量子点改性多元异质结型ZnO基一维纳米结构阵列制备及其光能转化特性研究

Quantum-dots-modificated 1D nanostructure array with multi-component semiconductors heterojunction exhibits significant application potential in photoelectronic materials and devices. Further study is very necessary for this system to control the construction of nanostructures, improve the quality of interface in heterojunction, design the components of highly efficient light absorber, analyze the property of charge transport, and so on. In this project, we plan to adopt a simple technological process of solution phase synthesis to build a single crystal [0001] oriented ZnO 1D hierarchical nanostructure array with improved antireflective performance, which is further modified with low-cost inorganic narrow bandgap semiconductor quantum dots. And finally, we hope to obtain series of novel 1D nanostructured array with multi-component semiconductors heterojunction, such as ZnO/CdS/Cu2-xS, ZnO/PbS/Cu2-xS and ZnO/CdSe/Cu2-xSe. Furthermore, it is important to explore the controllable synthesis process and the optimized system parameters. Besides, it is particularly significant to have research on the localized surface plasmon resonance effect of Cu2-xS nanocrystals, the relation between components of heterojunction and the band alignments, the interface contact, and the optical modulation effect for modified 1D hierarchical nanostructures. Moreover, we should demonstrate the influence mechanisms of these issues on properties of charge transport, light harvesting, and photo-energy conversion in systems, which could provide some useful informations and scientific basis to further enhance the energy conversion efficiency of quantum-dots solar cells.

量子点改性的多元异质结型一维纳米结构阵列在光电材料与器件领域具有重要的应用前景，对于其纳米尺度结构控制、异质结界面接触、高效吸光组分设计、电荷输运特性等问题还值得进一步研究。本课题中，我们拟以简单的溶液合成路线为主，在抗反射增强的[0001]取向单晶ZnO分等级一维纳米结构阵列上负载廉价的窄带隙无机量子点等，形成如：ZnO/CdS/Cu2-xS、ZnO/PbS/Cu2-xS、ZnO/CdSe/Cu2-xSe等一系列多种组态形式的新型三元异质结一维纳米结构体系。探索人工可控合成与设计该体系的优化条件，并着重研究Cu2-xS纳米晶的局域表面等离子共振效应、异质结组分和能带位置关系、界面接触、改性一维分等级纳米结构的光学调制作用等问题对体系的电荷输运、光吸收、光能转换等性质的影响规律。为实现量子点太阳能电池光电转换效率的提高提供信息和科学依据。