Optically Controlled Charge Trapping Memory Based on Spin Coated Hafnium Diselenide Flakes

Bashayr Alqahtani, Nazek Elatab

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper demonstrates the seamless fabrication of optoelectronic memory by integrating HfSe 2 as a charge-trapping layer in a MOS memory structure. Through a spin coating technique, solution-processable HfSe 2 flakes with average thicknesses of 2 nm were deposited between the tunneling and blocking oxide layers. The charge-trapping material distribution and thickness were explored by Atomic Force Microscopy and X-ray Diffraction Spectroscopy. The electrical characterization of MOS memory revealed a memory window of 5.5 Volts under ±16 Volts biasing. Furthermore, the memory endurance exceeds 10 4 electrical programming and erasing cycles. The retention test performed at room temperature showed that the memory device is expected to lose only 10% of the stored charges after 10 years. Under light stimuli (405nm wavelength and output power ~ 20 mW) with electrical readout voltage, the MOS memory showed an increase in the memory window from 5.5 Volts to 6.5 Volts.
Original languageEnglish (US)
Title of host publication2023 IEEE 23rd International Conference on Nanotechnology (NANO)
StatePublished - Jul 2 2023


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