B2S3 monolayer: a two-dimensional direct-gap semiconductor with tunable band-gap and high carrier mobility

Atomically two-dimensional materials with direct band-gap and high carrier mobility are highly desirable due to their promising applications in electronic devices. Here, on the basis of ab initio calculations and global particle-swarm optimization method, we predict the B2S3 monolayer as a new semiconductor with favorable functional properties. The B2S3 monolayer possesses a high electron mobility of 553 cm(2) V-1 s(-1) and a direct band-gap of 1.85 eV. The direct band-gap can be manipulated under biaxial strain. Furthermore, B2S3 monolayer can absorb sunlight efficiently in the entire range of the visible light spectrum. Besides, this monolayer holds good dynamical, thermal, and mechanical stabilities. All the desired properties render B2S3 monolayer a promising candidate for future applications in high-speed (opto)electronic devices.

Automated summary

The B2S3 monolayer, predicted through ab initio calculations and global particle-swarm optimization method, is a new semiconductor with high electron mobility and a direct band-gap that can be manipulated under biaxial strain. It can efficiently absorb sunlight in the visible light spectrum and holds good dynamical, thermal, and mechanical stabilities, making it a promising candidate for future applications in high-speed (opto)electronic devices.