9:30 AM - 9:45 AM
[15a-A402-3] Long lifetime of hot electrons in TiO2 nanoparticles for high-efficiency charge transfer
Keywords:TiO2 nanoparticles, charge tansfer efficiency, long lifetime hot electrons
The lifetime of hot electrons in metals is as short as 10fs. When the lifetime is only 10 fs, 1 to 2 eV electrons travel less than 10 nm. For transferring electrons over several hundred nm in solar cells, a lifetime longer than several hundred fs is required. Thus, a long lifetime of electrons is crucially important for the high-transfer efficiency of carriers.
We evaluated the lifetime of hot electrons by the pump-probe technique by observing photoemission using PEEM. We found the lifetime of electrons is s long as 1 ps in TiO2 nanoparticles, which is ten times longer than in a TiO2 single crystal. Thus we confirmed that the long lifetime of hot electrons is the secret of high performance of TiO2 nanoparticles.
We evaluated the lifetime of hot electrons by the pump-probe technique by observing photoemission using PEEM. We found the lifetime of electrons is s long as 1 ps in TiO2 nanoparticles, which is ten times longer than in a TiO2 single crystal. Thus we confirmed that the long lifetime of hot electrons is the secret of high performance of TiO2 nanoparticles.