2nm Carrier Transfer Length Found in MoS2 Transistors

Researchers have measured a 2 nanometer (nm) carrier transfer length in bismuth-contacted monolayer molybdenum disulfide (MoS2) transistors. This measurement, detailed in a study published online on July 1, 2026, in the journal Nature, establishes a critical scaling limit for sub-10 nm two-dimensional (2D) electronic devices. The findings were obtained using cross-sectional scanning tunneling microscopy.

The carrier transfer length is a fundamental parameter in semiconductor devices, indicating how far charge carriers can travel before recombining or scattering. A shorter transfer length implies that contacts must be placed closer to the active channel region to ensure efficient charge transport. For 2D materials, which are inherently thin, achieving efficient electrical contact is a significant challenge for miniaturization.

This specific measurement of 2 nm in MoS2 transistors with bismuth contacts provides a concrete benchmark for the design and fabrication of next-generation electronic components. It suggests that for future devices operating below 10 nm feature sizes, the interface between the metal contact and the 2D semiconductor material will be paramount. Optimizing this interface is crucial to overcome performance limitations imposed by short carrier transfer lengths.

The study's implications extend to the development of smaller, faster, and more power-efficient electronic devices. As the semiconductor industry pushes towards ever-smaller scales, understanding and controlling carrier transport at the nanoscale becomes increasingly vital. The Nature publication, with its doi:10.1038/s41586-026-10707-0, offers a verifiable data point for the scientific community working on advanced materials and device physics.