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π-Extension of tetrathiafulvalene by hybridization with an indacenetetraone leads to an electron acceptor that can harvest visible light efficiently and serve as an electron-transport material for poly(3-hexylthiophene)-based bulk-heterojunction photovoltaics, where brief thermal annealing of the active layer results in better carrier transport pathways to enhance the device performance. [ABSTRACT FROM AUTHOR]

The impacts of solvent and thermal annealing on the mobility and photogeneration efficiency of free charge carriers in regioregular poly(3-hexylthiophene) were investigated by flashphotolysis time-resolved microwave conductivity measurements, transient absorption spectroscopy of the perylenediimide radical anion, and photocurrent measurements of a comb-type interdigitated electrode. A respectable high mobility of 0.62 cm²V-1 s-1 was found as a three-dimensional value, highlighting the unprecedented electronic nature of the conjugated polymer. [ABSTRACT FROM AUTHOR]

The charge carrier photo generation in fullerene (C60) doped polysilane (PS) is a multistage process including, photo induced electron transfer between polysilane to 3C*60and relaxation of the charge-transfer state which results in polaron pair (PS·+ and C·– 60) formation. To study the mobility of charge carriers in polysilane films (PS1-8) doped with fullerene (C60), the flash photolysis time-resolved microwave conductivity (FP-TRMC) measurements have been performed. Second harmonic generation (SHG), laser of wavelength 532 nm has been used as excitation source. The highest ϕ∑μ value (7×10−5 cm2/Vs) obtained for PS6 among all polysilanes due to its highly ordered structure. The photo carrier generation efficiency of polysilane films have increased due to fullerene doping. The fast decay kinetics of TRMC signal is due to backward electron transfer between PS·– and C·–where as slow decay can be attributed to charge recombination after diffusion process. [Copyright &y& Elsevier]