Beijing Institute of Technology Develops 1T' Monolayer Heptanary Medium-Entropy Alloy for Infrared Photodetectors

Researchers at the Beijing Institute of Technology have synthesized a 1T' monolayer heptanary medium-entropy alloy using a single-step chemical vapor deposition process. The alloy, composed of molybdenum, tungsten, iron, cobalt, sulfur, selenium, and tellurium, demonstrates significant improvements in conductance and responsivity, with values reaching 27.92 A/W at 1064 nm and 63.74 A/W at 1550 nm.

This innovation leverages configurational entropy to optimize charge transport and mitigate lattice distortion, enhancing infrared detection capabilities. The study published in Nano Research on March 26, 2025, also highlights the reduced Schottky barrier height, allowing for better charge injection and efficiency. The implications of this research extend to telecommunications, medical diagnostics, and flexible electronics, indicating a shift toward advanced material designs that could meet growing technological demands.