Copolymers hole mobility

Fig. 8 Temperature dependence of the zero field hole mobility in the low carrier density limit in a polyfluorene copolymer. The data are inferred from space-charge-limited current experiments and analyzed in terms of the extended Gaussian disorder model (see Sect. 4.1). From [90] with permission. Copyright (2008) by the American Institute of Physics...

Khan RUA, Poplavskyy D, Kreouzis T, Bradley DDC (2007) Hole mobility within arylamine-containing polyfluorene copolymers a time-of-flight transient-photocurrent study. Phys Rev B 75 035215... 

In a FET device with highly doped Si as the gate and Si02 as the gate insulator, the hole mobility of the alternating copolymer 20 was measured.37... 

The hole mobility of the copolymer is 1 X 10-3 cm2/V s, which well supports its outstanding photovoltaic performance. 

Dithienosilole-thiophene copolymers 21 (Fig. 10) can show excellent FET performances.38 With the copolymers as the active layer, remarkably high hole mobility from 0.02 to 0.06 cm2/(V s) can be achieved. Furthermore, the FET devices possess high current on/off ratios of 105—106. The FET devices also display impressive stabilities under repeated on/off cycles up to 2000 in air. 

Borsenberger et al. (1993) measured hole mobilities of TAPC doped into a series of styrene (S) butylacrylate (BA) copolymers with different dipole moments. The dipole moments of the S and BA monomers are 0.40 and 1.52 Debye. By varying the S BA ratio from 100 0 to 50 50, the copolymer dipole moment can be varied from 0.40 to 0.96 Debye. Figure 35 shows the room temperature field dependencies for different S BA ratios. The mobilities vary by nearly two orders of magnitude, increasing with decreasing copolymer dipole moment. In all cases, the field dependencies were described as logp,... 

Figure 35 The field dependencies of the hole mobilities of TAPC doped into a series of S BA copolymers.

Andersson LM, Inganas O (2006) Acceptor influence on hole mobility in fullerene blends with alternating copolymers of fluorene. Appl Phys Lett 88 082103... 

Jenekhe et al. have synthesized a processable copolymer 214 of thiophene and phenoxazine [389], which presents a hole mobility of 6 x 10 cm s PT derivatives incorporating fluorinated phenylene units in the main chain such as 215 have been investigated by Skabara and coworkers [390]. Although hole mobility (2 x 10 cm s for 215) requires further improvement, they have shown that copolymers containing the tetrafluorophenyl unit are superior to the unsubstituted or difluorophenylene analogs. 

Wang, R, J. Luo, K. Yang, J. Chen, R Huang, and Y. Cao. 2005. Conjugated fluorene and sUole copolymers Synthesis, characterization, electronic transistion, light emission, photovoltaic cell, and field effect hole mobility. Macromolecules 38 2253-2260. 

Although polythiophenes are best utilized as solution-processable high-performance p-type semiconductors [102], polyselenophenes are of no use as FET materials because of their insolubility. However, it was recently reported that selenophene-containing copolymers 47-50 could form thin films with a solution-processable method and showed p-channel FET responses with hole mobilities of the order of 10 " -10 cm V s [103]. When the thin films were annealed after spin coating, the mobilities were enhanced by one order of magnitude. 

Ha JS, Kim KH, Choi DH (2011) 2,5-Bis(2-octyldodecyl)pyrrolo[3,4-c]pynole-l,4-(2H,5H)-dione-based donor-acceptor alternating copolymer bearing 5,5 -di(thiophen-2-yl)-2,2 -biselenophene exhibiting 1.5 cm s hole mobility in thin-film transistors. J Am Chem Soc 133 10364-10367... 

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