Environment-friendly 0D/2D nanocomposites for broadband UV-vis-NIR-sensitive photodetectors

新的无有毒金属的多硫系量子点和易于获得的、稳定的半导体和导电的二维纳米片的引入，将有力地推动基于0D纳米晶体（量子点- QDs）和2D少层和单层材料异质结构的新型宽带敏感和自供电光电探测器的发展。本项目的重点是新的可靠的水合成多Cu(Ag)-In-Se和Cu- zn - sn -se量子点的方案，控制组成/尺寸，这些量子点的形态和光物理性质之间的关系，以及以单层还原氧化石墨烯（RGO）和氮化碳（SLCN）片作为自供电光电探测器组件的金属硒化量子点的0D/2D复合材料的光诱导电荷转移动力学。该项目结合了几个相互关联的研究任务，包括(i)制备水溶性成分和尺寸选择的Cu(Ag)- in -se和Cu- zn - sn -se量子点；（ii）详细研究这些量子点及其与SLCN和RGO的复合材料的电学和光物理性质；（iii）深入了解量子点和二维基团之间光致电子转移的机制/动力学，这取决于量子点的大小/组成和RGO和SLCN的受体性质；（iv）选择最有前途的0D/2D异质结构作为自供电光电探测器的uv -vis- nir敏感元件。该项目具有独特的概念验证特征，将为设计具有高品质的新型自供电光电探测器提供基本基础。它还有望对新的“绿色”合成vis- nir发光量子点、具有良好磁性和热电性的硫系0D材料以及人工光合过程的宽带敏感光催化剂的发展产生显著影响。

The development of new broadband-sensitive and self-powered photodetectors based on heterostructures of 0D nanocrystalline (quantum dots - QDs) and 2D few-layer and single-layer materials can be strongly boosted by the introduction of new toxic-metal free multinary chalcogenide QDs and readily available, stable semiconducting and conducting 2D nanosheets. The present project focuses on new reliable protocols of aqueous synthesis of multinary Cu(Ag)-In-Se and Cu-Zn-Sn-Se QDs with controlled composition/size, the relationships between the morphology and photophysical properties of such QDs, and the dynamics of photoinduced charge transfer in 0D/2D composites of metal-selenide QDs with single-layer reduced graphene oxide (RGO) and carbon nitride (SLCN) sheets as components of self-powered photodetectors. The project combines several inter-related research tasks, including (i) preparation of water-soluble composition- and size-selected Cu(Ag)-In-Se and Cu-Zn-Sn-Se QDs; (ii) detailed investigation of the electro- and photophysical properties of such QDs as well as their composites with SLCN and RGO; (iii) gaining deep insights into the mechanisms/dynamics of the photoinduced electron transfer between QDs and 2D moieties depending on the QD size/composition and acceptor properties of RGO and SLCN; (iv) selection of the most promising 0D/2D heterostructures as UV-vis-NIR-sensitive elements of self-powered photodetectors.This project has a distinct proof-of-concept character and will provide a fundamental basis for the design of new self-powered photodetectors with high figures of merit. It is also expected to have a marked impact on the development of new „green“ syntheses of vis-NIR-luminescing QDs, chalcogenide 0D materials with promising magnetic and thermoelectric properties, as well as broadband-sensitive photocatalysts of artificial photosynthetic processes.