Poly(3-hexylthiophene) (P3HT) is a polymer with chemical formula (C10H14S)n. It is a polythiophene with a short alkyl group on each repeat unit. It is noteworthy since it is a seminconducting polymer; it can conduct positive charges (holes). It is a common material for studies of organic electronics (e.g. FETs) and for organic photovoltaics (OPV).
P3HT typically organizes into a semi-crystalline state, with an idealized unit cell as shown below:
- The lamellar stacking has a spacing of ~1.6 nm, giving rise to a peak (100) at q ~0.4 Å−1.
- The aromatic (π-π) stacking has a spacing of ~0.39 nm, giving rise to a peak (010) at q ~1.6 Å−1.
- The spacing along the ring direction is too disordered to give a well-defined 001 peak.
Refer to P3HT orientation for details about the organization of P3HT.
On flat substrates, P3HT typically organizes into an edge-on orientation, wherein the lamellar stacking direction is along the film normal (leading to the 100 peak being along qz), and the aromatic stacking then being in-plane (010 peak along qr).
- Density: ~1.33 g/cm3
- Neutron SLD: 0.817×10−6 Å−2
|Material||density (g/cm3)||X-ray energy (keV)||X-ray wavelength (Å)||critical angle (°)||qc (Å−1)||SLD (10−6Å−2)|
- Wikipedia: polythiophene
- Electron Diffraction and unit-cell: Martin Brinkmann, Christophe Contal, Navaphun Kayunkid, Tatjana Djuric, and Roland Resel Highly Oriented and Nanotextured Films of Regioregular Poly(3-hexylthiophene) Grown by Epitaxy on the Nanostructured Surface of an Aromatic Substrate Macromolecules 2010, 43(18), 7604-7610. doi: 10.1021/ma101313m
- Peter Müller-Buschbaum The Active Layer Morphology of Organic Solar Cells Probed with Grazing Incidence Scattering Techniques Advanced Materials 2014, 26 (46), 7692-7709. doi: 10.1002/adma.201304187