- 标题
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- 关键词
- 实验方案
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Mechanically Stacked, Two-Terminal Graphene-Based Perovskite/Silicon Tandem Solar Cell with Efficiency over 26%
摘要： A novel configuration for high-performant perovskite/silicon tandem solar cells is demonstrated using a facile mechanical stacking of the sub-cells. The resulting champion perovskite/silicon tandem solar cell exhibits a stabilized efficiency of 25.9% over an active area of 1.43 cm2.
关键词： graphene doping,stabilized efficiency,perovskite/silicon tandem solar cells,mechanical stacking
更新于2025-09-23 15:19:57
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Control of ??a???? stacking in carbazole-benzimidazo???1,2- <i>f</i> ???phenanthridines: the design of electron-transporting bipolar hosts for phosphorescent organic light-emitting diodes
摘要： Two bipolar hosts, 8-cbzBIFP and 10-cbzBIFP, both with basic skeletons of orthogonally-connected carbazole and benzimidazoh1,2-fiphenanthridine (BIFP) have been prepared. The planar structure of the BIFP moiety in comparison to the governs the molecular stacking in the crystal lattice. Electron transport properties, benzimidazole derivatives, are facilitated. Both hosts display fabulous performances in phosphorescent organic light-emitting diodes with bis(2-phenylpyridine)(acetylacetonate)iridium(III) as an emitter. The optimized green PhOLED of 10-cbzBIFP achieves the maximum brightness (Lmax) of 58 810 cd m(cid:2)2, the maximum current e?ciency (Zc) of 87.0 cd A(cid:2)1 and external quantum e?ciency (EQE) of 21.1%. Likewise, 8-cbzBIFP shows an Lmax of 58 870 cd m(cid:2)2, Zc of 77.3 cd A(cid:2)1 and EQE of 19.1%.
关键词： electron-transporting,phosphorescent organic light-emitting diodes,carbazole-benzimidazoh1,2-fiphenanthridines,bipolar hosts,p–p stacking
更新于2025-09-23 15:19:57
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Introducing Trifluoromethyl to Strengthen Hydrogen Bond for High Efficiency Organic Solar Cells
摘要： Nowadays, the ternary strategy has become a common way to improve the power conversion efficiency (PCE) of organic solar cells (OSCs). The intermolecular interaction between the third component and donor or acceptor plays a key role in achieving a high performance. However, hydrogen bond as a strong intermolecular interaction is rarely considered in ternary OSCs. In this work, we introduce trifluoromethyl on a newly synthesized small molecular DTBO to strength hydrogen bonds between DTBO and IEICO-4F. Due to the existence of hydrogen bonds has a strong impact on electrostatic potential (ESP) and benefits π-π stacking in the active layer, the ternary OSCs show superior charge extraction and low charge recombination. In DTBO, PTB7-Th and IEICO-4F based ternary devices, the PCE increases from 11.02 to 12.48%, and short-circuit current density (JSC) increases from 24.94 to 26.43 mA/cm2 compared with typical binary devices. Moreover, the addition of DTBO can realize an energy transfer from DTBO to PTB7-Th and broaden the absorption spectrum of blend films. Grazing-incidence wide-angle X-ray scattering (GIWAXS) patterns show that the π-π stacking distance of IEICO-4F decreased after adding 10 wt% DTBO. The effect of the hydrogen bond is also achieved in the PM6: Y6 system, showing 16.64% efficiency by comparison to the 15.49% efficiency of binary system. This work demonstrates that introduce trifluoromethyl to enhance hydrogen bond which improve π-π stacking can achieve higher performance in OSCs.
