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Abstract
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Poly (3-alkylthiophenes) (P3ATs) particularly poly (3-hexylthiophene) (P3HT) have vigorous tendency to
crystallize into the ordered morphologies, thereby reflect the efficient electrical and optical characteristics. Here,
the remarkable crystalline structures of P3ATs comprising single crystals, nanofibers, nano/microwires, nanoribbons, micelles, nanowhiskers, thinfilms, spherulites, etc. are thoroughly reviewed. In each category, the
principle aspects like preparation methodologies (e.g., self-seeding, shearing, electrospinning, self-organization,
epitaxial solidification, etc.), micro/nanostructures, orientation and optical properties are meticulously brought
into consideration. Applications of the ordered P3AT structures in solar cells, organicfield-effect transistors, and
sensors as well as the theoretical studies are also highlighted. Furthermore, the polymorphism, sol-gel, nanoparticles, liquid crystalline morphology, and two-dimensional sheets are reviewed.
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