Humidity Sensing Properties of Organometallic Perovskite CH3NH3PbI3

It is known that the photovoltaic properties of organic perovskite based solar cells decline at high humidity that is one of the perovskite solar cells disadvantages. We investigated the effect of humidity on the perovskite CH3NH3PbI3 conductivity that can be applied to creation of cheap and effective humidity sensors. The measurements have shown that perovskite CH3NH3PbI3 has a competitively high sensitivity to humidity. The mechanisms that lead to a change in the perovskite conductivity in a humid environment are proposed. The produced organic perovskite CH3NH3PbI3 showed the high and reversible sensor response to humidity at room temperature. The production of CH3NH3PbI3 is cheap and scalable, so the using of organic perovskite in humidity sensors will reduce the price of its. The dependence of CH3NH3PbI3 conductivity on relative humidity was investigated and mechanisms of conductivity change were proposed.