Details

Autor(en) / Beteiligte

• Scholes, D. Tyler
• Hawks, Steven A.
• Yee, Patrick Y.
• Wu, Hao
• Lindemuth, Jeffrey R.
• Tolbert, Sarah H.
• Schwartz, Benjamin J.

Titel

Overcoming Film Quality Issues for Conjugated Polymers Doped with F4TCNQ by Solution Sequential Processing: Hall Effect, Structural, and Optical Measurements

Ist Teil von

• The journal of physical chemistry letters, 2015-12, Vol.6 (23), p.4786-4793

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We demonstrate that solution-sequential processing (SqP) can yield heavily doped pristine-quality films when used to infiltrate the molecular dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) into pure poly­(3-hexylthiophene) (P3HT) polymer layers. Profilometry measurements show that the SqP method produces doped films with essentially the same surface roughness as pristine films, and 2-D grazing-incidence wide-angle X-ray scattering (GIWAXS) confirms that SqP preserves both the size and orientation of the pristine polymer’s crystallites. Unlike traditional blend-cast F4TCNQ/P3HT doped films, our sequentially processed layers have tunable and reproducible conductivities reaching as high as 5.5 S/cm even when measured over macroscopic (>1 cm) distances. The high conductivity and superb film quality allow for meaningful Hall effect measurements, which reveal p-type conduction and carrier concentrations tunable from 1016 to 1020 cm–3 and hole mobilities ranging from ∼0.003 to 0.02 cm2 V–1 s–1 at room temperature over the doping levels examined.