Publications by authors named "Yuang Fu"

Background: The indicators of abdominal obesity have shown to be associated with a high risk of cardiovascular diseases (CVDs), even adjusted for body mass index (BMI). We aimed to investigate the association between neck circumference, waist-to-height ratio (WHtR), Chinese visceral adiposity index (CVAI) and incident heart failure (HF) in Chinese adults.

Methods: The current study included 86,546 participants from two independent cohorts: the Kailuan I study established in 2006 and the Kailuan study II established in 2008.

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Two highly crystalline 2D acceptors, ATIC-C11 and ATIC-BO, with acenaphthene-expanded quinoxaline central cores, have been demonstrated with very different characteristics in ternary organic solar cells (OSCs). The difference in side chains induces their distinctive molecular packing mode and unique crystal structure, in which ATIC-C11 displays a 3D structure with an elliptical framework, and ATIC-BO gives a rectangular framework. Their high crystallinity contributes to organized molecular packing in ternary devices, thus low energetic disorder and suppressed energy loss.

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  • Poor quality and oxidation vulnerability have limited the use of tin-based perovskite quantum dots (TQDs), but this study presents a new method to create higher quality CsSnI-based TQDs using a mix of CsCO and CsI.
  • The incorporation of CsI improved the I:Sn ratio, resulting in smaller, more uniform TQDs with better crystallinity and photoluminescence, as confirmed by XPS and NMR analyses.
  • These newly developed CsI-TQDs exhibit remarkable stability, lasting over an hour in air and more than 24 hours before complete oxidation, and they also maintain their qualities after changes to their ligands, suggesting enhanced potential for electronic device applications.
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  • Inverted perovskite/organic tandem solar cells (P/O TSCs) have poor long-term stability due to halide segregation in hybrid perovskites, which limits their practical use.
  • Developing all-inorganic wide-band gap (WBG) perovskites is a potential solution as they offer better stability, but they face challenges like quick crystallization and large energy loss.
  • Two additives, based on 9,10-anthraquinone-2-sulfonic acid (AQS), have been designed to improve crystallization and reduce halide segregation, resulting in a high-performance all-inorganic solar cell with enhanced stability and a lifetime of 1000 hours.
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The migration of mobile ionic halide vacancies is usually considered detrimental to the performance and stability of perovskite optoelectronic devices. Taking advantage of this intrinsic feature, we fabricated a CsPbI perovskite quantum dot (PQD)-based write-once-read-many-times (WORM) memory device with a simple sandwich structure that demonstrates intrinsic ternary states with a high ON/OFF ratio of 10:10:1 and a long retention time of 10 s. Through electrochemical impedance spectroscopy, we proved that the resistive switching is achieved by the migration of mobile iodine vacancies (Vs) under an electric field to form conductive filaments (CFs).

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As the rise of nonfullerene acceptors (NFA) has allowed lab-scale organic solar cells (OSC) to reach 20% efficiency, translating these devices into roll-to-roll compatible fabrication still poses many challenges for researchers. Among these are the use of green solvent solubility for large-scale manufacture, roll-to-roll compatible fabrication, and, not least, information on charge carrier dynamics in each upscaling step, to further understand the gap in performance. In this work, the reproducibility of champion devices using slot-die coating with 14% power conversion efficiency (PCE) is demonstrated, under the condition that the optimal thickness is maintained.

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Inverted organic solar cells (OSCs) have garnered significant interest due to their remarkable stability. In this study, the efficiency and stability of inverted OSCs are enhanced via the in situ self-organization (SO) of an interfacial modification material Phen-NaDPO onto tin oxide (SnO). During the device fabrication, Phen-NaDPO is spin-coated with the active materials all together on SnO.

