Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/19467
Title: Ultrasensitive organic phototransistors with multispectral response based on thin-film/single-crystal bilayer structures
Author: Pinto, R. M.
Gouveia, W.
Neves, A. I. S.
Alves, H.
Keywords: FIELD-EFFECT TRANSISTORS
N-TYPE
QUANTUM EFFICIENCY
PHOTODETECTORS
MOBILITY
HETEROSTRUCTURE
SEMICONDUCTORS
PHOTORESPONSE
INTERFACES
GROWTH
Issue Date: 2015
Publisher: AMER INST PHYSICS
Abstract: We report on highly efficient organic phototransistors (OPTs) based on thin-film/single-crystal planar bilayer junctions between 5,6,11,12-tetraphenyltetracene (rubrene) and [ 6,6]-phenyl-C-61-butyric acid methyl ester (PC61BM). The OPTs show good field-effect characteristics in the dark, with high hole-mobility (4-5cm(2) V-1 s(-1)), low-contact resistance (20 k Omega cm), and low-operating voltage (<= 5V). Excellent sensing capabilities allow for light detection in the 400-750 nm range, with photocurrent/dark current ratio as high as 4 x 10(4), responsivity on the order of 20AW(-1) at 27 mu Wcm(-2), and an external quantum efficiency of 52 000%. Photocurrent generation is attributed to enhanced electron and hole transfer at the interface between rubrene and PC61BM, and fast response times are observed as a consequence of the high-mobility of the interfaces. The optoelectronic properties exhibited in these OPTs outperform those typically provided by a-Si based devices, enabling future applications where multifunctionality in a single-device is sought. (C) 2015 AIP Publishing LLC.
Peer review: yes
URI: http://hdl.handle.net/10773/19467
DOI: 10.1063/1.4937005
ISSN: 0003-6951
Publisher Version: 10.1063/1.4937005
Appears in Collections:CICECO - Artigos



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