Ultrafast charge carrier mobility dynamics in poly(spirobifluorene-co-benzothiadiazole): Influence of temperature on initial transport

被引：28

作者：

Devizis, A. ^{[1
]}

Meerholz, K. ^{[2
]}

Hertel, D. ^{[2
]}

Gulbinas, V. ^{[1
]}

机构：

[1] Ctr Phys Sci & Technol, Vilnius, Lithuania

[2] Univ Cologne, Dept Chem, D-50939 Cologne, Germany

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 15期

关键词：

2ND-HARMONIC GENERATION; TRANSIENT PHOTOCONDUCTIVITY; CONJUGATED POLYMERS; ELECTRIC-FIELDS; POLY(P-PHENYLENEVINYLENE); TRANSISTORS; RELAXATION; DEPENDENCE; PROBE; FILMS;

D O I：

10.1103/PhysRevB.82.155204

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work we examine the influence of temperature on the transport dynamics of photogenerated charge carriers in pi-conjugated poly(spirobifluorene-co-benzothiadiazol) films. Investigations were performed by picosecond time-resolved electric field induced second-harmonic technique. The mobility is independent of temperature during the initial 100 ps. During this time, the carriers drift about 6 nm under an applied field of 1.2 x 10(6) V/cm, and the mobility decreases from 3 x 10(-2) cm(2)/V s by one order of magnitude. We attribute this change in mobility to the intrachain charge transport during carrier relaxation down in the density of states. At a time delay of 1 ns the transport is temperature dependent with an activation energy of about 22 meV.

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页数：8

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