Reduced Charge Transfer Exciton Recombination in Organic Semiconductor Heterojunctions by Molecular Doping

被引：83

作者：

Deschler, Felix ^{[1
,2
]}

Da Como, Enrico ^{[1
,2
]}

Limmer, Thomas ^{[1
,2
]}

Tautz, Raphael ^{[1
,2
]}

Godde, Tillmann ^{[3
]}

Bayer, Manfred ^{[3
]}

von Hauff, Elizabeth ^{[4
]}

Yilmaz, Seyfullah ^{[5
,6
]}

Allard, Sybille ^{[5
,6
]}

Scherf, Ullrich ^{[5
,6
]}

Feldmann, Jochen ^{[1
,2
]}

机构：

[1] Univ Munich, Photon & Optoelect Grp, Dept Phys, D-80799 Munich, Germany

[2] Univ Munich, CeNS, D-80799 Munich, Germany

[3] Tech Univ Dortmund, D-44227 Dortmund, Germany

[4] Carl von Ossietzky Univ Oldenburg, EHF, Inst Phys, D-26111 Oldenburg, Germany

[5] Wuppertal Univ, Dept Chem, D-42097 Wuppertal, Germany

[6] Wuppertal Univ, Inst Polymer Chem, D-42097 Wuppertal, Germany

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 12期

关键词：

CONJUGATED POLYMERS; TRANSPORT;

D O I：

10.1103/PhysRevLett.107.127402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the effect of molecular doping on the recombination of electrons and holes localized at conjugated-polymer-fullerene interfaces. We demonstrate that a low concentration of p-type dopant molecules (< 4% weight) reduces the interfacial recombination via charge transfer excitons and results in a favored formation of separated carriers. This is observed by the ultrafast quenching of photoluminescence from charge transfer excitons and the increase in photoinduced polaron density by similar to 70%. The results are consistent with a reduced formation of emissive charge transfer excitons, induced by state filling of tail states.

引用

页数：4

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