Ultrafast Spectroscopy on Metastable Bulk and Heterostructure Semiconductor Compounds

亚稳态块体和异质结构半导体化合物的超快光谱分析

• 批准号: 5379581
• 负责人: Professor Dr. Wolfgang W. Rühle
• 金额: --
• 依托单位: Fachbereich 13: Physik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5379581?language=en
• 关键词: Ultrafast; Spectroscopy; Metastable; Bulk; Heterostructure

The following relaxation processes of optically excited carriers in metastable semiconductor compounds and their heterostructures are studied by time-resolved spectroscopy: dephasing, thermalization, capture from barriers into quantum wells, cooling, and recombination as well as the spatio-temporal evolution of excitation. Experimental techniques are pump-probe experiments, time-resolved photoluminescence, and eventually four-wave-mixing experiments. The aim is to study in these compounds the influence of the strongly modified conduction band on carrier relaxation where the specific band structure is prepared by the corresponding sample growth and treatment. The experiments will be started with (GaIn)(NAs)/GaAs in the first period but can be expanded to (GaIn)(NP)/GaP in the next period.

用时间分辨光谱研究了亚稳态半导体化合物及其异质结中光激发载流子的下列弛豫过程：退相、热化、势垒俘获到量子阱、冷却、复合以及激发的时空演化。实验技术包括泵浦探测实验、时间分辨光致发光实验以及最终的四波混频实验。目的是研究这些化合物中强修饰导带对载流子弛豫的影响，其中特定的能带结构是通过相应的样品生长和处理而形成的。实验将从第一个周期的(增益)(Nas)/GaP开始，但在下一个周期可以扩展到(增益)(Np)/GaP。