This work reports on the synthesis, characterization and application as an optical sensor of two new porphyrin complexes namely :(Hexamethylenetetramine)(meso-tetratrifluoromethylphenylporphyrinato) zinc(II) [Zn(TFMPP)(HMTA)] and (Hexamethylenetetramine)(meso-tetra-tert-butylphenylphenylporphyrinato) Zinc(II) [Zn(TtBuPP)(HMTA)]. The chemical structures of these species were defined by 1 HNMR and FT-IR spectroscopic analysis. The optical properties of these πconjugated systems were investigated by UV-visible, absorption and photoluminescence spectroscopy. The UV-visible titrations show that the Soret and Q bands of the new complexes are red-shifted compared to those of the starting material species [Zn(TFMPP)] and [Zn(TtBuPP)] and the association constants (K as ) was found to be depending on the withdrawing-donating effects of the substituents on the phenyls ring of the mesoporphyrins. The electrochemical behavior was also investigated and the optical and electrochemical energy gaps were determinate. The electronic properties of the ITO/Pi/Al have been defined by I-V characteristics and impedance spectroscopy measurements.[a] Dr. (3, 4). Scheme 1. Synthesis of the new porphyrin complexes

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Silicon nanowires (SiNWs), with different ratios, have been elaborated by metal assisted chemical etching (MACE) on P3HT:SiNWs blends, deposited onto PET substrate. X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM) and hotoluminescence (PL) measurements have been used to control the structural, morphological and optical properties of the investigated structure. The best concentration chosen is followed by an annealing treatment. Our results prove that the optimal structure is obtained with the nanocomposite P3HT:SiNWs (1:1). The moderate annealing temperature, around 90 °C, is most appropriate. A correlation between XRD, AFM and PL measurements can explain the decrease of charge transfer and the coupled of SiNWs with increasing concentration. Our results can improve the possibility to integrate those kinds of structures as an active layer in the photovoltaic applications.