Comprehensive picture of p-type doping of P3HT with the molecular acceptor F4TCNQ

被引：314

作者：

Pingel, P. ^{[1
]}

Neher, D. ^{[1
]}

机构：

[1] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 11期

关键词：

DENSITY-OF-STATES; CHARGE-TRANSFER; ORGANIC SEMICONDUCTORS; ELECTRONIC-STRUCTURE; KELVIN PROBE; POLYMERS; TRANSPORT; LAYERS; TETRAFLUOROTETRACYANOQUINODIMETHANE; GENERATION;

D O I：

10.1103/PhysRevB.87.115209

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

By means of optical spectroscopy, Kelvin probe, and conductivity measurements, we study the p-type doping of the donor polymer poly(3-hexylthiophene), P3HT, with the molecular acceptor tetrafluorotetracyanoquin-odimethane, F(4)TCNQ, covering a broad range of molar doping ratios from the ppm to the percent regime. Thorough quantitative analysis of the specific near-infrared absorption bands of ionized F(4)TCNQ reveals that almost every F(4)TCNQ dopant undergoes integer charge transfer with a P3HT site. However, only about 5% of these charge carrier pairs are found to dissociate and contribute a free hole for electrical conduction. The nonlinear behavior of the conductivity on doping ratio is rationalized by a numerical mobility model that accounts for the broadening of the energetic distribution of transport sites by the Coulomb potentials of ionized F(4)TCNQ dopants. DOI: 10.1103/PhysRevB.87.115209

引用

页数：9

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