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Author: search.filters.author.Tapia, J.Language: search.filters.language.English

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    Quantum dots in organic electronics: from solar cells to sensors
    (Elsevier, 2025)
    Quantum dots (QDs) feature optical and electronic properties that are determined by their size. This allows for tailored functionalities such as specific emission wavelengths, high photostability, and efficient charge transport, making QDs suitable for integration into electronic devices. Organic electronics represent an environmentally friendly alternative to traditional silicon-based technologies. However, organic electronic devices typically suffer from lower performance. This review examines the role of QDs in enhancing the performance of organic electronic devices, with a focus on solar cells, light-emitting diodes (LEDs), thin-film transistors (TFTs), and sensors. In solar cells, QDs enhance power conversion efficiency through optimized bandgap engineering. In LEDs, QDs contribute to superior color purity, and brightness. In TFTs, QDs help improve field-effect mobility and device stability. In sensors, QDs provide enhanced sensitivity and selectivity. This review aims to provide a comprehensive overview of how QDs are being leveraged to address the limitations of conventional organic electronic technologies.
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    Advancements in Molecular Sieves for Emerging Energy Applications
    (John Wiley and Sons, 2025)
    The limitations of traditional energy technologies have become increasingly evident as the demand for sustainable energy solutions rises, particularly concerning efficiency and environmental impact. In this context, molecular sieves (MS) emerge as key materials to improve the properties of these energy systems due to their porous structure and high surface area. These features make them ideal for their use as electrodes or separators in batteries and capacitors, while their ability to separate molecules based on size is helpful in fuel refining for fuel cells. Common types of MS include zeolites, metal-organic framework-based materials, carbon MS, and polymers of intrinsic microporosity. In this review, the applications of MS in energy storage and conversion systems are explored examining their roles in batteries, capacitors, fuel cells, and solar cells. The mechanisms behind the performance improvement of electrodes, electrolytes, and separators are reviewed, including the mitigation of dendrite formation, the increment in catalytic activity, and the increment of cycle durability, among others. By summarizing these advancements, this work aims to show an overview of the potential of MS in the development of novel components for the fabrication of long-lasting, efficient, and ecologically friendly energy storage and generation devices.
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    Triboelectric Nanogenerators Based on Ulvan Biopolymer: Impact of Lithium Sulfate Doping on Electrical Output
    (John Wiley and Sons, 2025)
    The increasing demand for sustainable energy solutions has driven extensive research into energy harvesting devices, such as triboelectric nanogenerators (TENGs). Although various additives, including nanowires and salts, have been investigated to enhance the performance of biopolymer-based TENGs, the use of lithium salts in green algae-based TENGs remains unexplored. Herein, a series of TENGs are fabricated using ulvan, a biopolymer derived from the green algae Ulva nematoidea. To improve the output performance of these TENGs, the ulvan matrix is doped with lithium sulfate (Li2SO4) at concentrations of 0%, 10%, 20%, 30%, 40%, and 50% by weight. Dielectric permittivity measurements are conducted to calculate the surface charge density. The results show an increase from 0.94 nC cm−2 for the pristine film to 1.14 nC cm−2 at 30 wt% Li2SO4, beyond which further increases in salt concentration lead to a decrease in charge density. The incorporation of salts significantly enhances the electrical performance, with the 20% Li2SO4/ulvan device achieving a maximum power density of 0.156 W m−2, representing an 85.7% improvement compared to the pristine ulvan TENG. The open-circuit voltage (Voc) and short-circuit current also increase with salt concentration, with Voc reaching 87.71 V at 30% Li2SO4.
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