The capability to monitor finely the physical properties of eumelanin, an important class of biopolymers, involved in melanoma cancer pathologies, whose function and intrinsic disorder still collects the interest of many investigators, was achieved by means of electrospray deposition (ESD). By alleviating the problem of the solubility of melanin through the realization of high-quality films it was possible to spread light on the unknown biopolymer supramolecular organization. In fact, on the basis of scanning probe microscopies, electron spectroscopies, and transport properties, it was possible to delineate peculiar features of the melanin organization varying from heteropolymeric to oligomeric in character and eventually turning in a cross-linked secondary molecular structure.

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Three 3,6-di(4-methoxyphenyl)amino N-alkylated carbazoles were synthesized, characterizeda nd incorporated in solid state dye-sensitized solar cells. Devices using these compoundsa ss olid hole conductors showedr elative high V oc thanks to good energy level matching betweent hem and D102 dye. However,t hey yield relativelyl ow J sc and FF compared to spiro-OMeTAD-based control devices, which is due to an order of magnitude lower mobility and conductivity with respect to spiro-OMeTAD. Maximum PCEs for Nethyl and N-hexyl 3,6-di(4-methoxyphenyl)amino carbazoles (2a, 2b) are 1.6 %, and 1.8 %r espectively,w hereas spiro-OMeTAD devices gave 4.4 %. Stability tests in air under continuousillumination have been reported.

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International audienc

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