Low-temperature processed beta-phase In2Se3 ferroelectric semiconductor thin film transistors

As scaling becomes increasingly difficult, there is growing interest in vertical or three-dimensional stacking of transistors and especially memory. Ferroelectric semiconductor field effect transistors can be key enablers to improve energy efficiency and overall chip and memory performance. In this work, low-temperature processed, back-end-of-the-line compatible transistors were demonstrated by depositing a layered chalcogenide ferroelectric semiconductor, beta-phase In2Se3, at temperature as low as 400 degrees C. Top gate n-channel In2Se3 thin film transistors were fabricated with field-effect mobility similar to 1 cm(2) V-1 s(-1), and simple polarization switching based memory results are presented.

Automated summary

This study demonstrates low-temperature processed transistors compatible with the back-end-of-the-line, which provides a new approach for improving energy efficiency and chip performance.