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  • Researchers developed a new type of organic phototransistor by altering the chemical composition of a co-polymer to achieve better charge transport and crystallinity.
  • The switch from sulfur to oxygen in the polymer's structure increases electron affinity and allows for better ambipolar (both positive and negative charge transport) performance.
  • The resulting device shows impressive sensitivity and can function effectively as a near-infrared detector with high responsiveness and gain enhancements when exposed to light.*
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  • * Researchers have introduced specially engineered dimer acceptors that act as stabilizers in the active layer, which help optimize crystallization and thermal transitions within the solar cells.
  • * By reducing the density of trap states in the devices and maintaining an optimized morphology, these advancements lead to improved PCE and minimize efficiency loss, providing a pathway towards creating more stable and long-lasting OSCs.
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An organic photovoltaic bulk heterojunction comprises of a mixture of donor and acceptor materials, forming a semi-crystalline thin film with both crystalline and amorphous domains. Domain sizes critically impact the device performance; however, conventional X-ray scattering techniques cannot detect the contrast between donor and acceptor materials within the amorphous intermixing regions. In this study, we employ neutron scattering and targeted deuteration of acceptor materials to enhance the scattering contrast by nearly one order of magnitude.

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  • Dopant-free hole transport materials (HTMs) are essential for efficient and stable perovskite solar cells (PSCs), yet most current design methods focus on a single strategy.
  • This study introduces four innovative HTMs based on a dithienothiophenepyrrole (DTTP) core, employing a dual-strategy approach that combines both conjugate and side chain engineering.
  • The resulting material, DTTP-ThSO, achieves a power conversion efficiency of 23.3% and showcases the best fill factor for small molecular HTMs in PSCs, demonstrating a successful method for optimizing performance and stability.
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The simultaneous improvement of efficiency and stability of organic solar cells (OSCs) for commercialization remains a challenging task. Herein, we designed asymmetric acceptors DT-C8Cl and DT-C8BTz with functional haloalkyl chains, in which the halogen atoms could induce noncovalent interactions with heteroatoms like O, S, and Se, etc., thus leading to appropriately manipulated film morphology.

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Side chain engineering plays a vital role in exploring high-performance small molecule acceptors (SMAs) for organic solar cells (OSCs). In this work, we designed and synthesized a series of A-DA'D-A type SMAs by introducing different N-substituted alkyl and ester alkyl side chains on benzotriazole (BZ) central unit and aimed to investigate the effect of different ester substitution positions on photovoltaic performances. All the new SMAs with ester groups exhibit lower the lowest unoccupied molecular orbital (LUMO) energy levels and more blue-shifted absorption, but relatively higher absorption coefficients than alkyl chain counterpart.

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Due to their versatile applications, perovskite quantum dot (PQD)-based optoelectrical devices have garnered significant research attention. However, the fundamental packing behavior of PQDs in thin films and its impact on the device performance remain relatively unexplored. Drawing inspiration from theoretical models concerning packing density with size mixtures, this study presents an effective strategy, namely, binary-disperse mixing, aimed at enhancing the packing density of PQD films.

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The non-fullerene acceptors (NFAs) employed in state-of-art organic photovoltaics (OPVs) often exhibit strong quadrupole moments which can strongly impact on material energetics. Herein, we show that changing the orientation of Y6, a prototypical NFA, from face-on to more edge-on by using different processing solvents causes a significant energetic shift of up to 210 meV. The impact of this energetic shift on OPV performance is investigated in both bilayer and bulk-heterojunction (BHJ) devices with PM6 polymer donor.

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Using a combinatory blending strategy is demonstrated as a promising path for designing efficient organic solar cells (OSCs) by boosting the short-circuit current density and fill factor. Herein, a high-performance ternary all-small molecule OSC (all-SMOSCs) using a narrow-bandgap alloy acceptor containing symmetric and asymmetric molecules (BTP-eC9 and SSe-NIC) and a wide-bandgap small molecule donor MPhS-C2 is reported. Introducing the synthesized SSe-NIC into the MPhS-C2:BTP-eC9 host system can broaden the absorption spectrum, modulate energy offsets, and optimize the molecular packing of the host materials.

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