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

Ivan Nikitskiy, Stijn Goossens, Dominik Kufer, Tania Lasanta, Gabriele Navickaite, Frank H. L. Koppens () and Gerasimos Konstantatos ()
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Ivan Nikitskiy: ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
Stijn Goossens: ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
Dominik Kufer: ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
Tania Lasanta: ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
Gabriele Navickaite: ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
Frank H. L. Koppens: ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
Gerasimos Konstantatos: ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract 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 105 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.

Date: 2016
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DOI: 10.1038/ncomms11954

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