Charge Separation in Semicrystalline Polymeric Semiconductors by Photoexcitation: Is the Mechanism Intrinsic or Extrinsic?

被引：123

作者：

Paquin, Francis ^{[1
]}

Latini, Gianluca ^{[2
,3
]}

Sakowicz, Maciej ^{[1
]}

Karsenti, Paul-Ludovic ^{[1
]}

Wang, Linjun ^{[4
]}

Beljonne, David ^{[4
]}

Stingelin, Natalie ^{[2
,3
]}

Silva, Carlos ^{[1
]}

机构：

[1] Univ Montreal, Dept Phys & Regroupement Quebecois Mat Pointe, Montreal, PQ H3C 3J7, Canada

[2] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England

[3] Univ London Imperial Coll Sci Technol & Med, Ctr Plast Elect, London SW7 2AZ, England

[4] Univ Mons, B-7000 Mons, Belgium

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 19期

关键词：

GEMINATE PAIR RECOMBINATION; CONJUGATED POLYMERS; DELAYED FLUORESCENCE; DYNAMICS; EXCITONS; POLY(3-HEXYLTHIOPHENE); SPECTROSCOPY; EXCITATION; MIGRATION; TRANSPORT;

D O I：

10.1103/PhysRevLett.106.197401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We probe charge photogeneration and subsequent recombination dynamics in neat regioregular poly(3-hexylthiophene) films over six decades in time by means of time-resolved photoluminescence spectroscopy. Exciton dissociation at 10 K occurs extrinsically at interfaces between molecularly ordered and disordered domains. Polaron pairs thus produced recombine by tunneling with distributed rates governed by the distribution of electron-hole radii. Quantum-chemical calculations suggest that hot-exciton dissociation at such interfaces results from a high charge-transfer character.

引用

页数：4

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