High-Performance Organic Photodetectors from a High-Bandgap Indacenodithiophene-Based π-Conjugated Donor-Acceptor Polymer
Journal article, 2018

A conjugated donor-acceptor polymer, poly[4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl-alt-5-(2-ethylhexyl)-4H-thieno[3,4-c] pyrrole-4,6(5H)-dione-1,3-diyl] (PIDT-TPD), is blended with the fullerene derivative [6,6] phenyl-C61-butyric acid methyl ester (PC 61 BM) for the fabrication of thin and solution-processed organic photodetectors (OPDs). Systematic screening of the concentration ratio of the blend and the molecular weight of the polymer is performed to optimize the active layer morphology and the OPD performance. The device comprising a medium molecular weight polymer (27.0 kg/mol) in a PIDT-TPD:PC 61 BM 1:1 ratio exhibits an external quantum efficiency of 52% at 610 nm, a dark current density of 1 nA/cm 2 , a detectivity of 1.44 × 10 13 Jones, and a maximum 3 dB cutoff frequency of 100 kHz at -5 V bias. These results are remarkable among the state-of-the-art red photodetectors based on conjugated polymers. As such, this work presents a functional organic active material for high-speed OPDs with a linear photoresponse at different light intensities.

high speed

frequency response

concentration ratio

red organic photodetectors

dark current density

molecular weight

Author

Cindy Montenegro Benavides

Siemens

University of Erlangen-Nuremberg (FAU)

Petri Henrik Murto

Flinders University

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Christos L. Chochos

University of Ioannina

Advent Technologies SA

Vasilis G. Gregoriou

Advent Technologies SA

Apostolos Avgeropoulos

University of Ioannina

Xiaofeng Xu

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Kim Bini

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Mats Andersson

Flinders University

A. Sharma

Flinders University

University of Bordeaux

Oliver Schmidt

Siemens

Christoph J. Brabec

University of Erlangen-Nuremberg (FAU)

Ergang Wang

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Ergang Wang Group

Sandro F. Tedde

Siemens

ACS Applied Materials & Interfaces

1944-8244 (ISSN) 1944-8252 (eISSN)

Vol. 10 15 12937-12946

Subject Categories

Chemical Engineering

DOI

10.1021/acsami.8b03824

More information

Latest update

6/19/2018