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Tetrapod-shaped CdSe(core)/CdTe(arms) colloidal nanocrystals, capped with alkylphosphonic acids or pyridine, were reacted with various small molecules (acetic acid, hydrazine and chlorosilane) which induced their tip-to-tip assembly into soluble networks. These networks were subsequently processed into films by drop casting and their photoconductive properties were studied. We observed that films prepared from tetrapods coated with phosphonic acids were not photoconductive, but tip-to-tip networks of the same tetrapods exhibited appreciable photocurrents. On the other hand, films prepared from tetrapods coated with pyridine instead of phosphonic acids were already highly photoconductive even if the nanocrystals were not joined tip-to-tip. Based on the current–voltage behavior under light we infer that the tunneling between tetrapods is the dominant charge transport mechanism. In all the samples …
Royal Society of Chemistry
Publication date: 
1 Jan 2010

Isabella R Franchini, Adriano Cola, Aurora Rizzo, Rosanna Mastria, Anna Persano, Roman Krahne, Alessandro Genovese, Andrea Falqui, Dmitry Baranov, Giuseppe Gigli, Liberato Manna

Biblio References: 
Volume: 2 Issue: 10 Pages: 2171-2179