Effect of polymer matrices on hopping charge transport in molecularly doped polymers

We have studied the effect of polymer matrices on time‐of‐flight (TOF) photocurrent pulse shape and the drift mobility of holes in polymers doped with 2‐(p‐dipropylaminophenyl)‐4‐(p‐dimethylaminophenyl)‐5‐(o‐chlorophenyl)‐1, 3‐oxazole in order to understand the nature of hopping charge transport in molecularly doped polymers (MDPs). The TOF pulse shapes in oxazole‐doped polymers are classed into two groups: near rectangular or dispersive shapes. The drift mobility of holes in MDPs exhibiting near‐rectangular TOF shape is large compared with that exhibiting dispersive. Moreover, the drift mobility of holes depends on the dielectric constant and the glass transition temperature of polymers. These results show that the polarization and phonon mode of polymers play an important role in hopping charge transport in MDPs.

[1]  D. Imanishi,et al.  Effect of polymer matrix on a reversible light‐induced change in charge acceptance and retention of molecularly doped polymers , 1989 .

[2]  L. Schein,et al.  The electric field dependence of the mobility in molecularly doped polymers , 1989 .

[3]  T. Ikeda,et al.  Effect of polymer matrices on hole transport of 1,2‐trans‐bis(9H‐carbazole‐9‐yl) cyclobutane dissolved in a polymer binder , 1989 .

[4]  M. Štolka,et al.  The origin of dispersion of transiting charge carriers in molecular l y doped polymers , 1988 .

[5]  L. Schein,et al.  Hole transport in a molecularly doped polymer: p-diethylaminobenzaldehyde-diphenyl hydrazone in polycarbonate , 1986 .

[6]  M. Štolka,et al.  Redox migration mechanism of charge transport in molecularly doped polymers , 1986 .

[7]  J. Hirsch,et al.  Hole transport in isopropyl carbazole-polycarbonate mixtures , 1986 .

[8]  Damodar M. Pai,et al.  Hole transport in solid solutions of a diamine in polycarbonate , 1984 .

[9]  H. Bässler.  Charge transport in molecularly doped polymers , 1984 .

[10]  Dale S. Renfer,et al.  Hole transport in solid solutions of substituted triarylmethanes in bisphenol-A-polycarbonate , 1983 .

[11]  G. Pfister,et al.  Electronic properties of polymers , 1982 .

[12]  C. Duke,et al.  Electron transfer in pendant-group and molecularly doped polymers , 1981 .

[13]  G. Pfister.  Hopping transport in a molecularly doped organic polymer , 1977 .

[14]  Y. Shen,et al.  Study of photoluminescence in Cu/sub 2/O , 1975 .

[15]  E. Montroll,et al.  Anomalous transit-time dispersion in amorphous solids , 1975 .

[16]  W. D. Gill.  Drift mobilities in amorphous charge‐transfer complexes of trinitrofluorenone and poly‐n‐vinylcarbazole , 1972 .