%0 Journal Article
%T Influence of Photon Pump Fluence on Charge Carriers in FAPbI3 and Manganite Perovskites
%A Nam Joong Jeon
%A Jangwon Seo
%A Sanghee Nah
%A Jung-Keun Lee
%J Advances in Chemical Engineering and Science
%P 54-64
%@ 2160-0406
%D 2022
%I Scientific Research Publishing
%R 10.4236/aces.2022.121005
%X 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:&quot;\"><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;\">&lt;N&gt;</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.
%K FAPbI3
%K Perovskite Manganites
%K Transient Absorption
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=114760