For the first time solid-state zinc ion hybrid supercapacitors based on co-polymer derived hollow carbon spheres with good flexibility have been developed.

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Nano-fiber structure of ZnO and Ni doped ZnO (Ni:ZnO) transparent thin films have been deposited on glass substrate at 350 C at an ambient atmosphere via spray pyrolysis technique. The structural, surface morphological and opto-electrical properties of ZnO and Ni doped ZnO thin films have been investigated. The XRD patterns show that the films are of polycrystalline in nature having preferential orientation (0 0 2) plane for ZnO changes to (1 0 1) by Ni doping in ZnO matrix. Optical study exhibits red shifting in band gap energy with Ni doping due to spd hybridization and display high absorption coefficient of the order of 10 7 m À1 . The photoluminescence (PL) spectra indicate blue emissions in all samples. Electrical measurement confirms the resistivity of the film decreases remarkably with Ni doping and electrical transport is mainly thermally activated. From Hall Effect study, it is confirmed that all the samples are n-type having carrier concentration of the order of 10 18 cm À3 . Both mobility and carrier concentrations of the films became higher than ZnO sample with the increase of Ni concentration.

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We investigate the low-cost, earth-abundant and air-stable inorganic absorber Sb2S3 that can be processed in the air for organic–inorganic hybrid solar cell applications.

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