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Metala??organic framework nanosheets for enhanced performance of organic photovoltaic cells
摘要： Metal-organic nanosheets (MONs) are an emerging class of two-dimensional materials whose diverse and readily tunable structures make them ideal for use in optoelectronic applications. Here, liquid exfoliation is used to synthesize ultrathin zinc-porphyrin based MONs with electronic and optical properties ideally suited for incorporation into a polythiophene-fullerene (P3HT-PCBM) organic solar cell. Remarkably, the addition of MONs to the photoactive layer of a photovoltaic device results in a power conversion efficiency of 5.2%, almost twice that for reference devices without nanosheets with a simultaneous improvement of Jsc, Voc and FF. Our analysis indicates that the complimentary electronic, optical and structural properties of the MONs allows them to act as a surface to template the crystallization of P3HT leading to a doubling of the absorbance, a tenfold increase in hole mobility and reduced grain size. These results demonstrate the potential of MONs as a tunable class of two-dimensional materials for enhancing the performance of a broad range of organic solar cells and other electronic devices.
关键词： Metal-organic nanosheets,organic photovoltaic cells,power conversion efficiency,liquid exfoliation,zinc-porphyrin
更新于2025-09-19 17:13:59
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CsPbBr <sub/>3</sub> Quantum Dots as Artificial Antennas to Enhance the Light-Harvesting Efficiency and Photoresponse of Zinc Porphyrin
摘要： Broadening the spectral range and enhancing the efficiency of light-harvesting materials are important to the design of novel optoelectronic devices. In this work, CsPbBr3 quantum dots (QDs) are introduced as artificial antennas to enhance both the light-harvesting efficiency and photoresponse of zinc porphyrin (ZnP). The Fluorescence Resonance Energy Transfer (FRET) process both in solution and films from the donor CsPbBr3 QD to the acceptor ZnP have been systematically investigated, and an energy transfer efficiency over 70% in solution and a high optical sensitivity have been realized with the optimal of QD/ZnP ratio on films. A photocurrent density of up to 1.00×10-4 A·cm-2 can be achieved for the QD/ZnP film, and the corresponding on/off photocurrent value can be increased by two orders of magnitude compared with that of ZnP. Furthermore, the as-prepared light-harvesting film also demonstrates a high optical sensitivity at the optimal QD/ZnP ratio. Our research provides an effective way for designing and improving the QD/ZnP “antenna” for solar-energy harvesting devices.
关键词： Zinc Porphyrin,CsPbBr3 Quantum Dots,FRET,Photoresponse,Light-Harvesting Efficiency
更新于2025-09-19 17:13:59
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“Turn off-on” fluorescent sensor based on quantum dots and self-assembled porphyrin for rapid detection of ochratoxin A
摘要： We report herein a “turn off-on” fluorescent sensor based on ZnCdSe quantum dots (ZnCdSe QDs) and self-assembled zinc porphyrin for sensitive and rapid detection of ochratoxin A (OTA). Using environmentally friendly dodecyl dimethyl betaine as “soft template”, zinc 5, 10, 15, 20-tetra(4-pyridyl)-21H-23H-porphine (ZnTPyP) was self-assembled into nanorods (SA-ZnTPyP) through a green process. The OTA detection process involves two steps: (1) the fluorescence of ZnCdSe QDs is significantly quenched by SA-ZnTPyP, and (2) the combination between SA-ZnTPyP and OTA releases ZnCdSe QDs from their quenchers such that the fluorescence is recovered. Under the optimized experimental conditions, the newly developed fluorescent sensor showed a linear response in concentration range 0.5–80 ng mL?1, with a detection limit of 0.33 ng mL?1. The excellent applicability of the system has been verified in milk and coffee samples, with relative recoveries between 98.33% and 103.70%. The proposed fluorescent sensor exhibits excellent selectivity and high sensitivity, and thus could be a promising tool for on-site determination of OTA in food safety control and environmental monitoring.
关键词： Turn off-on,Self-assembled zinc porphyrin,Ochratoxin A,Quantum dots
更新于2025-09-16 10:30:52
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Chiroptical Protocol for the Absolute Configurational Assignment of Alkyl-Substituted Epoxides Using Bis(zinc porphyrin) as a CD-Sensitive Bidentate Host
摘要： The absolute configurations of simple alkyl-substituted chiral epoxides not bearing other ligating groups are readily determined via the exciton-coupled circular dichroism (ECCD) protocol using a bidentate bis(zinc porphyrin) host system BP1 as a CD-sensitive chirality probe. In this situation, chiral epoxides can successfully be incorporated into the cleft of the V-shaped host BP1 by double coordination of both oxygen lone pairs of the guest to the two central zinc ions of the host. We also propose a working model based on an MM2 optimized structure of the substrates that enables nonempirical prediction of the chirality of the bound epoxide.
关键词： chirality probe,alkyl-substituted epoxides,bis(zinc porphyrin),absolute configurations,exciton-coupled circular dichroism
更新于2025-09-04 15:30:14