For example, in the genomic computer intra-machine communication occurs by means of diffusion (of transcription factors), while in electronic computers it occurs by electron transit along pre-organized wires.
The decrease of the electron transit time in FETs is achieved mainly by design of short transistors and minimization of scattering in the intrinsic layer of the HEMT channel.
The electron transit time and lifetime in the scattering layer are faster than those in the optical active layer after the influence caused by the conduction band movement is removed.
The first path occurs as low-temperature free-electron transit from the conduction band to the Zni level and then combines with a hole in the oxygen vacancy.
The increased electron lifetime and the reduction of the electron transit time can explain the increment of Jsc by the addition of ATN. Figure 7 DSSCs' intensity-modulated photovoltage spectroscopy results.
However, when the thickness of ZnO layer further increases, the change trend is reverse, and electron transit time for the cell with 20-nm-thick ZnO layer is markedly increased to 4.62 ms.
The increased electron lifetime has verified that ultrathin ZnO layer effectively slows the back recombination of electrons at the interface of FTO/electrolyte, so the decreased electron transit time reveals that the suppression effect is stronger than the potential barrier effect when the ZnO layer thickness is smaller than 20 nm.
Although an energy barrier is induced by introduction of ZnO layer between the TiO2 and FTO, the electron transit time estimated from IMPS measurement is decreased from 1.88 to 1.08 ms for cells with ZnO layer thickness increasing from 0 to 15 nm.
To mitigate this recombination effect it is necessary to ensure that the effective electron lifetime in the DSSC is longer than the electron's transit time across the photoanode of mesoporous TiO2.
