solar cells (PSCs) have shown significant progress in power conversion efficiency (PCE). However, defects at grain boundaries and interfaces still limit their performance and stability. Traditional optimization methods, which focus on individual parameters, are time- and energy-consuming and often fail to achieve optimal multi-parameter performance. To address this challenge, we develop machine learning assisted response surface methodology (ML-assisted RSM) to optimize defect regulation parameters. The reliability and accuracy of the RSM-driven optimization can be validated by ML. Furan-2,5-dicarboxylic acid (FDCA) was found to be an effective interfacial defect regulation material on the CsPbI 3 perovskite surface. Using FDCA as the model material to regulate defect, ML-assisted RSM identified optimal conditions (14.26 mM, 103°C, 9 min), achieving a high PCE of 18.71%, which aligned closely with the predicted value of 18.68%. FDCA treatment, which contributed to the “defect healing” effect, improved perovskite quality and reduced non-radiative recombination by interacting -COOH bidentate functional groups with uncoordinated Pb 2+ defects. This study demonstrates the value of ML-assisted RSM for fast and accurate multi-parameter optimization in PSCs, accelerating the development of high-performance and stable PSCs, and providing a robust framework for optimizing other photovoltaic devices.
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ACS Applied Electronic Materials
·
2025
·
IF 4.7
Chunyan Yang,Yanfu Wan,Xiaojuan Xu,Heng Zhang,Yonggang Liu,Junfeng Tong,Jianfeng Li,Kailang Wang
Quasi-2D perovskites have garnered significant attention for their light-emitting diode (LEDs) applications but suffer from nonuniform distribution across multiple phases. This property hampers energy transfer and creates abundant grain boundaries and surfaces. These structural flaws become hotspots for defect-assisted recombination, severely limiting the device performance. In this study, we report a strategy to synergistically passivate defects and tune the crystallization of quasi-2D perovskites via dual additives of guanidine bromide (GABr) and piperazine hydrobromide (PBr). The GA+ and R2NH groups, which are provided by GABr and PBr, respectively, can effectively passivate the uncoordinated Pb2+ defects. Furthermore, the hydrogen-bonding interactions between R2NH2+ and [PbBr6]4– modulate the crystal growth process, transforming the multi-n phase distribution into a concentrated distribution of high-n phases, thereby enhancing device performance. As a result, the resulting green BA2Csn–1PbnBr3n+1 PeLED exhibits a current efficiency of 53.05 cd/A and a peak external quantum efficiency of 15.68% at an emission wavelength of 512 nm, which is significantly higher than that of the control device. This study offers an innovative approach for strategically manipulating the phase distribution within quasi-2D perovskite films and significantly diminishing defect density, thereby paving the way for the development of high-efficiency PeLEDs.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jianfeng Du,Yongpeng Huang,Yikai Yun,Wenjie Wei,Sijie Jiang,Yinxiao Yang,Mengyu Chen,Cheng Li
The deposition of charge blocking layer (CBL) has been proved as an essential approach to improve the unbalanced charge injection and enhance the external quantum efficiency (EQE) of perovskite light-emitting diodes (PeLEDs). Nonetheless, in near-infrared (NIR) PeLEDs, the CBL covering on the typical ZnO electron transport layer (ETL) usually affects the deprotonation process and thereby decreases the crystallinity of perovskite film. In this work, we improve the performance of PeLEDs by atomic layer deposition (ALD) of an ultra-thin (0.43 nm) aluminum oxide (Al 2 O 3 ) CBL between the ETL ZnO and perovskite layer. This CBL improves the charge injection balance and optimizes the morphological and crystalline characteristics of perovskite film. The NIR PeLEDs achieve a peak EQE of 17.0 % with the optimal Al 2 O 3 CBL, representing a 25 % enhancement compared to the control device. In particular, with in-situ electroabsorption (EA) spectroscopy, we discover that the presence of interface permanent dipoles ascribed to the ultra-thin Al 2 O 3 CBL, facilitates the charge injection balance by greatly increasing the built-in potential and reducing the electron injection. Hence, this work paves a practical way to enhance the efficiency of NIR PeLEDs without influencing the deprotonation process.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2025
