Tunable lattice dynamics and dielectric functions of two-dimensional Bi2O2Se: striking layer and temperature dependent effects

激子 材料科学 电介质 声子 堆积 半导体 凝聚态物理 带隙 光电子学 物理 核磁共振
作者
Yafang Li,Kai Dai,Lichen Gao,Jinzhong Zhang,Anyang Cui,Kai Jiang,Yawei Li,Liyan Shang,Liangqing Zhu,Zhigao Hu
出处
期刊:Nanoscale [Royal Society of Chemistry]
卷期号:15 (5): 2323-2331 被引量:4
标识
DOI:10.1039/d2nr05775a
摘要

Two-dimensional (2D) Bi2O2Se semiconductors with a narrow band gap and ultrahigh mobility have been regarded as an emerging candidate for optoelectronic devices, whereas the ambiguous phonon characteristics and optical properties still limit their future applications. Herein, high-quality centimeter-scale 2D Bi2O2Se films are successfully synthesized to disclose the lattice dynamics and dielectric functions under the control of thickness and temperature. It has been demonstrated that the stronger electrostatic Bi-Se interactions result in a stiffened phonon vibration of thicker Bi2O2Se layers. Three excitons (Ea, Eb, and Ec) exhibit significant red shifts with layer stacking. Interestingly, the dielectric properties in the visible-near infrared region (Ea and Eb) are dominated by the combined effect of the joint density of states and mass density, whereas the dielectric properties in the ultraviolet region (Ec) are dominated by the exciton effect. Furthermore, the temperature-sensitivity of the phonon frequency and exciton transition energies is revealed to be layer-dependent. In particular, the optical response of Eb excitons exhibits a prominent dependence on temperature, which indicates a promising optical modulation by temperature in the visible spectrum. This study enriches the knowledge about phonon dynamics and dielectric properties for 2D Bi2O2Se, which provides an essential reference for high-performance related optoelectronic devices.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
科研剧中人完成签到,获得积分0
刚刚
张雯雯发布了新的文献求助10
刚刚
刚刚
科科完成签到 ,获得积分10
1秒前
Besty发布了新的文献求助10
1秒前
蓝桉发布了新的文献求助10
2秒前
有魅力枫叶完成签到,获得积分20
3秒前
共享精神应助大胆的雪一采纳,获得10
3秒前
yushxi87完成签到,获得积分10
3秒前
3秒前
ddy发布了新的文献求助10
3秒前
超级馒头应助Fay采纳,获得10
4秒前
4秒前
4秒前
biubiu发布了新的文献求助30
4秒前
暖暖完成签到,获得积分10
4秒前
朴实觅波完成签到,获得积分10
4秒前
欢喜的晓霜完成签到 ,获得积分10
6秒前
6秒前
7秒前
淡淡的豁应助苏逊采纳,获得30
7秒前
7秒前
7秒前
8秒前
LLL完成签到,获得积分10
8秒前
穆佳琴发布了新的文献求助10
8秒前
8秒前
9秒前
9秒前
张小哥12发布了新的文献求助10
9秒前
10秒前
10秒前
JamesPei应助ff采纳,获得10
11秒前
ANG完成签到 ,获得积分10
11秒前
rengar发布了新的文献求助10
11秒前
超级馒头应助nengzou采纳,获得10
11秒前
77完成签到 ,获得积分10
12秒前
乌龟娟发布了新的文献求助10
12秒前
jiaojiao完成签到 ,获得积分10
12秒前
12秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Picture Books with Same-sex Parented Families: Unintentional Censorship 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3970632
求助须知:如何正确求助?哪些是违规求助? 3515261
关于积分的说明 11177794
捐赠科研通 3250448
什么是DOI,文献DOI怎么找? 1795314
邀请新用户注册赠送积分活动 875781
科研通“疑难数据库(出版商)”最低求助积分说明 805073