Comprehensive picture of p-type doping of P3HT with the molecular acceptor F(4)TCNQ
- 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
| Author details: | P. Pingel, Dieter NeherORCiDGND |
|---|---|
| DOI: | https://doi.org/10.1103/PhysRevB.87.115209 |
| ISSN: | 1098-0121 |
| Title of parent work (English): | Physical review : B, Condensed matter and materials physics |
| Publisher: | American Physical Society |
| Place of publishing: | College Park |
| Publication type: | Article |
| Language: | English |
| Year of first publication: | 2013 |
| Publication year: | 2013 |
| Release date: | 2017/03/26 |
| Volume: | 87 |
| Issue: | 11 |
| Number of pages: | 9 |
| Funding institution: | German Ministry of Education and Research [NeMO FKZ 13N10622, PVcomB FKZ 03IS2151D] |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| Peer review: | Referiert |
