Perovskite solar cells integrated with blue cut-off filters for mitigating light-induced degradation

Abstract

The stability of methylammonium (MA)-based perovskite solar cells (PSCs) remains one of the most urgent issues that need to be addressed. Inherent weak binding forces between MAs and halides cause the perovskite structure to become unstable under exposure to various external environmental factors such as moisture, oxygen, ultraviolet radiation, and heat. In particular, the degradation of perovskite films under light exposure accelerates the deterioration of the device, mainly due to the migration of halide ions. In this study, we investigated the effect of light energy on the degradation of inverted PSCs by introducing red ( = 610–800 nm), green (500–590 nm), and blue (300–500 nm) light-pass filters. After 30 h, the inverted PSCs of blue-light-induced devices retained a power conversion efficiency (PCE) of 70%, while those of the green and red light-induced devices retained PCEs of 85% and 90%, respectively. Direct evidence of light-induced degradation was obtained by investigating morphological changes in the perovskite films and the amount of ion accumulation on the Ag electrode. This evidence highlights the varying effect of light with different energies on device degradation. Furthermore, to minimize light-induced device degradation, we designed two types of blue cut-off filters that can selectively block light ranging from = 400 to 500 nm, comprising a multilayered inorganic metasurface. An optical simulation was used to optimize the performance of the designed filters. By investigating the changes in the photovoltaic parameters and the amount of ion accumulation on the Ag electrode, we confirmed that integrating blue cut-off filters into PSCs greatly improved the operational lifetime of the devices.

Recent Advances in UV-Cured Encapsulation for Stable and Durable Perovskite Solar Cell Devices

“…Yoon et al designed a blue cut-off filter that selectively blocked blue light with wavelengths below 500 nm. This was achieved by constructing a multilayered inorganic metasurface consisting of TiO2 and SiO2 layers and applying it to a PSCs [108]. Another approach is to combine desiccants with epoxy resins.…”

Room temperature processed protective layer for printed silver electrodes

“…However, these layers require a hightemperature annealing process and strong UV irradiation, which might threaten the substrate, semiconducting polymer, and silver electrodes. 25,26 As a result, a new type of lowtemperature and simply processed polymer protective layer, stable to chemicals, will be more benecial for improving the reliability of devices with printed electrodes.…”