Energetic alignment of buried junctions and tailored interfaces in photoelectrochemical multi-junction devices

光电化学多结器件中掩埋结和定制界面的能量对准

• 批准号: 424924805
• 负责人: Professor Dr. Thomas Hannappel
• 金额: --
• 依托单位: Fachgebiet Grundlagen von Energiematerialien
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/424924805?language=en
• 关键词: Energetic; alignment; buried; junctions; tailored

This project seeks to elucidate the electronic structure and energetic band alignment at the hetero-interfaces of photoelectrochemical multi-junction devices. Comprehension of the band energy diagrams of photoelectrochemical devices in the vicinity of the electrolyte with respect to their relative energetic position as well as the formation of electronic surface states will help to understand efficiency-limiting factors of the overall device. The coupling of absorbers to chemical and electronic passivation layers as well as co-catalysts will be systematically studied, primarily by electrochemical methods coupled in-vacuo to photoelectron spectroscopy. Density functional theory will allow an in-depth interpretation of experimental data, finally providing an atomistic view on the origin of energetic alignments. As the elementary processes of light absorption, charge-separation and -transfer, as well as multi-electron catalysis are highly interrelated, we will focus on two established water splitting multi-junction devices that have already demonstrated high efficiencies, but still have not reached the physical limits: silicon-based multi-junction as well as III-V compound semiconductor-based tandem cells. The hereby identified routes to modify the electronic coupling of the hetero-interfaces will, in close cooperation with the other partners, also be studied and evaluated under operating conditions. For the long-term perspective of the Research Consortium, this project will provide generalised research approaches that can be transferred to other high-efficiency multi-junction systems.

该项目旨在阐明光电化学多结器件异质界面的电子结构和能带排列。理解电解质附近光电化学器件的能带图及其相对能量位置以及电子表面态的形成将有助于理解整个器件的效率限制因素。将系统地研究吸收剂与化学和电子钝化层以及助催化剂的耦合，主要通过真空耦合到光电子能谱的电化学方法。密度泛函理论将允许对实验数据进行深入解释，最终提供关于能量排列起源的原子论观点。由于光吸收、电荷分离和转移以及多电子催化的基本过程是高度相关的，因此我们将重点关注两种已建立的水分解多结装置，它们已经表现出高效率，但仍未达到物理限制：硅基多结以及基于 III-V 化合物半导体的串联电池。特此确定的修改异质界面电子耦合的途径也将与其他合作伙伴密切合作，在操作条件下进行研究和评估。从研究联盟的长远角度来看，该项目将提供可转移到其他高效多结系统的通用研究方法。