TY  - JOUR
A1  - Pingel, P.
A1  - Neher, Dieter
T1  - Comprehensive picture of p-type doping of P3HT with the molecular acceptor F(4)TCNQ
JF  - Physical review : B, Condensed matter and materials physics
N2  - 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
Y1  - 2013
U6  - https://doi.org/10.1103/PhysRevB.87.115209
SN  - 1098-0121
VL  - 87
IS  - 11
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Pingel, P.
A1  - Schwarzl, R.
A1  - Neher, Dieter
T1  - Effect of molecular p-doping on hole density and mobility in poly(3-hexylthiophene)
JF  - Applied physics letters
N2  - Employing impedance spectroscopy, we have studied the hole density, conductivity, and mobility of poly(3-hexylthiophene), P3HT, doped with the strong molecular acceptor tetrafluorotetracyanoquinodimethane, F(4)TCNQ. We find that the hole density increases linearly with the F(4)TCNQ concentration. Furthermore, the hole mobility is decreased upon doping at low-to-medium doping level, which is rationalized by an analytic model of carrier mobility in doped organic semiconductors [V. I. Arkhipov, E. V. Emelianova, P. Heremans, and H. Bassler, Phys. Rev. B 72, 235202 (2005)]. We infer that the presence of ionized F(4)TCNQ molecules in the P3HT layer increases energetic disorder, which diminishes the carrier mobility.
Y1  - 2012
U6  - https://doi.org/10.1063/1.3701729
SN  - 0003-6951
VL  - 100
IS  - 14
PB  - American Institute of Physics
CY  - Melville
ER  -