New donor-acceptor alternating conjugated polymers were synthesized and characterized. Among them, PCPBBT exhibited a band-gap of 1.01 eV and ambipolar characteristics with μ(h) = 7.1 × 10(-4) cm(2) V(-1) s(-1) and μ(e) = 3.3 × 10(-3) cm(2) V(-1) s(-1).
18 A series of narrow bandgap donor-acceptor (D-A) type π-conjugated polymers consisting of 19 thiophene (Th)-or furan (Fu)-flanked diketopyrrolopyrroles (DPPs) as acceptor units and 20 thieno[3,2-b]thiophene (TT) or didodecyloxybenzo[1,2-b;3,4-b]dithiophene (BDT) moieties as 21 donor units were synthesized. Cyclic voltammetry and UV-vis absorption studies revealed that 22 both the heteroatom substitution in the aromatic end-groups of DPPs and variations in the 23 chemical backbone influenced the bandgap of these polymers. The TT-based polymers showed a 24 better thermal stability than their BDT analogues. P(ThDPP-TT) with better backbone planarity 25 among the polymers being studied was found to organize in edge-on fashion on silicon/silicon 26 dioxide surface, while all others showed a mixed type of both face-and edge-on arrangements. A 27 substantial reduction in the thin film order and packing of the polymer chains was observed as 28 the terminal thiophene units of DPP were replaced with furan. However, the furyl substituted 29 polymer exhibited relatively high charge carrier mobility possibly due to improved conduction 30 along the polymer backbone. The charge carrier transport properties of these polymers in organic 31 M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 2 field effect transistors (OFETs) were found to be influenced by incorporated donor units. 1Polymers with BDT-donor group exhibited unipolar hole transport, while those with TT units 2 were ambipolar in nature. The present study demonstrates a systematic investigation of the 3 structure-property relationships of D-A type DPP based π-conjugated copolymers which may 4 enlighten better design strategy of polymers with novel chemical structures in the future. 5Keywords: diketopyrrolopyrole; heteroatom substitution; organic field effect transistors; thin 6 film morphology; charge carrier mobility; ambipolar polymer. 7 8 9
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