Physics

Electron

Nanotechnology

Work (physics)

Relaxation (psychology)

Electron mobility

Semiconductor

Coupling (piping)

Psychology

Metallurgy

Materials science

Phonon

Condensed matter physics

Quantum mechanics

Monolayer

Optoelectronics

Thermoelectric effect

Social psychology

npj Computational Materials

The interactions between electrons and phonons play the key role in determining the carrier transport properties in semiconductors. In this work, comprehensive investigations on full electron–phonon (el–ph) couplings and their influences on carrier mobility and thermoelectric (TE) performances of 2D group IV and V elemental monolayers are performed, and we also analyze the selection rules on el–ph couplings using group theory. For shallow n/p-dopings in Si, Ge, and Sn, ZA/TA/LO phonon modes dominate the intervalley scatterings. Similarly strong intervalley scatterings via ZA/TO phonon modes can be identified for CBM electrons in P, As, and Sb, and for VBM holes, ZA/TA phonon modes dominate intervalley scatterings in P while LA phonons dominate intravalley scatterings in As and Sb. By considering full el–ph couplings, the TE performance for these two series of monolayers are predicted, which seriously downgrades the thermoelectric figures of merits compared with those predicted by the constant relaxation time approximation.

Strong electron–phonon coupling influences carrier transport and thermoelectric performances in group-IV/V elemental monolayers