Mid-infrared absorption in self-assembled Ge quantum dots grown on Si substrate

Wen-Gang Wu; Jian-Lin Liu; Gaolong Jin; Kang Lung Wang

doi:10.1117/12.342780

19 March 1999 Mid-infrared absorption in self-assembled Ge quantum dots grown on Si substrate

Wen-Gang Wu, Jian-Lin Liu, Gaolong Jin, Kang Lung Wang

Proceedings Volume 3630, Silicon-based Optoelectronics; (1999) https://doi.org/10.1117/12.342780
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

Mid-infrared absorption in boron-doped and modulation boron- doped self-assembled Ge quantum dots grown on (001) oriented Si substrates is reported for the first time in this paper. The structures, which were grown by a solid source molecular beam epitaxy system, are composed of 20 or 30 periods of Ge dot layers and Si spacer films. The structural properties of the multilayers and some uncapped Ge dots on sample surface were tested by cross-sectional transmission electron and atomic force microscopes, respectively. Through use of Fourier transform infrared and Raman spectrometers, infrared absorption signals peaking in the mid-infrared range were observed. The absorption is strongly polarized along the growth axis of the samples. Experimental and theoretical analysis suggests that the mid-infrared response be attributed to intraband transitions in the valence band of the Ge quantum dots. This study demonstrates the application potential of these kinds of Ge/Si quantum dot multilayer structures for developing mid-infrared photodetectors.

Citation Download Citation

Wen-Gang Wu, Jian-Lin Liu, Gaolong Jin, and Kang Lung Wang "Mid-infrared absorption in self-assembled Ge quantum dots grown on Si substrate", Proc. SPIE 3630, Silicon-based Optoelectronics, (19 March 1999); https://doi.org/10.1117/12.342780

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