High-Performance Organic Photodetectors from a High-Bandgap Indacenodithiophene-Based π-Conjugated Donor-Acceptor Polymer
Artikel i vetenskaplig tidskrift, 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
Författare
Cindy Montenegro Benavides
Siemens
Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)
Petri Henrik Murto
Flinders University
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Christos L. Chochos
University of Ioannina
Advent Technologies SA
Vasilis G. Gregoriou
Advent Technologies SA
Apostolos Avgeropoulos
University of Ioannina
Xiaofeng Xu
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Kim Bini
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Mats Andersson
Flinders University
A. Sharma
Flinders University
Université de Bordeaux
Oliver Schmidt
Siemens
Christoph J. Brabec
Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)
Ergang Wang
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Sandro F. Tedde
Siemens
ACS Applied Materials & Interfaces
1944-8244 (ISSN) 1944-8252 (eISSN)
Vol. 10 15 12937-12946Ämneskategorier
Kemiteknik
DOI
10.1021/acsami.8b03824