With perovskite solar cells efficiency reaching 25.7%, their stability has become the most significant barrier to commercialization. According to preliminary research, additive engineering can significantly improve the efficiency and stability of solar cells. Shaanxi Normal University's Liu Shengzhong, Wang Dapeng, and Chen Li chose a plant-derived natural green additive of l-theanine to improve the crystal quality of perovskite absorber and the performance of perovskite solar cells (PSC) resistant to ultraviolet.
The O group in Thea can effectively inhibit metal Pb0 precipitation, passivate uncoordinated Pb2+ions, and promote perovskite nucleation and crystallization. Furthermore, the N-H group and hydrogen bond work together to reduce the nonradiative recombination probability of photogenerated carriers, effectively improving the ability to extract carriers from perovskite absorbers.
Li Yong et.al Plant-Derived l-Theanine for Ultraviolet/Ozone Resistant Perovskite Photovoltaics Adv. Energy Mater. 2022
DOI: 10.1002/aenm.202203190
https://doi.org/10.1002/aenm.202203190