关键词： energy transfer,ternary devices,organic solar cells,hydrogen bond,π-π stacking
更新于2025-09-23 15:19:57
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[IEEE 2018 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS) - San Diego, CA, USA (2018.10.15-2018.10.17)] 2018 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS) - A 1–20 GHz Distributed, Stacked SiGe Power Amplifier
摘要： This paper presents a wideband distributed power ampli?er that operates from 1-20 GHz. The peak output power is 19.5 dBm, with a peak PAE of 28% at 1 GHz. The power ampli?er utilizes a distributed ampli?er topology with arti?cial transmission lines, as well as transistor stacking, to achieve high output power and wide bandwidth. For the ampli?er core power cells, a stack-up of four SiGe HBTs was used to distribute the maximum voltage swing across the ampli?er. This power ampli?er, designed in a 90 nm SiGe BiCMOS platform, occupies an area of 1.95×1.3mm2.
关键词： wideband,SiGe HBTs,PAE,distributed power ampli?er,transistor stacking
更新于2025-09-23 15:19:57
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A Novel Perylene Derivative/Luminol Nanocomposite as Strong Electrochemiluminescence Emitter for Construction of Ultrasensitive MicroRNA Biosensor
摘要： In this work, an electrochemiluminescent (ECL) biosensor was constructed on the basis of amino-modified 3,4,9,10-perylenete-tracarboxylic dianhydride/luminol (PTC-NH2/Lu) nanocomposite as emitter and bipedal DNA walker signal amplification strategy for ultrasensitive detection of microRNA-21 (miRNA-21). The PTC-NH2/Lu nanocomposite was prepared as signal tag via π-π stacking molecular assembly, in which amino-modified 3,4,9,10-perylenete-tracarboxylic dianhydride (PTC-NH2) as a novel co-reaction accelerator significantly enhanced the ECL emission of luminol-H2O2 system. Moreover, target miRNA-21 triggered bipedal DNA walker was powered by toehold-mediated strand displacement reaction (TSDR) for signal amplification. Consequently, the proposed ECL biosensor achieved ultrasensitive detection of miRNA-21 with linear range from 100 aM to 100 pM and limit of detection 33 aM. Simultaneously, the biosensor was also successfully applied to detect target miRNA-21 in lysates from human cancer cells. As a result, this work constructed a new signal amplification platform, exhibiting great application potential in biomedical analysis and early clinical diagnostics.
关键词： PTC-NH2/Lu nanocomposite,electrochemiluminescence,co-reaction accelerator,π-π stacking molecular assembly,bipedal DNA walker
更新于2025-09-23 15:19:57
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Crystal Multi-Conformational Control Through Deformable Carbon-Sulfur Bond for Singlet-Triplet Emissive Tuning
摘要： Crystal-state luminophores have been of great interest in optoelectronics for years, whereas the excited state regulation at the crystal level is still restricted by the lack of control ways. We report that the singlet–triplet emissive property can be profoundly regulated by crystal conformational distortions. Employing fluoro-substituted tetrakis(arylthio)benzene luminophores as prototype, we found that couples of molecular conformations formed during different crystallizations. The deformable carbon–sulphur bond essentially drove the distortion of the molecular conformation and varied the stacking mode, together with diverse non-covalent interactions, leading to the proportional adjustment of the fluorescence and phosphorescence bands. This intrinsic strategy was further applied for solid-state multicolor emission and mechanoluminescence, probably offering new insights for design of smart crystal luminescent materials.
关键词： Luminescence,Crystal engineering,Noncovalent interactions,Molecular Stacking,Single-crystal conformation
更新于2025-09-19 17:15:36
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New perspective on the fluorescence and sensing mechanism of TNP chemosensor 2-(4,5-bis(4-chlorophenyl)-1H-imidazol-2-yl)-4-chlorolphenol
摘要： For TNP chemosensor 2-(4,5-Bis(4-Chlorophenyl)-1H-Imidazol-2-yl)-4-Chlorolphenol (HPICI), previous thought with no theoretical basis was that excited-state intramolecular proton transfer (ESIPT) process and the ground-state HPICI-TNP complex are mainly responsible for its fluorescence emission and the detection of TNP. However, this interpretation has been proved to be wrong by the present theoretical DFT/TDDFT explorations. Actually, the strong fluorescence of HPICI is mainly induced by the local excitation of the enol form HPICI(E) without ESIPT, and the fluorescence quenching by TNP is due to the photo-induced electron transfer (PET) process together with the cooperative effect of hydrogen-bonding interaction and π-π stacking interaction coexisting in the HPICI-TNP complex. The strengthened excited-state hydrogen bond promotes the PET process, thus facilitates the fluorescence quenching. This mechanism is proposed on the basis of the theoretical analyses on molecule geometry, binding energy, Gibbs free energy, electronic transitions, and frontier molecular orbitals (FMOs).
