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Highly Ordered n/p-Co-assembled Materials with Remarkable Charge Mobilities

López-Andarias, Javier, Rodriguez, María José, Atienza, Carmen, López, Juan Luis, Mikie, Tsubasa, Casado, Santiago, Seki, Shu, Carrascosa, José L., Martín, Nazario
Journal of the American Chemical Society 2015 v.137 no.2 pp. 893-897
energy conversion, nanofibers, solar energy
Controlling self-organization and morphology of chemical architectures is an essential challenge in the search for higher energy-conversion efficiencies in a variety of optoelectronic devices. Here, we report a highly ordered donor/acceptor functional material, which has been obtained using the principle of ionic self-assembly. Initially, an electron donor π-extended tetrathiafulvalene and an electron-acceptor perylene-bisimide were self-organized separately obtaining n- and p-nanofibers at the same scale. These complementary n- and p-nanofibers are endowed with ionic groups with opposite charges on their surfaces. The synergic interactions establish periodic alignments between both nanofibers resulting in a material with alternately segregated donor/acceptor nanodomains. Photoconductivity measurements show values for these n/p-co-assembled materials up to 0.8 cm² V–¹ s–¹, confirming the effectiveness in the design of these heterojunction structures. This easy methodology offers great possibilities to achieve highly ordered n/p-materials for potential applications in different areas such as optoelectonics and photovoltaics.