High-Performance Photodetectors Based on Suspended Ultralong Carbon Nanotubes.

IF 15.8 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY ACS Nano Pub Date : 2024-09-10 Epub Date: 2024-08-26 DOI:10.1021/acsnano.4c08176
Qinyuan Jiang, Kangkang Wang, Fei Wang, Khaixien Leu, Run Li, Yanlong Zhao, Aike Xi, Yonglu Zang, Rufan Zhang
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Abstract

Photodetectors are in huge demand in multiple fields, such as remote sensing, chemical detection, security, and medical imaging. Carbon nanotubes (CNTs) are promising candidates for high-performance photodetectors due to their extraordinary optical and electrical properties. However, the performance of previously reported CNT-based photodetectors is far from the intrinsic photoelectrical properties of CNTs because of the noncontinuous lengths, structural defects, and unsatisfactory structural design of the previously used short CNTs. The key to improving the performance of CNT-based photodetectors is to increase the length and structural quality of the CNTs. Herein, high-performance photodetectors were fabricated by using high-density suspended ultralong CNTs (SUCNTs). The suspended structures of ultralong CNTs not only reduced the electron-phonon interactions generated by substrates but also largely avoided bolometric effects through efficient heat dissipation. Moreover, the characteristics of high areal density and defect-free structures of SUCNTs could increase the effective absorption areas and improve their carrier mobility, resulting in enhanced photoconductive responses. Consequently, compared with the nonsuspended short CNTs, the SUCNT-based photodetectors achieved significantly improved photodetection performance, such as high responsivity (0.181 A W-1), detectivity (1.20 × 109 cm Hz1/2 W-1), ultrafast response (0.13 ms), and broad detection range (405-850 nm).

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基于悬浮超长碳纳米管的高性能光电探测器
光电探测器在遥感、化学检测、安全和医学成像等多个领域都有着巨大的需求。碳纳米管(CNT)具有非凡的光学和电学特性,是高性能光电探测器的理想候选材料。然而,之前报道的基于碳纳米管的光电探测器的性能与碳纳米管的内在光电特性相去甚远,原因是之前使用的短碳纳米管长度不连续、存在结构缺陷以及结构设计不尽人意。提高基于 CNT 的光电探测器性能的关键在于增加 CNT 的长度和结构质量。本文利用高密度悬浮超长碳纳米管(SUCNTs)制造了高性能光电探测器。超长 CNT 的悬浮结构不仅减少了基底产生的电子-声子相互作用,还通过高效散热在很大程度上避免了螺栓效应。此外,SUCNTs 的高磁场密度和无缺陷结构的特点可以增加其有效吸收面积并提高其载流子迁移率,从而增强光电导响应。因此,与非悬浮短 CNT 相比,基于 SUCNT 的光电探测器的光电探测性能有了显著提高,如高响应率(0.181 A W-1)、探测率(1.20 × 109 cm Hz1/2 W-1)、超快响应(0.13 ms)和宽探测范围(405-850 nm)。
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来源期刊
ACS Nano
ACS Nano 工程技术-材料科学:综合
CiteScore
26.00
自引率
4.10%
发文量
1627
审稿时长
1.7 months
期刊介绍: ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.
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