TY - JOUR
T1 - High-Performance Organic Photodetectors from a High-Bandgap Indacenodithiophene-Based π-Conjugated Donor-Acceptor Polymer
AU - Benavides, Cindy Montenegro
AU - Murto, Petri
AU - Chochos, Christos L.
AU - Gregoriou, Vasilis G.
AU - Avgeropoulos, Apostolos
AU - Xu, Xiaofeng
AU - Bini, Kim
AU - Sharma, Anirudh
AU - Andersson, Mats R.
AU - Schmidt, Oliver
AU - Brabec, Christoph J.
AU - Wang, Ergang
AU - Tedde, Sandro F.
PY - 2018/4/18
Y1 - 2018/4/18
N2 - 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.
AB - 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.
KW - concentration ratio
KW - dark current density
KW - frequency response
KW - high speed
KW - molecular weight
KW - red organic photodetectors
UR - http://www.scopus.com/inward/record.url?scp=85045660770&partnerID=8YFLogxK
U2 - 10.1021/acsami.8b03824
DO - 10.1021/acsami.8b03824
M3 - Article
SN - 1944-8244
VL - 10
SP - 12937
EP - 12946
JO - ACS Applied Materials & Interfaces
JF - ACS Applied Materials & Interfaces
IS - 15
ER -