Charge carrier photogeneration and recombination in ladder-type poly(para-phenylene):: Interplay between impurities and external electric field

被引:22
作者
Gulbinas, V. [1 ]
Hertel, D. [2 ]
Yartsev, A. [3 ]
Sundstrom, V. [3 ]
机构
[1] Inst Phys, LT-02300 Vilnius, Lithuania
[2] Univ Cologne, Inst Phys Chem, D-50939 Cologne, Germany
[3] Lund Univ, S-22100 Lund, Sweden
关键词
D O I
10.1103/PhysRevB.76.235203
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Charge carrier generation and decay in m-LPPP polymer films were examined by means of femtosecond transient absorption spectroscopy in the time window of 100 fs-15 ns. Two modes of polaron formation with distinct behavior were identified, impurity induced in the absence of an external electric field and electric field induced in pristine film. While field induced charge generation is relatively slow, occurring throughout the excited state lifetime, the rate of impurity induced charge generation is much faster and depends on excitation wavelength; it occurs on the several hundred femtosecond time scale under excitation within the main absorption band, but excitation into the red wing of the absorption band results in charge generation within less than 100 fs. Polaron decay through geminate electron-hole recombination occurs with widely distributed lifetimes, from similar to 0.8 ns to microseconds; the polarons characterized by the shortest decay time have a redshifted absorption spectrum (as compared to more long-lived polarons) and are attributed to tightly bound polaron pairs.
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页数:7
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