Perovskite solutions with added potassium iodide (KI) and ethylammonium bromide (EABr) were used to fabricate perovskite solar cells in ordinary air at 190 °C. The addition of EABr KI induced (100)-oriented crystals, which resulted the improvement short-circuit current densities conversion efficiencies. density, open circuit voltage, efficiency best device 21.0 mA cm−2, 0.942 V, 12.88%, respect...

abstract: Ascorbic acid (Vitamin C) is an essential Vitamin which participates in many different biological processes. The ascorbic acid content in vegetables and fruits is a maturity index and its determination in such samples is of special interest in quality control. In this paper we present a titrimetric method with potassium bromide for the determination of ascorbic acid in walnut, cabbage...