Abstract. The recent power-packed advent of perovskite solar cells is transforming photovoltaics (PV) with their superior efficiencies, ease of fabrication, and cost. This perovskite solar cell further boasts of many unexplored features that can further enhance its PV properties and lead to it being branded as a successful commercial product. This article provides a detailed insight of the organometal halide based perovskite structure, its unique stoichiometric design, and its underlying principles for PV applications. The compatibility of various PV layers and its fabrication methods is also discussed.

Pyroelectric and dielectric properties of modified PZT and PZ have been studied for their use in infrared detectors. Various material figure-of-merits for their use in infrared detector are calculated including when the pyroelectric element is placed on heat-sink condition. The results are compared with exiting candidate materials.

This article examines various kinds of chemical sensors, their mechanism of operation and the ways to improve their performance. It reports the results of exploratory investigation of binary composite polycrystalline thick-films such as SnO2-WO3, SnO2-In2O3, and SnO2-ZnO for the detection of volatile organic compound (isopropanol) are reported. It also contains an overview on the status of the new types of metal oxide based nanostructured sensors, such as nano belts, nanorods, nanotubes, nanofibers, nanocomposites, etc.

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Barium-strontium-titanate (Ba0.5Sr0.5)TiO3 thin film capacitors fabricated by a spin-on technique were studied. At room temperature the films have high dielectric constant ε, ranging from 22 to 151 at 1 MHz. Complex impedance spectroscopy was used in order to measure the frequency dependence of their dielectric properties. Cole–Cole reactance versus resistance of experimental data in the frequency range 10 Hz–10 MHz show semicircular behavior indicative of current leakage. The current leakage is proportional to the dielectric constant and in particular the lowest leakage current we measured at 1 MHz was 3×10−5 A/cm2 on samples with ε=22.