Bandlike transport in pentacene and functionalized pentacene thin films revealed by subpicosecond transient photoconductivity measurements

被引：132

作者：

Ostroverkhova, O ^{[1
]}

Cooke, DG

Shcherbyna, S

Egerton, RF

Hegmann, FA

Tykwinski, RR

Anthony, JE

机构：

[1] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada

[2] Univ Alberta, Dept Chem, Edmonton, AB T6G 2G2, Canada

[3] Univ Kentucky, Dept Chem, Lexington, KY 40506 USA

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.71.035204

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We observe bandlike transport in pentacene and functionalized pentacene thin films using time-resolved terahertz pulse spectroscopy. The measured transient photoconductivity exhibits fast (<400 fs) photogeneration of mobile charge carriers and reveals a transient carrier mobility that increases as the temperature decreases from 300 K down to 10 K, indicative of bandlike transport over subpicosecond time scales. A wavelength-independent photoconductive signal is observed. The transient photoconductivity in the thin-film samples exhibits a single-exponential decay, whereas a power-law decay is seen in single-crystal samples.

引用

页数：6

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