Direct Observation of Sub-100 fs Mobile Charge Generation in a Polymer-Fullerene Film

被引：88
|
作者：
Cooke, D. G. [1 ]
Krebs, F. C. [2 ]
Jepsen, P. U. [3 ]
机构：
[1] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
[2] Tech Univ Denmark, Dept Energy Convers & Storage, DK-4000 Roskilde, Denmark
[3] Tech Univ Denmark, Dept Photon Engn, DK-2800 Lyngby, Denmark
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 05期
基金：
加拿大自然科学与工程研究理事会;
关键词：
CARRIER DYNAMICS; AC CONDUCTION; TERAHERTZ; PHOTOGENERATION; POLYTHIOPHENE; SPECTROSCOPY; PULSES;
D O I：
10.1103/PhysRevLett.108.056603
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The formation of mobile charges in a roll-to-roll processed poly-3-hexylthiophene-fullerene bulk heterojunction film is observed directly by using transient terahertz spectroscopy with sub-100 fs temporal resolution. The transient terahertz ac conductivity reveals that 20% of the incident pump photons are converted into highly delocalized charges within the 40 fs, 3.1 eV pump pulse duration, which then rapidly becomes localized within 120 fs. Approximately 2/3 of these carriers subsequently decay, possibly into an exciton, on a 1 ps time scale.
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页数：5
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