α-Quaterthiophene–polyethylene blends: Phase behaviour and electronic properties

Organic Semiconductor:Insulator Polymer Ternary Blends for Photovoltaics

“…Finally, it is noteworthy that, similar to observations made in fabrication of FETs with poly(3‐alkylthiopene)s and insulating polymers,25–27, 29 it appeared beneficial to use a semicrystalline insulator as matrix for the active materials. Indeed, whereas OPV devices prepared with films comprising e.g., 20–40 wt% of semicrystalline, i ‐PS displayed J sc comparable to those of devices containing no insulator, those based on P3HT:PC 61 BM and amorphous, a ‐PS featured a significant reduction in J sc already at concentrations as low as 20 wt% a ‐PS ( Figure ).…”

“…In the case of organic semiconductors, addition of an insulating component might be expected to degrade electronic properties by reducing electronic contact between molecules and, consequently, this option has largely been neglected. Recently, however, the addition of an inert polymer has been shown to be of benefit for the fabrication of low‐percolation threshold field‐effect transistor (FET) devices of organic semiconducting small molecules, oligomers and polymers 25–31. Some of that work reveals that the addition of an inert component appears to have a less detrimental effect on the electronic properties of conjugated polymers31 than on those of small molecules 27…”

“…In order to first establish whether acceptable electronic properties can be achieved in ternary blends of PC 61 BM and P3HT, in a first set of experiments, OPV devices were prepared with active layers made from (P3HT:PC 61 BM 1:1):HDPE blend films, with a HDPE content of 40 wt%. For that purpose, previously established procedures25–27 were adopted to produce active films of thicknesses up to ≈300 nm. As with devices based on P3HT:PC 61 BM binary active layers, devices had to be thermally annealed to yield reasonable photocurrents.…”

Semiconducting Organic Molecular Materials

“…Well known defined are oligothiophenes, Fig. 3 (6) for n = 0 , 1, 2, 3, 4, 5, 6 [15]. The interest in this class of materials has increased since the first organic transistor, build with sexithienyl ( Fig.…”

Morphology, structure, and photovoltaic properties of poly(3‐hexylthiophene) and [6,6]‐phenyl‐C61‐butyric acid methyl ester‐based ternary blends doping with polystyrene of different tacticities

“…The addition of an insulating polymer dilutes the concentration of donor and acceptor components to reduce the absorbance of an active layer and may disrupt the continuous pathways of donor and acceptor phase, thereby stopping the transport of charges to the electrodes of a solar cell. Recently, addition of an inert polymer has demonstrated to facilitate the fabrication of low‐percolation threshold field‐effect transistor (FET) devices of organic semiconducting small molecules, oligomers, and polymers . It is revealed that the addition of an inert component appears to have a less detrimental effect on the electronic properties of conjugated polymers than on those of small molecules .…”