| 초록 |
Perovskite solar cells (PSCs) have attained power conversion efficiencies of 24.2%. However, a critical issue about their poor long-term stability must be resolved for commercialization. PSCs exhibit fast degradation under oxygen atmosphere and illumination. In this research, we studied the degradation mechanism of a mp-TiO2 based PSCs under oxygen and light illumination with time-of-flight secondary ion mass spectrometry, which can induce iodine migration into the hole transport material (HTM). To enhance the stability against oxygen under light, we introduced Al2O3 NPs as diffusion barrier at the HTM/perovskite interface and encapsulated the device with lamination of face-sealing adhesive sheets. As a result, the long-term stability of mp-TiO2 based PSCs is achieved by isolating devices from oxygen and humidity. In particular, a mp-TiO2 based PSC with a encapsulation retains 20% efficiency after 1000 h under 1 sun AM1.5G illumination of a xenon Lamp including UV in ambient air. |
