Highly Efficient Rubrene-Graphene Charge-Transfer Interfaces as Phototransistors in the Visible Regime

authors	Jones, GF; Pinto, RM; De Sanctis, A; Nagareddy, VK; Wright, CD; Alves, H; Craciun, MF; Russo, S
nationality	International
journal	ADVANCED MATERIALS
author keywords	graphene phototransistors; high quantum efficiency; organic single crystals; photodetectors; rubrene
keywords	ORGANIC SEMICONDUCTORS; SINGLE-CRYSTAL; QUANTUM DOTS; HIGH-GAIN; HYBRID; DEVICES; PHOTODETECTORS; PHOTORESPONSE; NOISE
abstract	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.
publisher	WILEY-V C H VERLAG GMBH
issn	0935-9648
year published	2017
volume	29
issue	41
digital object identifier (doi)	10.1002/adma.201702993
subject category	7
unique article identifier	WOS:000414349800012