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
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
Kim Bini
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
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
Sandro F. Tedde
Siemens
ACS Applied Materials & Interfaces
1944-8244 (ISSN) 1944-8252 (eISSN)
Vol. 10 15 12937-12946Subject Categories
Chemical Engineering
DOI
10.1021/acsami.8b03824