High-performance photodetectors based on Schottky junctions formed by vertical 2D-3D-2D graphene sandwich nanocavity and germanium substrate

Yingcheng Qiu, Shan Zhang, Guanglin Zhang, Zhengyi He, Xiaoqiang Feng, Fei Ding, Shiwei Tang*, Gang Wang

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Abstrakt

The inefficient light absorption and gapless features of two-dimensional graphene (2D-graphene) severely impact quantum yield and electron-hole recombination, limiting its suitability in optoelectronics. Herein, a bottom 2D-graphene directly on the Ge substrate by chemical vapor deposition (CVD), a middle 3D-graphene is synthesized in-situ using 2D-graphene as the buffer layer via plasma-enhanced chemical vapor deposition (PECVD). A top 2D-graphene is transferred to 2D/3D-graphene/Ge by thermal release tape (TRT) technology to form a vertical 2D/3D/2D graphene sandwich cavity on the Ge substrate. The bottom 2D-graphene layer can not only perform as an interfacial layer for the in-situ preparation of 3D-graphene but also increase the electrical conductivity of the interface and advance the character of the Schottky junction formed between 3D-graphene/Ge, thereby improving the photon detection. The fabricated photodetector exhibits outstanding characteristics at a 1550 nm wavelength, with a high responsivity of 1.4 A/W and detectivity of 1.1 × 1014 Jones. This is due to the enhanced light absorption of the sandwich cavity and a high-quality interface layer (bottom 2D-graphene). The results reveal that this vertical 2D/3D/2D graphene sandwich architecture will facilitate the development of graphene-based NIR detection.

OriginalsprogEngelsk
Artikelnummer109043
TidsskriftDiamond and Related Materials
Vol/bind126
Antal sider6
ISSN0925-9635
DOI
StatusUdgivet - jun. 2022

Bibliografisk note

Funding Information:
The authors acknowledge the financial support provided by the National Natural Science Foundation of China under Grant (No. 62174093 ), Natural Science Foundation of Zhejiang Province under Grant (No. LY19A040004 ), Villum Fonden (grant No. 37372 ), Independent Research Fund Denmark (project No. 1134-00010B ), and Natural Science Foundation of Ningbo under Grant (Nos. 202003N4097 and 2021J073 ). The authors declare no competing financial interest.

Publisher Copyright:
© 2022

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