A. Electric Field (E)
Fig. 2 shows the built-in electrical field (E) distribution of
the BSWCNT-based power diode. The maximum value of the
electrical field distribution is 3.6 x 107 Vim as can be
observed from Fig. 2. This electrical field (E) value is higher
than it is in conventional power diode made from silicon with
comparable dimensions. When the BSWCNTs semiconductor
is in the forward mode, significant number of electrons is
created in the conduction band and significant number of holes
(positive-charge carriers) is created in the valence band due to
the multiplying effect of the CNTs. Thus, in principle, the
built-in electric field can pull the generated electrons to the
negative-electrode and holes to the positive-electrode, thereby increasing the efficiency of the device. BSWCNT-based
power diode has higher reverse voltage breakdown than
silicon-based power diode because the electric field is strong
enough to separate the bound charges. This is due to the fact
that in nano-particles, the surface area of the particle is larger
when compared to its volume (more surface atoms than inside
atoms) [19]-[30]. Moreover, the linear geometry of the CNTs
enables faster charge removal during the off-cycle [27]-[32].