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 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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Nikitskiy I,Goossens S,Kufer D,Lasanta T,Navickaite G,Koppens FH,Konstantatos Gdoi
10.1038/ncomms11954subject
Has Abstractpub_date
2016-06-17 00:00:00pages
11954issn
2041-1723pii
ncomms11954journal_volume
7pub_type
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