Five novel donor-acceptor （D-A） conjugated cooligomers （F4B-hP, F5B-hP, F5B2[1,2]-hP, F5B2[I,3]-hP and F7B2[1,2]-hP） were synthesized. The absorption spectra of the cooligomers cover a wide range from 300 nm to 630 nm. The cooligomers could form films featured by alternating D-A lamellar nanostructures with the periods relative to the molecular lengths after thermal annealing or solvent vapor annealing. Single molecule solar cells were fabricated, and FSB-hP exhibited the best device performance. When the film of FSB-hP was thermally annealed, a power conversion efficiency （PCE） of 1.56% was realized. With solvent vapor annealing, the PCE could be further improved to 1.72% with a short-circuit current （J_SC） of 5.76 mA/cm2, an open-circuit voltage （Voc） of 0.87 V and a fill factor （FF） of 0.34.
High-mobility vanadyl phthalocyanine(VOPc)/5,5"'−bis(4-fluorophenyl)-2,2':5',2":5",2"'−quaterthiophene(F2-P4T)thin-film transistors are demonstrated by employing a copper hexadecafluorophthalocyanine(F16CuPc)/copper phthalocyanine(CuPc)heterojunction unit,which are fabricated at different substrate temperatures,as a buffer layer.The highest mobility of 4.08 cm^(2)/Vs is achieved using a F16CuPc/CuPc organic heterojunction buffer layer fabricated at high substrate temperature.Compared with the random small grain-like morphology of the room-temperature buffer layer,the high-temperature organic heterojunction presents a large-sized fiber-like film morphology,resulting in an enhanced conductivity.Thus the contact resistance of the transistor is significantly reduced and an obvious improvement in device mobility is obtained.
PAN FengQIAN Xian-RuiHUANG Li-ZhenWANG Hai-BoYAN Dong-Hang
