Recently, due to the importance of nanoscience and nanotechnology, biomolecules have gained intensive interests in nanoelectronic applications. Biomolecules have been considered as an alternative electronic component in the so-called molecular electronics. The adsorption of a self-assembled monolayer (SAM) of biomolecules on semiconductors and ferroelectric materials has been considered to modify the transport and the dielectric properties of these materials. The former is based on the controllable and predetermined dipolar property of the biomolecules, which modifies the potential barrier at the SAM/semiconductor interface and consequently the current in the conduction channel in the semiconductor.