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Summary Photoanodes of TiO2 and Nickel (Ni) doped TiO2 nanoparticles (Ni‐TiO2 NPs) were prepared by Bio‐assisted synthesis technique using the extract of grapefruit as solvent/reducing agent. From XRD and Raman analysis the anatase phase of the prepared TiO2 NPs and Ni‐TiO2 NPs were confirmed. The morphology of the prepared NPs was analyzed using FESEM analysis, from the analysis nanorods and spherical shaped structures were observed for TiO2 and Ni‐TiO2, respectively. The optical properties of the synthesized TiO2 and Ni‐TiO2 NPs have been studied by UV‐Vis spectroscopy and the absorption in the visible region was observed for the Ni doped TiO2 samples. Using the prepared TiO2 and Ni‐TiO2 NPs as photo anodes DSSCs were constructed and its performance was examined. In this study, two different kinds of dyes were used as sensitizers such as natural dye and commercial dye (N719). The natural sensitizers are extracted from the murrayakoenigii fruit (MKF) skin. The nickel doped TiO2 nanoparticle showed an efficiency (η) of 2.25% for MKF dye and 5.08% for N719 with 0.05 M of nickel doping.

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Infrared absorption on GaAs doped with the isotopes of silicon under hydrogen or deuterium plasma treatment has shown the presence of two new localized modes, all in the range of 625–1725 cm-1. We present a simple nine-atom molecular model to compute these defect modes by assuming the hydrogen or deuterium to be bound in the antibonding position of the substituted Si atom, resulting in a defect complex of C3V symmetry. The two new vibrational modes of the paired Si are found with a small isotope shift, when H is replaced by D. Group theoretical methods are employed for the precise identification of the localized modes.