Sharif Digital Repository

Barium Strontium Titanate (BST) thin films are a promising candidate for dielectric capacitors due to their excellent ferroelectric properties. It is well known that BST has a high dielectric constant, low loss tangent, low leakage current and low Curie temperature. Pulse laser deposition (PLD) has been used extensively as it can maintain the stoichiometry of the target in the deposited film and also has high coverage ability, which both are important in capacitors. In this paper, Ba0.6Sr0.4TiO3 (BST) thin film has been deposited on the SiO2/Si substrate by pulsed laser deposition technique. The effect of post-annealed temperature, oxygen pressure deposition ambience and number of pulses on... 

In this work, polyvinylidene difluoride (PVDF) as a ferroelectric polymer, polyaniline (PANI) and polypyrrole (PPy) as conductive polymer additives are used to fabricate high performance mesoporous CH3NH3PbI3-xClx mixed-halide perovskite solar cells in a sequential deposition method. Using polymer additives in perovskite precursor solution leads to modification of perovskite layer morphology by changing nucleation and growth of perovskite grains. Besides, conductive polymer additives in perovskite layer help to more charge carrier transfer. Power conversion efficiency has been enhanced from 10.40 % to 16.51% and to 13.21 % in ambient atmosphere in the presence of 1.0 wt. % of PVDF and PPy...