Journal
ADVANCED MATERIALS
Volume 29, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201702993
Keywords
graphene phototransistors; high quantum efficiency; organic single crystals; photodetectors; rubrene
Categories
Funding
- EPSRC [464, EP/J000396/1, EP/K07160/1, EP/K010050/1, EP/G036101/1, EP/M001024/1, 465 EP/M002438/1]
- Royal Society international Exchanges Scheme [2012/R3, 466 2013/R2]
- European Commission [FP7-ICT-2013-613024-GRASP]
- Engineering and Physical Sciences Research Council [EP/K017160/1, EP/K010050/1, 1545105, EP/J000396/1, EP/M001024/1, EP/M002438/1, EP/G036101/1] Funding Source: researchfish
- EPSRC [EP/K017160/1, EP/M002438/1, EP/G036101/1, EP/M001024/1, EP/J000396/1, EP/K010050/1] Funding Source: UKRI
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Atomically thin materials such as graphene are uniquely responsive to charge transfer from adjacent materials, making them ideal charge-transport layers in phototransistor devices. Effective implementation of organic semiconductors as a photoactive layer would open up a multitude of applications in biomimetic circuitry and ultra-broadband imaging but polycrystalline and amorphous thin films have shown inferior performance compared to inorganic semiconductors. Here, the long-range order in rubrene single crystals is utilized to engineer organic-semiconductor-graphene phototransistors surpassing previously reported photogating efficiencies by one order of magnitude. Phototransistors based upon these interfaces are spectrally selective to visible wavelengths and, through photoconductive gain mechanisms, achieve responsivity as large as 10(7) A W-1 and a detectivity of 9 x 10(11) Jones at room temperature. These findings point toward implementing low-cost, flexible materials for amplified imaging at ultralow light levels.
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