Abstract: The transfer matrix and transmission coefficient of electron tunneling through a quantum system consisting of N rectangular barriers and wells and the number of wells on electron resonant tunneling are studied in multi-quantum-well systems. Numerical analysis shows that for the symmetrical multi-quantum-well systems in which the widths of middle barriers are equal to the sum of the widths of two side barriers, the resonant energy is decreased and the number of the resonant peaks is increased with the increase in widths of the wells; the number of the resonant peaks and the resonant energy do not change and the transmission ratio of peak to vale is increased with the increase in the number of the wells.

Key words: resonant tunneling, quantum well, transfer matrix, transmission coefficient