Flexible Broadband Graphene Photodetectors Enhanced by Plasmonic Cu3−        xP Colloidal Nanocrystals

Tian Sun; Yongjie Wang; Wenzhi Yu; Yusheng Wang; Zhigao Dai; Zeke Liu; Bannur Nanjunda Shivananju; Yupeng Zhang; Kai Fu; Babar Shabbir; Wanli Ma; Shaojuan Li; Qiaoliang Bao

doi:10.1002/smll.201701881

Flexible Broadband Graphene Photodetectors Enhanced by Plasmonic Cu₃₋ _xP Colloidal Nanocrystals

Tian Sun
, Yongjie Wang
, Wenzhi Yu
, Yusheng Wang
, Zhigao Dai
, Zeke Liu
, Bannur Nanjunda Shivananju
, Yupeng Zhang
, Kai Fu
, Babar Shabbir
, Wanli Ma
, Shaojuan Li
, Qiaoliang Bao

Materials Science & Engineering

Research output: Contribution to journal › Article › Research › peer-review

74 Citations (Scopus)

Abstract

The integration of graphene with colloidal quantum dots (QDs) that have tunable light absorption affords new opportunities for optoelectronic applications as such a hybrid system solves the problem of both quantity and mobility of photocarriers. In this work, a hybrid system comprising of monolayer graphene and self-doped colloidal copper phosphide (Cu₃₋ _xP) QDs is developed for efficient broadband photodetection. Unlike conventional PbS QDs that are toxic, Cu₃₋ _xP QDs are environmental friendly and have plasmonic resonant absorption in near-infrared (NIR) wavelength. The half-covered graphene with Cu₃₋ _xP nanocrystals (NCs) behaves as a self-driven p–n junction and shows durable photoresponse in NIR range. A comparison experiment reveals that the surface ligand attached to Cu₃₋ _xP NCs plays a key role in determining the charge transfer efficiency from Cu₃₋ _xP to graphene. The most efficient three-terminal photodetectors based on graphene-Cu₃₋ _xP exhibit broadband photoresponse from 400 to 1550 nm with an ultrahigh responsivity (1.59 × 10⁵ A W⁻¹) and high photoconductive gain (6.66 × 10⁵) at visible wavelength (405 nm), and a good responsivity of 9.34 A W⁻¹ at 1550 nm. The demonstration of flexible graphene-Cu₃₋ _xP photodetectors operated at NIR wavelengths may find potential applications in optical sensing, biological imaging, and wearable devices.

Original language	English
Article number	1701881
Number of pages	9
Journal	Small
Volume	13
Issue number	42
DOIs	https://doi.org/10.1002/smll.201701881
Publication status	Published - 13 Nov 2017

Keywords

broadband
Cu P
flexibility
graphene
photodetector

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10.1002/smll.201701881

Cite this

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abstract = "The integration of graphene with colloidal quantum dots (QDs) that have tunable light absorption affords new opportunities for optoelectronic applications as such a hybrid system solves the problem of both quantity and mobility of photocarriers. In this work, a hybrid system comprising of monolayer graphene and self-doped colloidal copper phosphide (Cu3− xP) QDs is developed for efficient broadband photodetection. Unlike conventional PbS QDs that are toxic, Cu3− xP QDs are environmental friendly and have plasmonic resonant absorption in near-infrared (NIR) wavelength. The half-covered graphene with Cu3− xP nanocrystals (NCs) behaves as a self-driven p–n junction and shows durable photoresponse in NIR range. A comparison experiment reveals that the surface ligand attached to Cu3− xP NCs plays a key role in determining the charge transfer efficiency from Cu3− xP to graphene. The most efficient three-terminal photodetectors based on graphene-Cu3− xP exhibit broadband photoresponse from 400 to 1550 nm with an ultrahigh responsivity (1.59 × 105 A W−1) and high photoconductive gain (6.66 × 105) at visible wavelength (405 nm), and a good responsivity of 9.34 A W−1 at 1550 nm. The demonstration of flexible graphene-Cu3− xP photodetectors operated at NIR wavelengths may find potential applications in optical sensing, biological imaging, and wearable devices.",

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author = "Tian Sun and Yongjie Wang and Wenzhi Yu and Yusheng Wang and Zhigao Dai and Zeke Liu and Shivananju, \{Bannur Nanjunda\} and Yupeng Zhang and Kai Fu and Babar Shabbir and Wanli Ma and Shaojuan Li and Qiaoliang Bao",

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AU - Wang, Yusheng

AU - Dai, Zhigao

AU - Liu, Zeke

AU - Shivananju, Bannur Nanjunda

AU - Zhang, Yupeng

AU - Fu, Kai

AU - Shabbir, Babar

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AU - Li, Shaojuan

AU - Bao, Qiaoliang

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Flexible Broadband Graphene Photodetectors Enhanced by Plasmonic Cu₃₋ _xP Colloidal Nanocrystals

Abstract

Keywords

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ARC Centre of Excellence in Future Low-energy Electronics Technologies

Cite this

Flexible Broadband Graphene Photodetectors Enhanced by Plasmonic Cu3− xP Colloidal Nanocrystals

Abstract

Keywords

Access to Document

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Projects

ARC Centre of Excellence in Future Low-energy Electronics Technologies

Cite this

Flexible Broadband Graphene Photodetectors Enhanced by Plasmonic Cu₃₋ _xP Colloidal Nanocrystals