Yoctoampere

However, in the IGZO-FET, heavy holes strongly suppress tunneling current, and at most yoctoampere off-state current is estimated which is dominated by thermally excited holes.

First, they are known to show an off-state current on the order of yoctoampere per micron (10⁻²⁴ A/µm) at room temperature (RT).

For example, the off-state current per micrometer of the channel width at 85° C. is less than or equal to 100 yA (1 yA (yoctoampere) is 1×10⁻²⁴ A).