journal article·2024

A hidden phase uncovered by ultrafast carrier dynamics in thin Bi 2 O 2 Se

Hao Li, Adeela Nairan, Xiaoran Niu, Yuxiang Chen, Huarui Sun, Linqing Lai, Jingkai Qin, Leyang Dang, Guigen Wang, Usman Khan, Feng He

Nanoscale· Volume 16· Issue 8
Publisher page

Abstract

Bi2O2Se has attracted intensive attention due to its potential in electronics, optoelectronics, and ferroelectric applications. Despite that, there have only been a handful of experimental studies based on ultrafast spectroscopy to elucidate the carrier dynamics in Bi2O2Se thin films. Besides, different groups have reported various ultrafast timescales and associated mechanisms across films of different thicknesses. A comprehensive understanding in relation to thickness and fluence is still lacking. In this work, we have systematically explored the thickness-dependent Raman spectroscopy and ultrafast carrier dynamics in chemical vapor deposition (CVD)-grown Bi2O2Se thin films on a mica substrate with thicknesses varying from 22.44 nm down to 4.62 nm in both low and high pump fluence regions. Combining the thickness dependence and fluence dependence of the slow decay time, we demonstrate a hidden photoinduced ferroelectric transition in the thinner (<8 nm) Bi2O2Se films below the material damage thresholds, influenced by substrate-induced compressive strain and far-from-equilibrium excitation. Moreover, this transition can be manifested at high electronic excitation densities. Our results deepen the understanding of the interplay between the ferroelectric phase and semiconducting characteristics of Bi2O2Se thin films, offering potential applications in optoelectronic devices that benefit from the ferroelectric transition.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Ferroelectric and Piezoelectric Materials · Multiferroics and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory on Tunable Laser Technology, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, P. R. China

Guangdong Provincial Key Laboratory of Aerospace Communication and Networking Technology, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, P. R. China

Institute of Functional Porous Materials, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China

School of Science and Ministry of Industry and Information Technology, Key Laboratory of Micro-Nano Opto-electronic Information System, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, P. R. China

Sauvage Laboratory for Smart Materials, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, P. R. China

Shenzhen Key Laboratory for Advanced Materials, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, P. R. China

Funding

Science and Technology Planning Project of Shenzhen Municipality · China Postdoctoral Science Foundation · National Natural Science Foundation of China · Basic and Applied Basic Research Foundation of Guangdong Province

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