2021/10/24 by Nazmul Hasan, Yixiong Zheng, Hasan, Md Nazmul +15
Engineering · #Advancements in Semiconductor Devices and Circuit Design #Applied Physics (physics.app-ph) #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Nanowire Synthesis and Applications #Semiconductor materials and devices
paper · pdf · doi:10.48550/arxiv.2110.12496
openalex publication_date 2021/10/24 · openalex created_date 2021/11/08 · openalex updated_date 2026/07/28
The structure property of non-ideal Si/GaAs heterostructures that were integrated with the ultra-thin oxide (UO) tunneling interfacial layer has been systematically investigated. Si nanomembranes (NMs) were oxidized in different time periods prior to the hetero-integration process to create the non-ideal single-side passivated Si/GaAs heterostructure. The atomic level oxygen distribution and the degree of oxygen content in Si NM and GaAs were carefully investigated using the atom probe tomography (APT) and X-ray photoelectron spectroscopy (XPS) to trace the changes in chemical composition and reactional mechanism across the UO interface when the surface of Si NM was exposed to air for different period of time. The negatively induced charges at the UO layer caused the oxygen diffusion to GaAs layer and formed the unwanted GaAs oxide layer. This native oxide stack noticeably degraded the thermal properties of the Si/GaAs heterostructure as Si NMs were more oxidized. This study revealed that the poor surface passivation on the one side of the heterointerface leads to a both-side oxidation, thus severely deteriorating the transport properties across the heterojunction that is formed with the UO layer.