Hybrid graphene-quantum dot phototransistors with ultrahigh gain.

Nature Nanotechnology
Gerasimos KonstantatosFrank H L Koppens

Abstract

Graphene is an attractive material for optoelectronics and photodetection applications because it offers a broad spectral bandwidth and fast response times. However, weak light absorption and the absence of a gain mechanism that can generate multiple charge carriers from one incident photon have limited the responsivity of graphene-based photodetectors to ∼10(-2) A W(-1). Here, we demonstrate a gain of ∼10(8) electrons per photon and a responsivity of ∼10(7) A W(-1) in a hybrid photodetector that consists of monolayer or bilayer graphene covered with a thin film of colloidal quantum dots. Strong and tunable light absorption in the quantum-dot layer creates electric charges that are transferred to the graphene, where they recirculate many times due to the high charge mobility of graphene and long trapped-charge lifetimes in the quantum-dot layer. The device, with a specific detectivity of 7 × 10(13) Jones, benefits from gate-tunable sensitivity and speed, spectral selectivity from the short-wavelength infrared to the visible, and compatibility with current circuit technologies.

References

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Citations

Dec 1, 2012·Accounts of Chemical Research·Johann CorauxVincent Bouchiat
Jan 29, 2013·Nano Letters·Xiaohong AnSwastik Kar
Mar 16, 2013·Nano Letters·L GaudreauF H L Koppens
Aug 14, 2013·Nano Letters·Sudipta DubeyMandar M Deshmukh
Sep 25, 2012·ACS Nano·Zheyu FangNaomi J Halas
Feb 12, 2013·ACS Nano·Fabiola IaconoRoberto Otero
May 25, 2013·ACS Nano·David ZhitomirskyEdward H Sargent
Jul 10, 2013·ACS Nano·Goki Eda, Stefan A Maier
Oct 23, 2013·Proceedings of the National Academy of Sciences of the United States of America·Deep JariwalaMark C Hersam
Oct 7, 2014·Nature Nanotechnology·F H L KoppensM Polini
Jan 23, 2016·ACS Applied Materials & Interfaces·Zhiyan JiaZhongyuan Liu
Dec 17, 2015·Nano Letters·Tim EchtermeyerAndrea C Ferrari
Dec 24, 2015·ACS Applied Materials & Interfaces·Chia-Wei ChiangYang-Fang Chen
Jan 19, 2016·Scientific Reports·Rongtao LuJudy Z Wu
Mar 5, 2016·Nanoscale Research Letters·Wei-Chu ShenYing-Sheng Huang
May 9, 2012·Nano Letters·Marco FurchiThomas Mueller
Dec 4, 2015·Scientific Reports·Yulu ChenZuimin Jiang
Nov 26, 2015·The Journal of Physical Chemistry Letters·Andres Castellanos-Gomez
Oct 7, 2015·Scientific Reports·Xinghan CaiMichael S Fuhrer
Sep 17, 2013·Scientific Reports·Jaeseok KimHyunyong Choi
Jul 8, 2014·Scientific Reports·Chang Oh KimEuyheon Hwang
Jan 24, 2014·Scientific Reports·Wenjing ZhangLain-Jong Li
Sep 4, 2015·Nano Letters·Guang-Wei DengGuo-Ping Guo
Mar 19, 2016·ACS Applied Materials & Interfaces·Jaehyun YangHyoungsub Kim
Sep 9, 2015·Nature Communications·Feng LiTom Wu
Jul 25, 2015·ACS Nano·Jing WuBarbaros Özyilmaz
Jul 29, 2015·Nano Letters·Jiayue TongJun Yan

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