Picosecond electro-optic sampling of electron-hole vertical transport in surface space charge fields

✍ Scribed by L. Min; R.J.Dwayne Miller

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 527 KB
• Volume: 163
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(89)80010-7

✦ Synopsis

The longitudinal electrc+optic effect in GaAs( 100) is used to measure the dynamics of electron-hole pair separation in surface space charge fields present at GaAs/ox_ide interfaces. At low photocarrier injection, the rise time in the Efield transient is a direct measurement of the charge transport across the space charge field which is found to be faster than 500 fs. The results demonstrate that the charge carriers are energetically unthermalized at the surface prior to the surface chemistry. This method is also found to be sensitive to 10-s of a monolayer of charged surface states.