Light Trapping in Conformal Graphene/Silicon Nanoholes for High-Performance Photodetectors
- 25 July 2019
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 11 (33), 30421-30429
- https://doi.org/10.1021/acsami.9b08268
Abstract
Hybrid graphene/silicon heterojunctions have been widely ultilized in photodtectors, due to their unque characteristics of high sensitivity, fast response and CMOS-compatibility. However, the photoresponse is restricted by the high reflectance of planar silicon (up to 50%). Herein, an improved graphene/Si detector with excellent light absorption performance is proposed and demonstrated by directly growing graphene on the surface of silicon nanoholes (SiNHs). It is shown that the combination of SiNHs with conformal graphene provides superior interfaces for efficient light trapping and transport of the photoexcited carriers. A high absorption up to 90% was achieved, and the conformal graphene/SiNHs based photodetectors exhibited a higher photoresponsivity (2720 A/W) and faster response (~6.2 μs), comparing with the counterpart of the planar graphene/Si, for which the corresponding values are 850 A/W and 51.3 μs. These results showcase the vital role of the material morphology in optoelectronic conversion, and pave the way to explore novel high-performance heterojunction photodetectors.Keywords
Funding Information
- Chongqing Science and Technology Commission (cstc2016jcyjA0315, cstc2017shmsA1471)
- National Natural Science Foundation of China (11574308)
- Chinese Academy of Sciences
This publication has 51 references indexed in Scilit:
- Progress, Challenges, and Opportunities for 2D Material Based PhotodetectorsAdvanced Functional Materials, 2018
- All‐Layered 2D Optoelectronics: A High‐Performance UV–vis–NIR Broadband SnSe Photodetector with Bi2Te3 Topological Insulator ElectrodesAdvanced Functional Materials, 2017
- Photodetectors Based on Two‐Dimensional Layered Materials Beyond GrapheneAdvanced Functional Materials, 2016
- Stable, highly-responsive and broadband photodetection based on large-area multilayered WS2 films grown by pulsed-laser depositionNanoscale, 2015
- Quantum Carrier Reinvestment-Induced Ultrahigh and Broadband Photocurrent Responses in Graphene–Silicon JunctionsACS Nano, 2014
- Photodetectors based on graphene, other two-dimensional materials and hybrid systemsNature Nanotechnology, 2014
- Graphene photodetectors with ultra-broadband and high responsivity at room temperatureNature Nanotechnology, 2014
- Graphene photodetectors for high-speed optical communicationsNature Photonics, 2010
- The rise of grapheneNature Materials, 2007
- Two-dimensional gas of massless Dirac fermions in grapheneNature, 2005