Stable Perovskite Solar Cell Architectures: Robustness against Temperature Variations Under Real World Conditions

Perovskite solar cells (PSCs) are one of the most promising emerging photovoltaic technologies, demonstrating high efficiencies and low fabrication costs. This work reports on the stability of high-efficient PSCs stressed with realistic temperature variations. The photocurrent is found to reversibly decline below 20% of the initial value in the most common device architecture based on a TiO2 electron transport layer, upon cycling the temperature between 10 degrees C and 60 degrees C. In contrast, the photocurrent stabilizes for constant temperatures. The degradation can be prevented by replacing the electron transport layer with more stable materials. Finally, the impact of this degradation for outdoor application is shown by stressing PSCs with a real outdoor temperature profile.