The integration of semiconductor technology with biological systems has led to the emergence of bioelectronic interfaces capable of interacting directly with human tissues. This paper explores the development of flexible semiconductor materials designed to control and modulate electrical interactions at the biointerface. These advanced materials offer biocompatibility, mechanical adaptability, and electrical performance suitable for applications ranging from neural stimulation to cardiac monitoring. Emphasis is placed on organic semiconductors, nanostructured thin films, and hybrid systems that can conform to soft, dynamic biological surfaces. The paper reviews current fabrication techniques, discusses key design parameters, and highlights biomedical applications where precise electrical modulation is critical. Ultimately, semiconductor-based biointerfaces represent a transformative approach for next-generation medical diagnostics, prosthetics, and tissue regeneration technologies.