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On-demand tuning of charge accumulation and carrier mobility in quantum dot solids for electron transport and energy storage devices
摘要： Assemblies of colloidal quantum dots (CQDs) are attractive for a broad range of applications because of the ability to exploit the quantum con?nement effect and the large surface-to-volume ratio due to their small dimensions. Each application requires different types of assemblies based on which properties are intended to be utilized. Greater control of assembly formation and optimization of the related carrier transport characteristics are vital to advance the utilization of these materials. Here, we demonstrate on-demand control of the assembly morphology and electrical properties of highly crosslinked CQD solids through the augmentation of various assembly methods. Employment of electric-double-layer (EDL) gating on these assembly structures (i.e., an amorphous assembly, a hierarchical porous assembly, and a compact superlattice assembly) reveals their intrinsic carrier transport and accumulation characteristics. Demonstrations of high electron mobility with a high current modulation ratio reaching 105 in compact QD ?lms and of a record-high areal capacitance of 400 μF/cm2 in an electric-double-layer supercapacitor with very thin (<100 nm) QD hierarchical porous assemblies signify the versatility of CQDs as building blocks for various modern electronic devices.
关键词： electron transport,electric-double-layer gating,energy storage devices,carrier mobility,colloidal quantum dots
更新于2025-09-23 15:21:01
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Multifunctional behavior of Ca-doped niobium-based double perovskite for photovoltaic/solar cell devices
摘要： Smart materials of oxide ceramics are usually in the form of single- or polycrystalline. The present ceramic belongs to the polycrystalline compound of Pb1.5Ca0.5BiNbO6 which has a double perovskite structure with the general form of A1.5A′0.5BB′O6. For synthesis and characterization of the sample, a solid solution casting method, X-ray diffraction, scanning electron micrography, Infra-red spectroscopy, etc., have been utilized. Different characterization reveals that the material has a higher value of room-temperature dielectric constant remnant polarization useful for energy storage devices. Optical equities of the ceramic were further analysed by UV–Vis and PL spectroscopy analysis which reveals that the material can be useful for energy harvesting devices like photovoltaic/solar cells. The estimated thermistor parameter suggests that the material can also be useful for thermal sensor devices.
关键词： Photovoltaic/solar cell devices,Energy storage devices,Ca-doped niobium-based double perovskite,Multifunctional behavior,Thermal sensor devices
更新于2025-09-23 15:19:57