The time it takes for a valence electron in silicon to be excited to the conduction band is not instantaneous and involves a measurable duration. Transitions between electronic states in molecules typically occur on the order of 1 femtosecond (1 fs or 1x10-15 seconds). Recent advancements in molecular spectroscopy have demonstrated electron density motion post-excitation with pulses as short as 0.1 fs. These findings highlight the rapid dynamics of electron transitions in semiconductor materials.
PREREQUISITESPhysicists, materials scientists, and researchers in semiconductor technology who are interested in the dynamics of electron transitions and their implications in electronic and optical applications.
zhterran said:We know in silicon a valence electron can be excited to conduction band if it absorbs one photon(one photon absorption) or two photon(two photon absorption),my question is that it must need a certain amount of time for the electron to 'travel' from the valence band to the conduction band(I cannot imagin a instantaneously transition with zero time),then how long is that time?