Optical pump-terahertz probe investigation of carrier relaxation in radiation-damaged silicon-on-sapphire

Frank A. Hegmann; Kristine P.H. Lui

doi:10.1117/12.470433

11 June 2002 Optical pump-terahertz probe investigation of carrier relaxation in radiation-damaged silicon-on-sapphire

Frank A. Hegmann, Kristine P.H. Lui

Proceedings Volume 4643, Ultrafast Phenomena in Semiconductors VI; (2002) https://doi.org/10.1117/12.470433
Event: Symposium on Integrated Optoelectronic Devices, 2002, San Jose, California, United States

Abstract

We use an optical pump - terahertz probe technique to study relaxation dynamics of photoexcited carriers in semiconductors. The optical pump pulse (400/800 nm, 100 fs) from an amplified Ti:sapphire laser generates free carriers within the optical penetration depth of the semiconductor surface, and the transmission of the terahertz (THz) probe pulse is monitored as a function of delay time between pump and probe. In particular, we investigate carrier relaxation dynamics in radiation-damaged silicon-on-sapphire (RD-SOS). We measure pump-induced changes in the transmission of the amplitude of the THz pulse, which proves to be a valid technique for these low-mobility samples due to negligible phase shifts in the transmitted THz pulse. Using a simple thin-film Drude model, single-exponential relaxation times of 4 to 6 ps are observed and transient mobilities of about 420 cm²/Vs are obtained for moderately damaged RD-SOS> Picosecond carrier relaxation dynamics in high-implant-dose RD-SOS and sub-picosecond transients in amorphous silicon thin films are also observed.

Citation Download Citation

Frank A. Hegmann and Kristine P.H. Lui "Optical pump-terahertz probe investigation of carrier relaxation in radiation-damaged silicon-on-sapphire", Proc. SPIE 4643, Ultrafast Phenomena in Semiconductors VI, (11 June 2002); https://doi.org/10.1117/12.470433

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available