Temperature Dependent Characteristics of Perovskite Solar Cells

Abstract

Abstract In this work we report the characterization of perovskite solar cells with mesoscopic TiO 2 /Al 2 O 3 /NiO/carbon architecture by analyzing the dependence of photovoltaic parameters on temperature and illumination intensity. This perovskite device shows impressive power conversion efficiency at room temperature (>14 %) and at low temperature of 80 K (>5 %). This enables unequivocal identification of the contribution of CH 3 NH 3 PbI 3 to construction of the built‐in electric field, and thus, the temperature dependent photovoltaic parameters. The typical feature of this type solar cell is that open‐circuit voltage follows behaviour of the dielectric constant of CH 3 NH 3 PbI 3 . In addition, the dependence of current on light intensity shifts from the space‐charge‐limited to diffusion‐limited mechanisms as increasing temperature. By using the observed significant short‐circuit current density of 12.76 mA cm −2 at 80 K the exciton‐binding energy of CH 3 NH 3 PbI 3 is evaluated to be less 6.9 meV in an operating device, which can be further verified with Elliott's formula.