Polymer Field Effect Transistors of F8T2 Prepared by Evaporative Spray Deposition using Ultradilute Solution Technique

Effect of annealing on photovoltaic properties and microstructure of conventional and inverted organic solar cells using active bilayer based on liquid-crystal semiconducting polymer and fullerene

“…The photovoltaic properties have been influenced by molecular interaction and molecular ordering in crystalline microstructure after annealing in the range from glass transition temperature to liquid-crystal transition. Crystallographic analysis and morphological observation in phase separation confirmed molecular ordering of bithiophene-fluorene copolymer and fullerene varied with mole ratio of segment after annealing [11,12]. Control of morphological microstructure at crystal state in the organic solar cells is important for tuning in optimizing exciton diffusion, charge separation and electron (hole) transfer to cathode (anode).…”

“…The photovoltaic behavior at solid phase below the glass transition temperature would be generated by light-induced charge separation and charge transfer between C 60 and F8T2 in the active bilayer. As reference, the hole mobility of F8T2 was reported to be 2.3 × 10 À5 cm 2 V À1 s À1 , 1.7 × 10 À5 cm 2 V À1 s À1 and 1.4 × 10 À5 cm 2 V À1 s À1 with and without annealing at 150°C and 280°C [12]. The photovoltaic behavior at thermal condition near the glass transition and the liquid-crystal transition would be controlled by state of carrier hopping process in amorphous phase.…”

“…Additionally, semiconductive properties of the F8T2 film were characterized to be a low magnitude of hole mobility at 10 À4 cm 2 V À1 S À1 on the basis of experimental data [20]. As reference, the hole mobility of F8T2 was reported to be 2.3 × 10 À5 cm 2 V À1 s À1 , 1.7 × 10 À5 cm 2 V À1 s À1 and 1.4 × 10 À5 cm 2 V À1 s À1 with and without annealing at 150°C and 280°C [12]. The field-effect hole mobility showed a slight decrease tendency when the annealing temperature increases at 150°C and 280°C.…”

“…Bulk heterojunction organic solar cell based on organic semiconducting polymers using F8T2 and fullerene derivatives as p-type and n-type semiconductors has been studied for improving photovoltaic and optical properties [9,10]. Crystallographic analysis and morphological observation in phase separation confirmed molecular ordering of bithiophene-fluorene copolymer and fullerene varied with mole ratio of segment after annealing [11,12]. Crystallographic analysis and morphological observation in phase separation confirmed molecular ordering of bithiophene-fluorene copolymer and fullerene varied with mole ratio of segment after annealing [11,12].…”

Photovoltaic properties and morphology of organic solar cells based on liquid-crystal semiconducting polymer with additive

“…The photovoltaic properties were influenced by molecular interaction and molecular ordering in crystalline microstructure after annealing in the range from glass transition temperature to liquid crystal transition. Crystallographic analysis and morphological observation in phase separation confirmed molecular ordering of bithiophene-fluorene copolymer and fullerene after annealing [11,12]. Control of morphological microstructure in the organic solar cells is important for tuning in optimizing exciton diffusion, charge separation and electron (hole) transfer to cathode (anode).…”