摘要
FAPbI</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> and FA(Mn:Pb)I</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> perovskite films were prepared and evaluated</span></span><span style="font-family:""><span style="font-family:Verdana;"> through steady and transient absorption spectroscopy. According to the analysis using Elliot’s model, there were no considerable differences except for the absorption intensity between FAPbI</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> and FA(Mn:Pb)I</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> perovskite films: the value of the optical gap (</span><i><span style="font-family:Verdana;">E</span><sub><span style="font-family:Verdana;">g</span></sub></i><span style="font-family:Verdana;">) and the position of exciton resonance (</span><i><span style="font-family:Verdana;">E</span><sub><span style="font-family:Verdana;">0</span></sub></i><span style="font-family:Verdana;">) were the same. </span><span style="font-family:Verdana;">The femtosecond transient absorption showed biexponential relaxation</span><span style="font-family:Verdana;"> properties of the charge carriers, suggesting that biexcitons are more easily generated in FA(Mn:Pb)I</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> than FAPbI</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> perovskite. The generation of biexcitons in FA(Mn:Pb)I</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> was also confirmed by the photon pump fluence dependence. Moreover, we were able to estimate the average number of absorbed photons </span><i><span style="font-family:Verdana;"><N></span></i><span style="font-family:Verdana;"> directly from the photon pump power dependence without needing any further experimental measurements such as photoluminescence. Our findings may offer a new way of understanding photoinduced carrier dynamics in perovskite manganites.
FAPbI</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> and FA(Mn:Pb)I</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> perovskite films were prepared and evaluated</span></span><span style="font-family:""><span style="font-family:Verdana;"> through steady and transient absorption spectroscopy. According to the analysis using Elliot’s model, there were no considerable differences except for the absorption intensity between FAPbI</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> and FA(Mn:Pb)I</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> perovskite films: the value of the optical gap (</span><i><span style="font-family:Verdana;">E</span><sub><span style="font-family:Verdana;">g</span></sub></i><span style="font-family:Verdana;">) and the position of exciton resonance (</span><i><span style="font-family:Verdana;">E</span><sub><span style="font-family:Verdana;">0</span></sub></i><span style="font-family:Verdana;">) were the same. </span><span style="font-family:Verdana;">The femtosecond transient absorption showed biexponential relaxation</span><span style="font-family:Verdana;"> properties of the charge carriers, suggesting that biexcitons are more easily generated in FA(Mn:Pb)I</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> than FAPbI</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> perovskite. The generation of biexcitons in FA(Mn:Pb)I</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> was also confirmed by the photon pump fluence dependence. Moreover, we were able to estimate the average number of absorbed photons </span><i><span style="font-family:Verdana;"><N></span></i><span style="font-family:Verdana;"> directly from the photon pump power dependence without needing any further experimental measurements such as photoluminescence. Our findings may offer a new way of understanding photoinduced carrier dynamics in perovskite manganites.
作者
Nam Joong Jeon
Jangwon Seo
Sanghee Nah
Jung-Keun Lee
Nam Joong Jeon;Jangwon Seo;Sanghee Nah;Jung-Keun Lee(Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon, Korea;Seoul Center, Korea Basic Science Institute, Seoul, Korea;Physics Department, Division of Liberal Arts and Sciences, Hanil University & PTS, Wanju, Korea)
