高效的电荷分离在各种光电系统中至关重要,但它仍然带来重大挑战。基于手性生物分子可以充当电子自旋过滤器的最新证据,本研究旨在将手性驱动电荷分离的应用从分子水平扩展到中尺度和超分子尺度。利用源自地球上最丰富的生物材料纤维素的纤维素纳米晶体 (CNC),本研究利用它们自组装成手性向列结构及其介电特性。介绍了一种器件,其特点是由 CNC 和量子点 (QD) 组成的手性向列杂化膜,用氧化铁纳米颗粒装饰。使用量子限制斯塔克效应 (QCSE) 探测电荷分离,我们揭示了对光的圆偏振和薄膜的手性向列结构的显着敏感性。这种方法实现了有效、持久的电荷分离,无论是在局部还是在超过 1 μm 的长度尺度上,都实现了潜在的应用,例如将光伏电池与电容相结合的自组装设备以及光学电场混合生物传感器。
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Chiral Nematic Cellulose Nanocrystal Films for Enhanced Charge Separation and Quantum-Confined Stark Effect
Efficient charge separation is essential in various optoelectronic systems, yet it continues to pose substantial challenges. Building upon the recent evidence that chiral biomolecules can function as electron spin filters, this study aims to extend the application of chirality-driven charge separation from the molecular level to the mesoscale and supramolecular scale. Utilizing cellulose nanocrystals (CNCs) derived from cellulose, the most abundant biomaterial on Earth, this research leverages their self-assembly into chiral nematic structures and their dielectric properties. A device is introduced featuring a chiral nematic hybrid film composed of CNCs and quantum dots (QDs), decorated with iron oxide nanoparticles. Using the quantum-confined Stark effect (QCSE) to probe charge separation, we reveal significant sensitivity to the circular polarization of light and the chiral nematic structure of the film. This approach achieves effective, long-lasting charge separation, both locally and across length scales exceeding 1 μm, enabling potential applications such as self-assembled devices that combine photovoltaic cells with electric capacitance as well as optical electric-field hybrid biosensors.