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开关设备的异互相处的电子结构和能量带对齐。在电解质附近相对于其相对能量位置以及电子表面状态的形成，对光电化学设备的带能图理解将有助于了解整体设备的效率限制因子。将系统研究吸收剂与化学和电子钝化层以及共催化剂的耦合，主要通过与光电子光谱耦合的电化学方法结合。密度功能理论将允许对实验数据的深入解释，最终提供对能量比对的起源的原子观点。 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.特此确定了修改异性互联面的电子耦合的途径，还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。对于研究联盟的长期角度，该项目将提供可以转移到其他高效多型系统系统的广义研究方法。