关键词： Fluorescence emission,Fluorescence quenching,Photo-induced electron transfer,Hydrogen-bonding interaction,Dynamical sensing mechanism,π-π stacking interaction
更新于2025-09-19 17:15:36
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Effect of Side-Chain Variation on Single-Crystalline Structures for Revealing the Structurea??Property Relationships of Organic Solar Cells
摘要： The molecular stacking assembly in the active layer plays a significant role in the photovoltaic performance of organic solar cells (OSCs). Here, we report two new small molecular donors with different side chains, FBT-O and FBT-H, and their corresponding fullerene-based OSCs. A slight change in the side chains led to a big difference in the power conversion efficiencies (PCEs). Although the molecular structures of the two donors are similar to each other, PCEs of the devices based on FBT-O were almost three times higher than those of the devices based on FBT-H, with manifold short-circuit current density, fill factor, as well as three orders of magnitude enhancement in the hole mobility. The difference in their single crystal structures was thoroughly investigated, whereby the FBT-O exhibited better planarity leading to appropriate phase separation and domain size. Furthermore, two-dimensional grazing-incidence wide-angle X-ray scattering results of the blend films revealed that the two donors retained a similar stacking structure as compared to the single-crystal structures, thus, establishing a clear relationship between the molecular stacking structure and the device performance.
关键词： side-chain modification,hole mobility,single crystal,molecular stacking structure
更新于2025-09-19 17:13:59
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Controlled synthesis of β-SiC with a novel microwave sintering method
摘要： b-SiC was synthesized with coal and sodium silicate as the raw materials via a novel microwave sintering method. The uniform heating and short production cycle makes the microwave sintering process more energy efficient. The structure and property of the prepared samples were characterized using XRD, FT-IR, XPS, TEM and HRTEM techniques. The size of nano-scaled b-SiC range from 70 to 300 nm in diameter and can be achieved 75.7% in the silicon carbide products under the condition of 1600 °C × 60 min with microwave controlling.
关键词： Microwave sintering,Stacking fault,b-SiC
更新于2025-09-16 10:30:52
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Hexylammonium Iodide Derived Two-Dimensional Perovskite as Interfacial Passivation Layer in Efficient Two-Dimensional/Three-Dimensional Perovskite Solar Cells
摘要： Defects locating within grain boundaries or on the film surface, especially organic cation vacancies and iodine vacancies make the fabrication of perovskite solar cells (PSCs) with superior performance a challenge. Organic ammonium iodide is a promising candidate and has been frequently used to passivate these defects by forming two-dimensional (2D) perovskite. In this work, it is found that the chain length of organic ammonium iodide is a crucial factor on the defect passivation effect. Compared to butylammonium iodide (BAI), hexylammonium iodide (HAI) derived 2D perovskite is more efficient in decreasing interfacial defects, resulting in a notably enhanced photoluminescence lifetime and a more suppressed interfacial charge recombination process. As a consequence, the ultimate power conversion efficiency (PCE) has reached 20.62% (3D+HAI) as compared to 18.83% (3D). Moreover, the long-term durability of the corresponding PSCs against humidity and heat is simultaneously improved. This work once again demonstrates that 2D/3D structure is promising for further improving the PCE and stability of PSCs.
关键词： perovskite solar cell,organic ammonium iodide,stability,interfacial passivation,2D/3D stacking structure
更新于2025-09-12 10:27:22