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Published Online: 02 December 2015
Accepted: November 2015

Ultrasensitive organic phototransistors with multispectral response based on thin-film/single-crystal bilayer structures

Appl. Phys. Lett. 107, 223301 (2015); https://doi.org/10.1063/1.4937005
R. M. Pinto1,2, a), W. Gouveia1, A. I. S. Neves1,3, and H. Alves1,4
more...View Affiliations
  • Original article: APL: Organic Electronics and Photonics 8 (12), 109_1 (2015)
    • 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-C61-butyric acid methyl ester (PC61BM). The OPTs show good field-effect characteristics in the dark, with high hole-mobility (4–5 cm2 V−1 s−1), low-contact resistance (20 kΩ cm), and low-operating voltage (≤5 V). Excellent sensing capabilities allow for light detection in the 400–750 nm range, with photocurrent/dark current ratio as high as 4 × 104, responsivity on the order of 20 AW−1 at 27 μW cm−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.
    The authors acknowledge the financial support from Fundação para a Ciência e Tecnologia (FCT) through Contract Nos. SFRH/BPD/84820/2012, IF/01088/2014, and funding through the IN and CICECO Associated Laboratories. A.N. thanks EPSRC for grant EP/M001024/1. The authors thank A. Kholkin (CICECO) for characterizing the PCBM films.

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