Charged photoexcitations in thiophene-based molecular semiconductors

被引：11

作者：

Rossi, L

Lanzani, G

Garnier, F

机构：

[1] Univ Pavia, Dipartimento Fis A Volta, I-27100 Pavia, Italy

[2] Univ Sassari, Ist Matemat & Fis, I-07100 Sassari, Italy

[3] CNRS, Mat Mol Lab, F-94320 Thiais, France

[4] Ist Nazl Fis Mat, Milan, Italy

来源：

PHYSICAL REVIEW B | 1998年 / 58卷 / 11期

关键词：

D O I：

10.1103/PhysRevB.58.6684

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We applied the steady-state photomodulation spectroscopy to vacuum-deposited films of thiophene oligomers with controlled mesoscopic organization in order to understand the relation between structural order and charge photogeneration. We studied alpha,omega-dihexylsexithiophene films, which are highly ordered, and beta,beta'-dihexylsexithiophene films, which are amorphous. We observed pairlike excitations in the former (bipolarons and pi-dimers), triplets and polarons in the latter. To explain the results we propose a topological dependent charge separation model in which both dimensionality and carrier mobility play a role.

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页码：6684 / 6687

页数：4

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