journal article·2018-04-18

High-Performance Organic Photodetectors from a High-Bandgap Indacenodithiophene-Based π-Conjugated Donor–Acceptor Polymer

Cindy Montenegro Benavides, Petri Murto, Christos L. Chochos, Vasilis G. Gregoriou, Apostolos Avgeropoulos, Xiaofeng Xu, Kim Bini, Anirudh Sharma, Mats R. Andersson, Oliver Schmidt, Christoph J. Brabec, Ergang Wang, Sandro F. Tedde

ACS Applied Materials & Interfaces· Volume 10· Issue 15
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Abstract

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 (PC61BM) 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:PC61BM 1:1 ratio exhibits an external quantum efficiency of 52% at 610 nm, a dark current density of 1 nA/cm2, a detectivity of 1.44 × 1013 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.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Nanowire Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Siemens Healthcare GmbH, Günther-Scharowsky-Street 1, 91058 Erlangen, Germany

Department für Material Science, i-MEET, Friedrich-Alexander Universität Erlangen-Nürnberg, Martensstr. 7, 91058 Erlangen, Germany

Department of Chemistry and Chemical Engineering/Applied Chemistry, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden

Flinders Centre for Nanoscale Science and Technology, Flinders University, Sturt Road, Bedford Park, Adelaide, South Australia 5042, Australia

Advent Technologies SA, Patras Science Park, Stadiou Street, Platani-Rio, 26504 Patra, Greece

Department of Materials Science Engineering, University of Ioannina, Ioannina 45110, Greece

Funding

Svenska Forskningsrådet Formas · Vetenskapsrådet · Materials Science Area of Advance, Chalmers Tekniska Högskola · Energy Area of Advance, Chalmers Tekniska Högskola

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