High Photoresponse in Hybrid Graphene-Carbon Nanotube Infrared Detectors

被引：48

作者：

Lu, Rongtao ^{[1
]}

Christianson, Caleb ^{[1
]}

Weintrub, Ben ^{[1
]}

Wu, Judy Z. ^{[1
]}

机构：

[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

来源：

ACS APPLIED MATERIALS & INTERFACES | 2013年 / 5卷 / 22期

基金：

美国国家科学基金会;

关键词：

graphene; carbon nanotube; infrared detector; photoresponse; PHOTOCONDUCTIVITY; PHOTODETECTOR;

D O I：

10.1021/am4033313

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Efficient exciton dissociation is crucial to obtaining high photonic response in photodetectors. This work explores implementation of a novel exciton dissociation mechanism through heterojunctions self-assembled at the graphene/MWCNT (multiwall carbon nanotube) interfaces in graphene/MWCNT nanohybrids. Significantly enhanced near-infrared photoresponsivity by nearly an order of magnitude has been achieved on the graphene/MWCNT nanohybrids as compared to the best achieved so far on carbon nanotube (CNT) only infrared (IR) detectors. This leads to a high detectivity up to 1.5 x 10(7) cm center dot Hz(1/2)center dot W-1 in the graphene/MWCNT nanohybrid, which represents a 500% improvement over the best D* achieved on MWCNT film IR detectors and may be further improved with optimization on the interfacial heterojunctions. This approach of the self-assembly of graphene/CNT nanohybrids provides a pathway toward high-performance and low-cost carbon nanostructure IR detectors.

引用

页码：11703 / 11707

页数：5

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