PMID- 16821847
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20070727
LR  - 20060706
IS  - 1520-6106 (Print)
IS  - 1520-5207 (Linking)
VI  - 110
IP  - 27
DP  - 2006 Jul 13
TI  - Molecular weight dependent charge carrier mobility in poly(3,3' 
      '-dioctyl-2,2':5',2' '-terthiophene).
PG  - 13305-9
AB  - Poly(3,3' '-dioctyl-2,2':5',2' '-terthiophene), a polymer recently used for the 
      fabrication of organic field effect transistors, has been fractionated into five 
      fractions distinctly differing in their molecular weights (Mn), with the goal of 
      determining the influence of the degree of polymerization (DPn) on its principal 
      physicochemical parameters. It has been demonstrated that within the Mn range 
      studied (from 1.5 kDa to 10.5 kDa by SEC), corresponding to DPn from 10 to 38, 
      the polymer band gap steadily decreases with growing molecular weight, which is 
      clearly manifested by an increasing bathochromic shift of the band originating 
      from the pi-pi* transition. The same trend is observed for the HOMO level, 
      determined from the onset of the p-doping in cyclic voltammetry, which shifts 
      from -5.10 eV to -4.90 eV for the lowest and the highest molecular weight 
      fractions, respectively. The most pronounced influence of DPn has been found for 
      the charge carriers' mobility-one of the most important parameters of field 
      effect transistors (FETs) fabricated from this polymer. A fourfold increase in 
      DPn results in an increase of the carriers' mobility by more than 3 orders of 
      magnitude. Comparison of these results with those obtained for fractionated 
      regioregular poly(3-hexylthiophene) shows a strikingly similar behavior of both 
      polymers with respect to the molecular weight.
FAU - Verilhac, Jean-Marie
AU  - Verilhac JM
FAU - Pokrop, Rafal
AU  - Pokrop R
FAU - LeBlevennec, Gilles
AU  - LeBlevennec G
FAU - Kulszewicz-Bajer, Irena
AU  - Kulszewicz-Bajer I
FAU - Buga, Katarzyna
AU  - Buga K
FAU - Zagorska, Malgorzata
AU  - Zagorska M
FAU - Sadki, Said
AU  - Sadki S
FAU - Pron, Adam
AU  - Pron A
LA  - eng
PT  - Letter
PL  - United States
TA  - J Phys Chem B
JT  - The journal of physical chemistry. B
JID - 101157530
EDAT- 2006/07/11 09:00
MHDA- 2006/07/11 09:01
CRDT- 2006/07/11 09:00
PHST- 2006/07/11 09:00 [pubmed]
PHST- 2006/07/11 09:01 [medline]
PHST- 2006/07/11 09:00 [entrez]
AID - 10.1021/jp0624956 [doi]
PST - ppublish
SO  - J Phys Chem B. 2006 Jul 13;110(27):13305-9. doi: 10.1021/jp0624956.