规避逆同位素效应并协同调节钙钛矿硬度与提升热稳定性OA

Perovskite materials show broad prospects in the field of new photovoltaic devices and high-performance photodetectors due to their excellent photoelectric conversion efficiency and adjustable band gap characteristics.However,perovskite has the problem of insufficient long-term stability under actual working conditions,which seriously restricts its large-scale commercial application.To address this critical bottleneck,this study proposed a molecular engineering strategy based on methyl deuteration(—CD3),which selectively replaced the hydrogen atoms on the methyl terminus of organic cations(CH3NH3+)in perovskites with deuterium(D)isotopes.This approach systemically enhances material stability without significantly altering the electronic structure of the material.Compared with the traditional deuteration treatment of the ammonium(—NH3)site,the methyl deuteration strategy effectively avoids the inverse isotope effect that may arise from quantum tunneling effect of N-D bonds,thereby precluding the risk of potential stability decline.This study reveales that the introduction of deuterium atoms enables the modulation of material hardness and enhances its thermal stability.At the level of carrier dynamics,deuteration effectively suppresses the dynamic disorder of the crystal,thereby significantly enhancing the carrier lifetime of the material.