Author(s): Li, Z (Li, Ze); Yuan, GD (Yuan, Guo-Dong); Zhang, D (Zhang, Di); Liu, YM (Liu, Yu-Meng); Long, HR (Long, Hao-Ran); He, L (He, Li); Wang, DC (Wang, De-Chen); Wei, ZM (Wei, Zhong-Ming); Luo, JW (Luo, Jun-Wei)

Source: SEMICONDUCTOR SCIENCE AND TECHNOLOGY Volume: 38  Issue: 11 Article Number: 115002  DOI: 10.1088/1361-6641/acf407  Published: NOV 1 2023 

Abstract: Quantum computing is expected to break the computing power bottleneck with the help of quantum superposition and quantum entanglement. In order to fabricate fault-tolerant quantum computers for encoding quantum information, it is important to improve the cryogenic mobility of silicon-based metal oxide semiconductor field effect transistors (MOSFETs) with a thin gate dielectric layer as much as possible. Based on a thin SiO2/HfO2 stacked dielectric, we investigate the effect of post-deposition annealing (PDA) temperature on the MOSFET cryogenic transport properties. The results show that silicon atoms will diffuse into the HfO2 to form silicates during PDA, leading to the HfO2 dielectric constant decrease. As the PDA temperature increases, the proportion of monoclinic hafnium oxide decreases and the tetragonal phase increases gradually. The oxygen vacancy content increases gradually, resulting in fixed charge density increases and the mobility decreases. The contribution of the forming gas annealing (FGA) to the mobility enhancement is clarified and the HfO2 recrystallization process is revealed from the perspective of long-time annealing. Finally, the mobility peak of silicon MOSFETs with thin SiO2/HfO2 dielectrics is enhanced to 1387 cm(2)(V.s)(-1) at 1.6 K, which provides a technical pathway for the development of silicon-based quantum computation.

Accession Number: WOS:001144960600001

Author Identifiers:

Author Web of Science ResearcherID     ORCID Number

wei, zhong ming      0000-0002-6237-0993

ISSN: 0268-1242

eISSN: 1361-6641