impact ionization

in a semiconductor
https://doi.org/10.1351/goldbook.08831
Charge carrier generation by another charge carrier possessing a high kinetic energy, which knocks an electron out of the HOMO into the LUMO or still higher state so creating a new electron-hole pair.
Source:
PAC, 2022, 94, 15. (Glossary of terms relating to electronic, photonic and magnetic properties of polymers (IUPAC Recommendations 2021)) on page 36 [Terms] [Paper]