·
IF 4.9
Junyi Sima,Yi Xu,Xiaoqing Cao,Xianggui Kong,Wenying Shi
The crystallization degree of perovskite (PVK) crystals is vital for solar cell efficiency, as it affects charge carrier transport. Researchers are using organic molecules to improve PVK crystallization, but face challenges with charge transport efficiency at interfaces due to the principle of maximum entropy. Here, living supramolecular assemblies (LSA) were prepared in the two-dimensional confined space of layered double hydroxide (LDH). The carbonyl (C O) functional groups in LSA assembled from terephthalic acid (TPA) coordinated with the uncoordinated Pb 2+ ions in the PVK light-absorbing layer, passivating grain boundary defects. Importantly, the ordered charge transport in LSA can decrease the carrier complexation, which are commonly the main causes of charge carrier recombination and the decline in device performance. Thus, following the addition of TPA-LSA, carbon-based perovskite solar cells (PSCs) processed entirely in air achieved a maximum photoelectric conversion efficiency (PCE) of 13.86 %. This work provides an effective strategy for the enhancing the efficiency PSCs by using the supramolecular materials.
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Nature Communications
·
2019
·Vol. 10
·期 1
·1-10
·
IF 11.878
Chen Yihua,Li Nengxu,Wang Ligang,Li Liang,Xu Ziqi,Jiao Haoyang,Liu Pengfei,Zhu Cheng,Zai Huachao,Sun Mingzi,Zou Wei,Zhang Shuai,Xing Guichuan,Liu Xinfeng,Wang Jianpu,Li Dongdong,Huang Bolong,Chen Qi,Zhou Huanping
Further minimizing the defect state density in the semiconducting absorber is vital to boost the power conversion efficiency of solar cells approaching Shockley-Queisser limit. However, it lacks a general strategy to control the precursor chemistry for defects density reduction in the family of iodine based perovskite. Here the alkaline environment in precursor solution is carefully investigated as an effective parameter to suppress the incident iodine and affects the crystallization kinetics during film fabrication, via rationale adjustment of the alkalinity of additives. Especially, a ‘residual free’ weak alkaline is proposed not only to shrink the bandgap of the absorber by modulating the stoichiometry of organic cation, but also to improve the open circuit voltage in the resultant device. Consequently, the certified efficiency of 20.87% (Newport) is achieved with one of the smallest voltage deficits of 413 mV in the planar heterojunction perovskite solar cell.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Shuang Wei,Yingwei Li,Longlong Wang,Kexin Li,Bin He,Ruirui Zhang,Ruixia Liu
Nanostructured ceria has attracted much attention in the field of redox catalysts due to the numerous active sites with excellent redox ability. Based on the acidic medium etching strategy, we constructed the strong binding centers (hydroxyl sites and strong acid sites) on the surfaces of nanostructured ceria, which regulate the adsorption process of KA-Oil (the mixture of cyclohexanol and cyclohexanone) and to promote high KA-Oil selectivity in cyclohexane oxidation. The three CeO 2 (nanocube, nanorod and nanopolyhedron) with different exposed crystal planes were treated by acid etching to change the surface sites and catalytic properties. The transition behavior of surface sites during etching was revealed, abundant strong binding centers were proved to be constructed successfully. And especially for the nanorod treated by acid (Acid@CeO 2 -NR) with the strongest response for sulfuric acid etching, the strong adsorption of cyclohexanone by strong binding centers was confirmed based on the in-situ DRIFTs. The sulfuric acid etching strategy to enhance the selective oxidation of cyclohexane based on the construction of strong binding centers was proved to be feasible and effective, Acid@CeO 2 -NR with strongest etching response achieved the dramatic promotion of KA-Oil selectivity from 64.1% to 92.3%.
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