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Single phase ceramics of composition Sr(Ti1- xMg x)O3- x: 0 ≤ x ≤ 0.01 were prepared by sol-gel synthesis and characterized by X-ray diffraction, scanning electron microscopy, impedance spectroscopy, and current-voltage measurements. The bulk and grain-boundary conductivities increase on application of a small dc bias voltage in the range 3-200 V/cm and at temperatures in the range 150°C-800°C. A qualitatively similar increase in conductivity occurs on increasing [ABSTRACT FROM AUTHOR]

Planar diode structures employing hybrid organic-inorganic methylammonium lead iodide perovskites lead to multifunctional devices exhibiting both a high photovoltaic efficiency and good electroluminescence. The electroluminescence strongly improves at higher current density applied using a pulsed driving method [ABSTRACT FROM AUTHOR]

Planar perovskite solar cells using organic charge selective contacts were fabricated. In a vacuum deposited perovskite-based solar cell, dopant and additive free triazatruxene as the hole transport layer was introduced for device fabrication. High open-circuit voltage of 1090 mV was obtained using methylammonium lead iodide ( E g =1.55 eV) as light harvesting material, thus representing a loss of only 460 mV which is in close vicinity of mature silicon technology (400 mV). The devices showed a very competitive photovoltaic performance, monochromatic incident photon-to-electron conversion efficiency of 80% and the power conversion efficiencies in excess of 15% were measured with a negligible degree of hysteresis. [ABSTRACT FROM AUTHOR]