# Oxide Semiconductor for Advanced Memory Architectures: Atomic Layer Deposition, Key Requirement and Challenges

## TL;DR

This review explores how oxide semiconductors, deposited via atomic layer deposition, can be used in next-generation low-power memory devices and highlights the challenges in their integration.

## Contribution

The paper provides a comprehensive review of oxide semiconductors and ALD techniques for next-generation memory applications, emphasizing material design and integration challenges.

## Key findings

- Oxide semiconductors offer low leakage current and compatibility with 3D architectures, making them suitable for advanced memory devices.
- Atomic layer deposition enables precise growth of high-quality oxide semiconductor films with controllable properties.
- Key challenges include contact resistance, hydrogen instability, and the lack of p-type materials in oxide semiconductor memory applications.

## Abstract

This review outlines the emergence of oxide semiconductors as promising channel materials for high-density, low-power next-generation memory applications.Adsorption and reaction mechanisms of atomic layer deposition have enabled the design of high-performance oxide semiconductors for next-generation memory applications.This review discusses key challenges toward successfully integrating oxide semiconductors into next-generation memory devices.

This review outlines the emergence of oxide semiconductors as promising channel materials for high-density, low-power next-generation memory applications.

Adsorption and reaction mechanisms of atomic layer deposition have enabled the design of high-performance oxide semiconductors for next-generation memory applications.

This review discusses key challenges toward successfully integrating oxide semiconductors into next-generation memory devices.

Oxide semiconductors (OSs), introduced by the Hosono group in the early 2000s, have evolved from display backplane materials to promising candidates for advanced memory and logic devices. The exceptionally low leakage current of OSs and compatibility with three-dimensional (3D) architectures have recently sparked renewed interest in their use in semiconductor applications. This review begins by exploring the unique material properties of OSs, which fundamentally originate from their distinct electronic band structure. Subsequently, we focus on atomic layer deposition (ALD), a core technique for growing excellent OS films, covering both basic and advanced processes compatible with 3D scaling. The basic surface reaction mechanisms—adsorption and reaction—and their roles in film growth are introduced. Furthermore, material design strategies, such as cation selection, crystallinity control, anion doping, and heterostructure engineering, are discussed. We also highlight challenges in memory applications, including contact resistance, hydrogen instability, and lack of p-type materials, and discuss the feasibility of ALD-grown OSs as potential solutions. Lastly, we provide an outlook on the role of ALD-grown OSs in memory technologies. This review bridges material fundamentals and device-level requirements, offering a comprehensive perspective on the potential of ALD-driven OSs for next-generation semiconductor memory devices.