FAMn:PbI<sub>3</sub> perovskite films were synthesized and probed mainly through electron spin resonance (ESR) spectroscopy. FAMn:PbI<sub>3</sub> with low (~1%) Mn concentration showed a hyperf...FAMn:PbI<sub>3</sub> perovskite films were synthesized and probed mainly through electron spin resonance (ESR) spectroscopy. FAMn:PbI<sub>3</sub> with low (~1%) Mn concentration showed a hyperfine sextet line originated from Mn<sup>++</sup> ions. FAMn:PbI<sub>3</sub> with high (10%) Mn concentration showed broad resonance (~500 G peak-to-peak linewidth). However, after bombardment of FAMn:PbI<sub>3</sub> with high Mn concentration by focused ion beams (FIB), a sharp ESR peak appeared. The peak-to-peak linewidth (ΔH<sub>pp</sub>) was ~8 G regardless of the temperature. The FIB-induced defect showed Curie behavior at low temperatures (5 K - 50 K), which indicates the presence of localized electrons at the defect sites at low temperatures. The g-value increased from g = 2.0002 to 2.0016 as the temperature increased from 5 K to 50 K. Together with the ongoing search for electron spin echo (ESE), this could potentially provide a platform for realizing magnetic bits, information storage, and increased manipulation speed.展开更多
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="...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.展开更多
文摘FAMn:PbI<sub>3</sub> perovskite films were synthesized and probed mainly through electron spin resonance (ESR) spectroscopy. FAMn:PbI<sub>3</sub> with low (~1%) Mn concentration showed a hyperfine sextet line originated from Mn<sup>++</sup> ions. FAMn:PbI<sub>3</sub> with high (10%) Mn concentration showed broad resonance (~500 G peak-to-peak linewidth). However, after bombardment of FAMn:PbI<sub>3</sub> with high Mn concentration by focused ion beams (FIB), a sharp ESR peak appeared. The peak-to-peak linewidth (ΔH<sub>pp</sub>) was ~8 G regardless of the temperature. The FIB-induced defect showed Curie behavior at low temperatures (5 K - 50 K), which indicates the presence of localized electrons at the defect sites at low temperatures. The g-value increased from g = 2.0002 to 2.0016 as the temperature increased from 5 K to 50 K. Together with the ongoing search for electron spin echo (ESE), this could potentially provide a platform for realizing magnetic bits, information storage, and increased manipulation speed.
文摘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.
