Terahertz spectroscopy provides real-time insight into perovskite aging
Hybrid perovskites are promising materials for advanced electronic devices such as solar cells and LEDs. However, their limited lifespan poses a significant challenge for commercial deployment. As these materials age, their performance deteriorates, creating obstacles for researchers and manufacturers alike. Addressing this problem requires not only improving the stability of perovskites, but also developing techniques to monitor their aging process in real time, which is crucial for improving their durability and efficiency.
A recent study led by Prof. Yiwen Sun at Shenzhen University has introduced a new approach to observing the aging process of perovskites using terahertz time-domain spectroscopy. This method is based on the resonant absorption of terahertz waves by phonons in the perovskite structure. During aging, the intensity of the phonon vibration modes associated with the Pb-I bonds decreases, which in turn affects the absorption peaks of terahertz waves at specific frequencies. The research team proposed that these changes in terahertz absorption peaks could serve as a real-time indicator of the aging status of the perovskites.
These findings are important because they provide a practical method to monitor the aging process of perovskites in real time. These advances have the potential to accelerate the commercialization of perovskite-based devices, improving their reliability and efficiency for widespread use.
The study, titled “Real-time detection of aging status of methylammonium lead iodide perovskite thin films using terahertz time-domain spectroscopy,” was published on July 29, 2024 in ‘Frontiers of Optoelectronics’.
Research report:Real-time detection of the aging status of methylammonium lead iodide perovskite thin films using terahertz time domain spectroscopy
