Integrating an electrically active colloidal quantum dot photodiode with a graphene phototransistor

The realization of low-cost photodetectors with high sensitivity, high quantum efficiency, high gain and fast photoresponse in the visible and short-wave infrared remains one of the challenges in optoelectronics. Two classes of photodetectors that have been developed are photodiodes and phototransis...

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Published in:Nature communications 2016-06, Vol.7 (1), p.11954-11954, Article 11954
Main Authors: Nikitskiy, Ivan, Goossens, Stijn, Kufer, Dominik, Lasanta, Tania, Navickaite, Gabriele, Koppens, Frank H. L., Konstantatos, Gerasimos
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Language:English
Subjects:
639/301/1005/1007
639/766/25
639/925
Bandwidths
Electrodes
Electrons
Graphene
Humanities and Social Sciences
multidisciplinary
Quantum dots
Science
Science (multidisciplinary)
Sensors
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cited_by cdi_FETCH-LOGICAL-c512t-b998e9c0b04847d276f8dbddcd40a23d9e9546f08a31b06d945e49f863e5d71e3
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container_title Nature communications
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description The realization of low-cost photodetectors with high sensitivity, high quantum efficiency, high gain and fast photoresponse in the visible and short-wave infrared remains one of the challenges in optoelectronics. Two classes of photodetectors that have been developed are photodiodes and phototransistors, each of them with specific drawbacks. Here we merge both types into a hybrid photodetector device by integrating a colloidal quantum dot photodiode atop a graphene phototransistor. Our hybrid detector overcomes the limitations of a phototransistor in terms of speed, quantum efficiency and linear dynamic range. We report quantum efficiencies in excess of 70%, gain of 10 5 and linear dynamic range of 110 dB and 3 dB bandwidth of 1.5 kHz. This constitutes a demonstration of an optoelectronically active device integrated directly atop graphene and paves the way towards a generation of flexible highly performing hybrid two-dimensional (2D)/0D optoelectronics. The combination of fast photo-response and high gain plays a pivotal role in photodetector devices. Here the authors combine a colloidal quantum dot photodiode with a graphene phototransistor to overcome the speed, quantum efficiency and linear dynamic range limitations of available phototransistors.
doi_str_mv 10.1038/ncomms11954
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subjects 639/301/1005/1007
639/766/25
639/925
Bandwidths
Electrodes
Electrons
Graphene
Humanities and Social Sciences
multidisciplinary
Quantum dots
Science
Science (multidisciplinary)
Sensors
title Integrating an electrically active colloidal quantum dot photodiode with a graphene phototransistor
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